tryphp_func_array_walk3.php:
<!DOCTYPE html> <html> <body> <?php function myfunction(&$value,$key) { $value="yellow"; } $a=array("a"=>"red","b"=>"green","c"=>"blue"); array_walk($a,"myfunction"); print_r($a); ?> </body> </html>
Array ( [a] => yellow [b] => yellow [c] => yellow )