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PHP array_diff_key() Function

 <?php

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","c"=>"blue","d"=>"pink");

$result=array_diff_key($a1,$a2);
print_r($result);

?>


Output:

Array ( [b] => green )



Syntex:
array_diff_key(array1, array2, array3, ...)
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