Question

I have this expression,

$thing = "linkin park @#%^&* 999"; 
$thing = preg_replace('#\W#', '', $thing); 
echo $thing;

and it results to linkinpark999. I just need an expression which will result to linkin_park_999. It will be great if you explain me the code too.

Answer 1

You can try:

$thing = preg_replace('#\W+#', '_', $thing);