tryphp_func_array_diff_key3.php:
<!DOCTYPE html> <html> <body> <?php $a1=array("a"=>"red","b"=>"green","c"=>"blue"); $a2=array("c"=>"yellow","d"=>"black","e"=>"brown"); $a3=array("f"=>"green","c"=>"purple","g"=>"red"); $result=array_diff_key($a1,$a2,$a3); print_r($result); ?> </body> </html>
Array ( [a] => red [b] => green )