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+[![Build Status](https://travis-ci.org/grasmash/expander.svg?branch=master)](https://travis-ci.org/grasmash/expander) [![Packagist](https://img.shields.io/packagist/v/grasmash/expander.svg)](https://packagist.org/packages/grasmash/expander)
+[![Total Downloads](https://poser.pugx.org/grasmash/expander/downloads)](https://packagist.org/packages/grasmash/expander) [![Coverage Status](https://coveralls.io/repos/github/grasmash/expander/badge.svg?branch=master)](https://coveralls.io/github/grasmash/expander?branch=master)
+
+This tool expands property references in PHP arrays. For example implementation, see Yaml Expander.
+
+### Installation
+
+    composer require grasmash/expander
+
+### Example usage:
+
+Property references use dot notation to indicate array keys, and must be wrapped in `${}`.
+
+Expansion logic:
+
+```php
+<?php
+
+$array = [
+    'type' => 'book',
+    'book' => [
+        'title' => 'Dune',
+        'author' => 'Frank Herbert',
+        'copyright' => '${book.author} 1965',
+        'protaganist' => '${characters.0.name}',
+        'media' => [
+            0 => 'hardcover',
+            1 => 'paperback',
+        ],
+        'nested-reference' => '${book.sequel}',
+    ],
+    'characters' => [
+        0 => [
+            'name' => 'Paul Atreides',
+            'occupation' => 'Kwisatz Haderach',
+            'aliases' => [
+                0 => 'Usul',
+                1 => 'Muad\'Dib',
+                2 => 'The Preacher',
+            ],
+        ],
+        1 => [
+            'name' => 'Duncan Idaho',
+            'occupation' => 'Swordmaster',
+        ],
+    ],
+    'summary' => '${book.title} by ${book.author}',
+    'publisher' => '${not.real.property}',
+    'sequels' => '${book.sequel}, and others.',
+    'available-products' => '${book.media.1}, ${book.media.0}',
+    'product-name' => '${${type}.title}',
+    'boolean-value' => true,
+    'null-value' => NULL,
+    'inline-array' => [
+        0 => 'one',
+        1 => 'two',
+        2 => 'three',
+    ],
+    'expand-array' => '${inline-array}',
+    'env-test' => '${env.test}',
+];
+
+$expander = new Expander();
+// Optionally set a logger.
+$expander->setLogger(new Psr\Log\NullLogger());
+// Optionally set a Stringfier, used to convert array placeholders into strings. Defaults to using implode() with `,` delimeter.
+// @see StringifierInterface.
+$expander->setStringifier(new Grasmash\Expander\Stringifier());
+
+// Parse an array, expanding internal property references.
+$expanded = $expander->expandArrayProperties($array);
+
+// Parse an array, expanding references using both internal and supplementary values.
+$reference_properties =  'book' => ['sequel' => 'Dune Messiah'];
+// Set an environmental variable.
+putenv("test=gomjabbar");
+$expanded = $expander->expandArrayProperties($array, $reference_properties);
+
+print_r($expanded);
+````
+
+Resultant array:
+
+```php
+Array
+(
+    [type] => book
+    [book] => Array
+        (
+            [title] => Dune
+            [author] => Frank Herbert
+            [copyright] => Frank Herbert 1965
+            [protaganist] => Paul Atreides
+            [media] => Array
+                (
+                    [0] => hardcover
+                    [1] => paperback
+                )
+
+            [nested-reference] => Dune Messiah
+        )
+
+    [characters] => Array
+        (
+            [0] => Array
+                (
+                    [name] => Paul Atreides
+                    [occupation] => Kwisatz Haderach
+                    [aliases] => Array
+                        (
+                            [0] => Usul
+                            [1] => Muad'Dib
+                            [2] => The Preacher
+                        )
+
+                )
+
+            [1] => Array
+                (
+                    [name] => Duncan Idaho
+                    [occupation] => Swordmaster
+                )
+
+        )
+
+    [summary] => Dune by Frank Herbert
+    [publisher] => ${not.real.property}
+    [sequels] => Dune Messiah, and others.
+    [available-products] => paperback, hardcover
+    [product-name] => Dune
+    [boolean-value] => 1
+    [null-value] =>
+    [inline-array] => Array
+        (
+            [0] => one
+            [1] => two
+            [2] => three
+        )
+
+    [expand-array] => one,two,three
+    [env-test] => gomjabbar
+    [env] => Array
+        (
+            [test] => gomjabbar
+        )
+
+)
+
+```