How to learn PHParray_diff_key_PHP tutorial-php Tutorial

How to learn PHParray_diff_key. How to learn PHParray_diff_key definition and usage the array_diff_key () function returns an array, which includes all the elements in the compared array but not in any other parameter array. how to learn PHP array_diff_key

Definition and usage

The array_diff_key () function returns an array containing all the keys in the compared array but not in any other parameter array.

Syntax

Array_diff_key (array1, array2, array3 ...)

Parameters

Description

Array1 is required. The first array to be compared with other arrays.

Array2 is required. The array to be compared with the first array.

Array3 is optional. The array to be compared with the first array. There can be multiple.

Tips and comments

Tip: one or more arrays can be compared with the first array.

Note: only the key name is used for comparison.

Example

"Cat", 1 => "Dog", 2 => "Horse"); $ a2 = array (2 => "Bird", 3 => "Rat ", 4 => "Fish"); $ a3 = array (5 => "Horse", 6 => "Dog", 7 => "Bird "); print_r (array_diff_key ($ a1, $ a2, $ a3);?>

Output:

Array ([0] => Cat [1] => Dog)

Array_diff_key definition and usage the array_diff_key () function returns an array that includes all the elements in the compared array but not in any other parameter array...