array_diff_key() tutorial will explain you how to compare arrays using keys in PHP with an example.
PHP array_diff_key() function compares two or more arrays, and returns an array with the keys and values from the first array, only if they are not available in other arrays.Syntax: array_diff_key(array1,array2,array3...)
Parameters Description:array1 : Required. The first array is compared with the others arrays.
array2 : Required. An array to be compared with the first array.
array3 : Optional. An array to be compared with the first array.
Tip: Compare the first array with one array or more arrays.
Note: Only the key is used in the comparison.
Example:
<?php
$daysarr1 = array(0=>"Sunday",1=>"Monday",2=>"Tuesday");
$daysarr2 = array(2=>"Thursday",3=>"Wednesday",4=>"Friday");
$daysarr3 = array(5=>"Tuesday",6=>"Monday",7=>"Thursday");
print_r( array_diff_key($daysarr1,$daysarr2,$daysarr3) );
?>
O/P:
Array (
[0] => Sunday
[1] => Monday
)
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