Replace space and all Illegal character on string - PHP

Hi, ,
Do you search for how to replace/remove illegal character (@#$%^&* etc) in your text string?
On this post I will share you simple code to make it.
This code will only allowed numbers (0-9) and characters (a-z).

my code :

<?php
    $string = 'by^#^we%%&bs.b_((logs+)&#@pot.()*)(~co!~@#_+m';
    $string = preg_replace('/[^0-9 a-z]+/i', '', $string);
    
    echo $string;
?>

And below is code for replace multiple space on your text string

<?php
    $string = 'by   webs.   blog  spot.  com';
    $string = str_replace(array(' '),array(''),$string);
    
    echo $string;
?>

Hope it will useful for all,
If you have questions or suggestions, please write your comment below.

Good Luck :)