Folder Structure Updated

.gitignore

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+.idea
+vendor

Arrays/.gitignore

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+.idea

Arrays/array_change_key_case.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array change key case() function returns an array
+ * with all array KEYS in lower case or upper case.
+ *
+ *
+ * Syntax:
+ *    array_change_key_case(array, case)
+ *
+ *    array   -   Required. Specifies the array to use
+ *    case    -   Optional. Possible values
+ *                   1. CASE_LOWER - Default value. Changes the keys to lowercase
+ *                   2. CASE_UPPER - Changes the keys to uppercase
+ *
+ */
+
+// Example 1:
+$userAges = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
+
+echo '<pre>';
+print_r(array_change_key_case($userAges, CASE_UPPER));
+print_r(array_change_key_case($userAges, CASE_LOWER));
+print_r(array_change_key_case($userAges));
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array
+ * (
+ *    [PETER] => 35
+ *    [BEN] => 37
+ *    [JOE] => 43
+ * )
+ *
+ * Array
+ * (
+ *    [peter] => 35
+ *    [ben] => 37
+ *    [joe] => 43
+ * )
+ *
+ * Array
+ * (
+ *    [peter] => 35
+ *    [ben] => 37
+ *    [joe] => 43
+ * )
+ */

Arrays/array_chunk.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_chunk() function splits an array
+ * into chunks of new arrays.
+ *
+ *
+ * Syntax:
+ *    array_chunk(array, size, preserve_key)
+ *
+ *    array          -  Required. Specifies the array to use
+ *    size           -  Required. An integer that specifies the size of each chunk
+ *    preserve_key   -  Optional. Possible values:
+ *                         1. true - Preserves the keys
+ *                         2. false - Default. Reindexes the chunk numerically
+ *
+ */
+
+// Example 1:
+$users = array("Peter" => "35", "Ben" => "37", "Joe" => "43", "Harry" => "50");
+
+echo '<pre>';
+print_r(array_chunk($users, 3, true));
+print_r(array_chunk($users, 2, false));
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [0] => Array 
+ *       (
+ *          [Peter] => 35 
+ *          [Ben] => 37
+ *       ) 
+ *    [1] => Array 
+ *       (
+ *          [Joe] => 43 
+ *          [Harry] => 50
+ *       )
+ * )
+ * 
+ * Array 
+ * (
+ *    [0] => Array 
+ *       (
+ *          [0] => 35 
+ *          [1] => 37
+ *       ) 
+ *    [1] => Array 
+ *       (
+ *          [0] => 43 
+ *          [1] => 50
+ *       )
+ * )
+ */

Arrays/array_column.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_column() function returns the values from
+ * a single column in the input array.
+ *
+ *
+ * Syntax:
+ *    array_column(array, column_key, index_key)
+ *
+ *    array       -  Required. Specifies the multi-dimensional array (record-set)
+ *                   to use. As of PHP 7.0, this can also be an array of objects.
+ *    column_key  -  Required. An integer key or a string key name of the column
+ *                   of values to return. This parameter can also be NULL to return
+ *                   complete arrays (useful together with index_key to re-index the array).
+ *    index_key   -  Optional. The column to use as the index/keys for the returned array.
+ *
+ */
+
+// Example 1:
+$users = array(
+   array(
+      'id'         => 5698,
+      'first_name' => 'Peter',
+      'last_name'  => 'Burgman',
+   ),
+   array(
+      'id'         => 4767,
+      'first_name' => 'Ben',
+      'last_name'  => 'Smith',
+   ),
+   array(
+      'id'         => 3809,
+      'first_name' => 'John',
+      'last_name'  => 'Doe',
+   )
+);
+
+$lastNames = array_column($users, 'last_name');
+
+echo '<pre>';
+print_r($lastNames);
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [0] => Burgman 
+ *    [1] => Smith 
+ *    [2] => Doe
+ * )
+ */

Arrays/array_combine.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_combine() function creates an array by using
+ * the elements from one "keys" array and one "values" array.
+ *
+ *
+ * Syntax:
+ *    array_combine(keys, values)
+ *
+ *    keys   - Required. Array of keys
+ *    values - Required. Array of values
+ *
+ */
+
+// Example 1:
+$users = ['Peter', 'Smith', 'John'];
+$ages  = [35, 42, 29];
+
+$combine = array_combine($ages, $users);
+
+echo '<pre>';
+print_r($combine);
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [Peter] => 35 
+ *    [Smith] => 42 
+ *    [John] => 29
+ * )
+ */

Arrays/array_count_values.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_count_values() function counts all the values of an array.
+ *
+ *
+ * Syntax:
+ *    array_count_values(array)
+ *
+ */
+
+// Example 1:
+$fruits = ['Apple', 'Mango', 'Banana', 'Lemon', 'Apple', 'Orange', 'Strawberry', 'Mango', 'Apple'];
+
+echo '<pre>';
+print_r(array_count_values($fruits));
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [Apple] => 2 
+ *    [Mango] => 2 
+ *    [Banana] => 1 
+ *    [Lemon] => 1 
+ *    [Orange] => 1 
+ *    [Strawberry] => 1
+ * )
+ */

Arrays/array_diff.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_diff() function compares the values of
+ * two (or more) arrays, and returns the differences.
+ *
+ *
+ * Syntax:
+ *    array_diff(array1, array2, array3, ...)
+ *
+ */
+
+// Example 1:
+$arr1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
+$arr2 = array("e" => "red", "f" => "green", "g" => "blue");
+
+$result = array_diff($arr1, $arr2);
+
+echo '<pre>';
+print_r($result);
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [d] => yellow
+ * )
+ */

Arrays/array_fill.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_fill() function fills an array with values.
+ *
+ *
+ * Syntax:
+ *    array_fill(index, number, value)
+ * 
+ *    index  - Required. The first index of the returned array
+ *    number - Required. Specifies the number of elements to insert
+ *    value  - Required. Specifies the value to use for filling the array
+ *
+ */
+
+// Example 1:
+$result = array_fill(1, 3, "blue");
+
+echo '<pre>';
+print_r($result);
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array 
+ * (
+ *    [2] => blue 
+ *    [3] => blue 
+ *    [4] => blue 
+ *    [5] => blue
+ * )
+ */

Arrays/array_filter.php

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+<?php
+
+/**
+ * Definition and Usage:
+ *    The array_filter() function filters the values
+ * of an array using a callback function.
+ *
+ *
+ * Syntax:
+ *    array_filter(array, callbackfunction, flag)
+ *
+ *    array             - Required. Specifies the array to filter
+ *    callbackfunction  - Optional. Specifies the callback function to use
+ *    flag              - Optional. Specifies what arguments are sent to callback:
+ *
+ *                         ARRAY_FILTER_USE_KEY - pass key as the only argument to callback (instead of the value)
+ *                         ARRAY_FILTER_USE_BOTH - pass both value and key as arguments to callback (instead of the value)
+ *
+ */
+
+// Example 1:
+$number = [1, 2, 3, 4, 5, 6, 7, 8, 9];
+
+$oddNum = array_filter($number,
+   function ($num) {
+      if ($num % 2 == 1) {
+         return $num;
+      }
+   }
+);
+
+$evenNum = array_filter($number,
+   function ($num) {
+      if ($num % 2 === 0) {
+         return $num;
+      }
+   }
+);
+
+
+echo '<pre>';
+print_r($oddNum);
+print_r($evenNum);
+echo '</pre>';
+
+/**
+ * The output of the code above will be:
+ * Array
+ * (
+ *    [1] => 2
+ *    [3] => 4
+ *    [5] => 6
+ *    [7] => 8
+ * )
+ *
+ * Array
+ * (
+ *    [0] => 1
+ *    [2] => 3
+ *    [4] => 5
+ *    [6] => 7
+ *    [8] => 9
+ * )
+ */