[SOLVED] preg_replace prob when replace $pattern with $replace['${1}']

[mzhou88]

$variable["new"]="hi";
$variable["cow"]="wow";
$string="nice to meet you [phpfile=new]";
$pattern='/\[phpfile=(\w+)\]/i';
$replace=$variable["$1"];
preg_replace($pattern,$replace,$string);

 

When I tried this, it gave me an error about $1 not existing. Does anyone know how to solve this? Thanks..

 

- Mike