From 5e4d636d7de3ee2cd6037e82f733950dda88a8b5 Mon Sep 17 00:00:00 2001
From: Andrey Kutejko <andy128k@gmail.com>
Date: Sun, 10 Mar 2019 18:01:08 +0100
Subject: [PATCH] add collection tools for PHP 5.6

---
 composer.json        |  12 +-
 composer.lock        | 366 ++++++++++++++++++++++++++++---------------
 src/collection.php   |  27 ++++
 t/CollectionTest.php |  41 ++++-
 4 files changed, 321 insertions(+), 125 deletions(-)

diff --git a/composer.json b/composer.json
index be6a69e..184f8f5 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,14 @@
       "type": "composer",
       "url": "http://packages.andy128k.net/php/"
     }
-  ]
+  ],
+  "config": {
+    "secure-http": false,
+    "platform": {
+      "php": "5.6.4"
+    }
+  },
+  "scripts": {
+    "test": "phpunit ./t"
+  }
 }
-
diff --git a/composer.lock b/composer.lock
index 6240686..77ac1f6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "hash": "fd1c8f0ed623184574d23b2dfe99216b",
+    "content-hash": "8a90404e7ab5a3257409a757dd322d7b",
     "packages": [
         {
             "name": "andy128k/pegp",
@@ -38,22 +38,22 @@
                 }
             ],
             "description": "PEG",
-            "time": "2015-01-11 10:39:21"
+            "time": "2015-01-11T10:39:21+00:00"
         }
     ],
     "packages-dev": [
         {
             "name": "doctrine/instantiator",
-            "version": "1.0.4",
+            "version": "1.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/instantiator.git",
-                "reference": "f976e5de371104877ebc89bd8fecb0019ed9c119"
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/f976e5de371104877ebc89bd8fecb0019ed9c119",
-                "reference": "f976e5de371104877ebc89bd8fecb0019ed9c119",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/8e884e78f9f0eb1329e445619e04456e64d8051d",
+                "reference": "8e884e78f9f0eb1329e445619e04456e64d8051d",
                 "shasum": ""
             },
             "require": {
@@ -64,7 +64,7 @@
                 "ext-pdo": "*",
                 "ext-phar": "*",
                 "phpunit/phpunit": "~4.0",
-                "squizlabs/php_codesniffer": "2.0.*@ALPHA"
+                "squizlabs/php_codesniffer": "~2.0"
             },
             "type": "library",
             "extra": {
@@ -73,8 +73,8 @@
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Doctrine\\Instantiator\\": "src"
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -94,20 +94,20 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2014-10-13 12:58:55"
+            "time": "2015-06-14T21:17:01+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "2.0.14",
+            "version": "2.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "ca158276c1200cc27f5409a5e338486bc0b4fc94"
+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/ca158276c1200cc27f5409a5e338486bc0b4fc94",
-                "reference": "ca158276c1200cc27f5409a5e338486bc0b4fc94",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/eabf68b476ac7d0f73793aada060f1c1a9bf8979",
+                "reference": "eabf68b476ac7d0f73793aada060f1c1a9bf8979",
                 "shasum": ""
             },
             "require": {
@@ -115,12 +115,12 @@
                 "phpunit/php-file-iterator": "~1.3",
                 "phpunit/php-text-template": "~1.2",
                 "phpunit/php-token-stream": "~1.3",
-                "sebastian/environment": "~1.0",
+                "sebastian/environment": "^1.3.2",
                 "sebastian/version": "~1.0"
             },
             "require-dev": {
                 "ext-xdebug": ">=2.1.4",
-                "phpunit/phpunit": "~4.1"
+                "phpunit/phpunit": "~4"
             },
             "suggest": {
                 "ext-dom": "*",
@@ -130,7 +130,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "2.2.x-dev"
                 }
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             "autoload": {
@@ -139,9 +139,6 @@
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
-            "include-path": [
-                ""
-            ],
             "license": [
                 "BSD-3-Clause"
             ],
@@ -159,7 +156,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2014-12-26 13:28:33"
+            "time": "2015-10-06T15:47:00+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -204,20 +201,20 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2013-10-10 15:34:57"
+            "time": "2013-10-10T15:34:57+00:00"
         },
         {
             "name": "phpunit/php-text-template",
-            "version": "1.2.0",
+            "version": "1.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-text-template.git",
-                "reference": "206dfefc0ffe9cebf65c413e3d0e809c82fbf00a"
+                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686"
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             "dist": {
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-                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/206dfefc0ffe9cebf65c413e3d0e809c82fbf00a",
-                "reference": "206dfefc0ffe9cebf65c413e3d0e809c82fbf00a",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-text-template/zipball/31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
+                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
                 "shasum": ""
             },
             "require": {
@@ -226,20 +223,17 @@
             "type": "library",
             "autoload": {
                 "classmap": [
-                    "Text/"
+                    "src/"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
-            "include-path": [
-                ""
-            ],
             "license": [
                 "BSD-3-Clause"
             ],
             "authors": [
                 {
                     "name": "Sebastian Bergmann",
-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
                     "role": "lead"
                 }
             ],
@@ -248,35 +242,40 @@
             "keywords": [
                 "template"
             ],
-            "time": "2014-01-30 17:20:04"
+            "time": "2015-06-21T13:50:34+00:00"
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.5",
+            "version": "1.0.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "19689d4354b295ee3d8c54b4f42c3efb69cbc17c"
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
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-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/19689d4354b295ee3d8c54b4f42c3efb69cbc17c",
-                "reference": "19689d4354b295ee3d8c54b4f42c3efb69cbc17c",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
-                    "PHP/"
+                    "src/"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
-            "include-path": [
-                ""
-            ],
             "license": [
                 "BSD-3-Clause"
             ],
@@ -292,20 +291,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2013-08-02 07:42:54"
+            "time": "2017-02-26T11:10:40+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "1.3.0",
+            "version": "1.4.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "f8d5d08c56de5cfd592b3340424a81733259a876"
+                "reference": "1ce90ba27c42e4e44e6d8458241466380b51fa16"
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-                "reference": "f8d5d08c56de5cfd592b3340424a81733259a876",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/1ce90ba27c42e4e44e6d8458241466380b51fa16",
+                "reference": "1ce90ba27c42e4e44e6d8458241466380b51fa16",
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@@ -318,7 +317,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.3-dev"
+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
@@ -341,20 +340,20 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2014-08-31 06:12:13"
+            "time": "2017-12-04T08:55:13+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "4.4.1",
+            "version": "4.4.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "6a5e49a86ce5e33b8d0657abe145057fc513543a"
+                "reference": "2e8580deebb7d1ac92ac878595e6bffe01069c2a"
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             "dist": {
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-                "reference": "6a5e49a86ce5e33b8d0657abe145057fc513543a",
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+                "reference": "2e8580deebb7d1ac92ac878595e6bffe01069c2a",
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@@ -372,8 +371,9 @@
                 "sebastian/comparator": "~1.0",
                 "sebastian/diff": "~1.1",
                 "sebastian/environment": "~1.1",
-                "sebastian/exporter": "~1.0",
+                "sebastian/exporter": "~1.1",
                 "sebastian/global-state": "~1.0",
+                "sebastian/recursion-context": "~1.0",
                 "sebastian/version": "~1.0",
                 "symfony/yaml": "~2.0"
             },
@@ -412,29 +412,30 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2014-12-28 07:57:05"
+            "time": "2015-01-27T16:06:15+00:00"
         },
         {
             "name": "phpunit/phpunit-mock-objects",
-            "version": "2.3.0",
+            "version": "2.3.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit-mock-objects.git",
-                "reference": "c63d2367247365f688544f0d500af90a11a44c65"
+                "reference": "ac8e7a3db35738d56ee9a76e78a4e03d97628983"
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-                "reference": "c63d2367247365f688544f0d500af90a11a44c65",
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+                "reference": "ac8e7a3db35738d56ee9a76e78a4e03d97628983",
                 "shasum": ""
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             "require": {
-                "doctrine/instantiator": "~1.0,>=1.0.1",
+                "doctrine/instantiator": "^1.0.2",
                 "php": ">=5.3.3",
-                "phpunit/php-text-template": "~1.2"
+                "phpunit/php-text-template": "~1.2",
+                "sebastian/exporter": "~1.2"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.3"
+                "phpunit/phpunit": "~4.4"
             },
             "suggest": {
                 "ext-soap": "*"
@@ -467,34 +468,35 @@
                 "mock",
                 "xunit"
             ],
-            "time": "2014-10-03 05:12:11"
+            "abandoned": true,
+            "time": "2015-10-02T06:51:40+00:00"
         },
         {
             "name": "sebastian/comparator",
-            "version": "1.1.0",
+            "version": "1.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/comparator.git",
-                "reference": "c484a80f97573ab934e37826dba0135a3301b26a"
+                "reference": "2b7424b55f5047b47ac6e5ccb20b2aea4011d9be"
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-                "reference": "c484a80f97573ab934e37826dba0135a3301b26a",
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                 "php": ">=5.3.3",
-                "sebastian/diff": "~1.1",
-                "sebastian/exporter": "~1.0"
+                "sebastian/diff": "~1.2",
+                "sebastian/exporter": "~1.2 || ~2.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.1"
+                "phpunit/phpunit": "~4.4"
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-                    "dev-master": "1.1.x-dev"
+                    "dev-master": "1.2.x-dev"
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@@ -531,32 +533,32 @@
                 "compare",
                 "equality"
             ],
-            "time": "2014-11-16 21:32:38"
+            "time": "2017-01-29T09:50:25+00:00"
         },
         {
             "name": "sebastian/diff",
-            "version": "1.2.0",
+            "version": "1.4.3",
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                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "5843509fed39dee4b356a306401e9dd1a931fec7"
+                "reference": "7f066a26a962dbe58ddea9f72a4e82874a3975a4"
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-                "reference": "5843509fed39dee4b356a306401e9dd1a931fec7",
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+                "php": "^5.3.3 || ^7.0"
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+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
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             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.2-dev"
+                    "dev-master": "1.4-dev"
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@@ -579,36 +581,36 @@
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             ],
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-            "homepage": "http://www.github.com/sebastianbergmann/diff",
+            "homepage": "https://github.com/sebastianbergmann/diff",
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-            "time": "2014-08-15 10:29:00"
+            "time": "2017-05-22T07:24:03+00:00"
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-            "version": "1.2.1",
+            "version": "1.3.8",
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+                "php": "^5.3.3 || ^7.0"
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+                "phpunit/phpunit": "^4.8 || ^5.0"
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+                    "dev-master": "1.3.x-dev"
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@@ -633,32 +635,34 @@
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-            "time": "2014-10-25 08:00:45"
+            "time": "2016-08-18T05:49:44+00:00"
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-            "version": "1.0.2",
+            "version": "1.2.2",
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-                "php": ">=5.3.3"
+                "php": ">=5.3.3",
+                "sebastian/recursion-context": "~1.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.0"
+                "ext-mbstring": "*",
+                "phpunit/phpunit": "~4.4"
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             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.0.x-dev"
+                    "dev-master": "1.3.x-dev"
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@@ -698,20 +702,20 @@
                 "export",
                 "exporter"
             ],
-            "time": "2014-09-10 00:51:36"
+            "time": "2016-06-17T09:04:28+00:00"
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         {
             "name": "sebastian/global-state",
-            "version": "1.0.0",
+            "version": "1.1.1",
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                 "url": "https://github.com/sebastianbergmann/global-state.git",
-                "reference": "c7428acdb62ece0a45e6306f1ae85e1c05b09c01"
+                "reference": "bc37d50fea7d017d3d340f230811c9f1d7280af4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/c7428acdb62ece0a45e6306f1ae85e1c05b09c01",
-                "reference": "c7428acdb62ece0a45e6306f1ae85e1c05b09c01",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/bc37d50fea7d017d3d340f230811c9f1d7280af4",
+                "reference": "bc37d50fea7d017d3d340f230811c9f1d7280af4",
                 "shasum": ""
             },
             "require": {
@@ -749,20 +753,73 @@
             "keywords": [
                 "global state"
             ],
-            "time": "2014-10-06 09:23:50"
+            "time": "2015-10-12T03:26:01+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "1.0.5",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "b19cc3298482a335a95f3016d2f8a6950f0fbcd7"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/b19cc3298482a335a95f3016d2f8a6950f0fbcd7",
+                "reference": "b19cc3298482a335a95f3016d2f8a6950f0fbcd7",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.4"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2016-10-03T07:41:43+00:00"
         },
         {
             "name": "sebastian/version",
-            "version": "1.0.4",
+            "version": "1.0.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/version.git",
-                "reference": "a77d9123f8e809db3fbdea15038c27a95da4058b"
+                "reference": "58b3a85e7999757d6ad81c787a1fbf5ff6c628c6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/a77d9123f8e809db3fbdea15038c27a95da4058b",
-                "reference": "a77d9123f8e809db3fbdea15038c27a95da4058b",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/58b3a85e7999757d6ad81c787a1fbf5ff6c628c6",
+                "reference": "58b3a85e7999757d6ad81c787a1fbf5ff6c628c6",
                 "shasum": ""
             },
             "type": "library",
@@ -784,36 +841,41 @@
             ],
             "description": "Library that helps with managing the version number of Git-hosted PHP projects",
             "homepage": "https://github.com/sebastianbergmann/version",
-            "time": "2014-12-15 14:25:24"
+            "time": "2015-06-21T13:59:46+00:00"
         },
         {
-            "name": "symfony/yaml",
-            "version": "v2.6.3",
-            "target-dir": "Symfony/Component/Yaml",
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.10.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/Yaml.git",
-                "reference": "82462a90848a52c2533aa6b598b107d68076b018"
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/Yaml/zipball/82462a90848a52c2533aa6b598b107d68076b018",
-                "reference": "82462a90848a52c2533aa6b598b107d68076b018",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/e3d826245268269cd66f8326bd8bc066687b4a19",
+                "reference": "e3d826245268269cd66f8326bd8bc066687b4a19",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
+            "suggest": {
+                "ext-ctype": "For best performance"
+            },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.6-dev"
+                    "dev-master": "1.9-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Symfony\\Component\\Yaml\\": ""
-                }
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -822,16 +884,72 @@
             "authors": [
                 {
                     "name": "Symfony Community",
-                    "homepage": "http://symfony.com/contributors"
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "backendtea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-08-06T14:22:27+00:00"
+        },
+        {
+            "name": "symfony/yaml",
+            "version": "v2.8.49",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/yaml.git",
+                "reference": "02c1859112aa779d9ab394ae4f3381911d84052b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/02c1859112aa779d9ab394ae4f3381911d84052b",
+                "reference": "02c1859112aa779d9ab394ae4f3381911d84052b",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.3.9",
+                "symfony/polyfill-ctype": "~1.8"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Yaml\\": ""
                 },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
                 {
                     "name": "Fabien Potencier",
                     "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony Yaml Component",
-            "homepage": "http://symfony.com",
-            "time": "2015-01-03 15:33:07"
+            "homepage": "https://symfony.com",
+            "time": "2018-11-11T11:18:13+00:00"
         }
     ],
     "aliases": [],
@@ -840,8 +958,12 @@
         "andy128k/pegp": 20
     },
     "prefer-stable": false,
+    "prefer-lowest": false,
     "platform": {
         "php": ">=5.3"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "5.6.4"
+    }
 }
diff --git a/src/collection.php b/src/collection.php
index 11b31e1..cbf6934 100644
--- a/src/collection.php
+++ b/src/collection.php
@@ -92,6 +92,33 @@ final class Collection
         return $groups;
     }
 
+    /**
+     * indexByProperty($collection, $propertyName) === array_column($collection, null, $propertyName) for PHP >= 7
+     */
+    public static function indexByProperty($collection, $propertyName)
+    {
+        $groups = array();
+        foreach ($collection as $item) {
+            $key = is_object($item) ? $item->$propertyName : $item[$propertyName];
+            $groups[$key] = $item;
+        }
+        return $groups;
+    }
+
+    /**
+     * columnByProperty($collection, $value, $key) === array_column($collection, $value, $key) for PHP >= 7
+     */
+    public static function columnByProperty($collection, $valueProperty, $keyProperty)
+    {
+        $groups = array();
+        foreach ($collection as $item) {
+            $key = is_object($item) ? $item->$keyProperty : $item[$keyProperty];
+            $value = is_object($item) ? $item->$valueProperty : $item[$valueProperty];
+            $groups[$key] = $value;
+        }
+        return $groups;
+    }
+
     public static function inits($collection)
     {
         $result = array();
diff --git a/t/CollectionTest.php b/t/CollectionTest.php
index 24db627..62a0ed8 100644
--- a/t/CollectionTest.php
+++ b/t/CollectionTest.php
@@ -73,5 +73,44 @@ class CollectionTest extends PHPUnit_Framework_TestCase
         $this->assertEquals(array(array(), array(1), array(1, '2'), array(1, '2', 3)),
             \PFF\Collection::inits(array(1, '2', 3)));
     }
-}
 
+    public function testIndexByPropertyWithObjects() {
+        $o1 = (object)array('id' => 1, 'name' => 'first');
+        $o2 = (object)array('id' => 2, 'name' => 'second');
+        $o3 = (object)array('id' => 3, 'name' => 'third');
+        $this->assertEquals(
+            array(1 => $o1, 2 => $o2, 3 => $o3),
+            \PFF\Collection::indexByProperty(array($o1, $o2, $o3), 'id')
+        );
+    }
+
+    public function testIndexByPropertyWithArrays() {
+        $o1 = array('id' => 1, 'name' => 'first');
+        $o2 = array('id' => 2, 'name' => 'second');
+        $o3 = array('id' => 3, 'name' => 'third');
+        $this->assertEquals(
+            array(1 => $o1, 2 => $o2, 3 => $o3),
+            \PFF\Collection::indexByProperty(array($o1, $o2, $o3), 'id')
+        );
+    }
+
+    public function testColumnByPropertyWithObjects() {
+        $o1 = (object)array('id' => 1, 'name' => 'first');
+        $o2 = (object)array('id' => 2, 'name' => 'second');
+        $o3 = (object)array('id' => 3, 'name' => 'third');
+        $this->assertEquals(
+            array('first' => 1, 'second' => 2, 'third' => 3),
+            \PFF\Collection::columnByProperty(array($o1, $o2, $o3), 'id', 'name')
+        );
+    }
+
+    public function testColumnByPropertyWithArrays() {
+        $o1 = array('id' => 1, 'name' => 'first');
+        $o2 = array('id' => 2, 'name' => 'second');
+        $o3 = array('id' => 3, 'name' => 'third');
+        $this->assertEquals(
+            array('first' => 1, 'second' => 2, 'third' => 3),
+            \PFF\Collection::columnByProperty(array($o1, $o2, $o3), 'id', 'name')
+        );
+    }
+}
-- 
2.49.0