PHP array_diff () and array_diff_key () Functions

Let's take a look at the PHP array_diff () syntax.

Definition and usage
The array_diff () function compares two or more arrays and returns the entry and value of an array from the first array, only when the value is not in any other array.

Syntax

Array_diff (array1, array2, array3 ...)
Parameter description: required by array1. The first array, the other will be required with array2. An array is optional relative to the first array array3. An array is relative to the first array. Tip and note: You can compare the first array with an array, or you like it. Note: Only value is used for comparison. Let's take a look at the instance. <? Php
$ A1 = array (0 => "Cat", 1 => "Dog", 2 => "Horse ");
$ A2 = array (3 => "Horse", 4 => "Dog", 5 => "Fish ");
Print_r (array_diff ($ a1, $ a2 ));
?> Output result. Array ([0] => Cat)