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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>PHP Intersect Two Arrays Using a Key Comparison Function</title> </head> <body> <pre> <?php // Define key comparison function function compare($a, $b){ // Converting key to lowercase $a = strtolower($a); $b = strtolower($b); if($a == $b){ return 0; } return ($a < $b) ? -1 : 1; } // Sample arrays $array1 = array("a"=>"apple", "b"=>"ball", "c"=>"cat"); $array2 = array("A"=>"airplane", "x"=>"xylophone", "y"=>"yacht"); // Computing the intersection $result = array_intersect_ukey($array1, $array2, "compare"); print_r($result); ?> </pre> </body> </html>
