[Resolved] How can I limit the data accepted into my php script

[phpsharma]

hi all,
How can I limit the data accepted into my php script

$username = 'ABC123^#!'

Would End Up Being

ABC123

I dont want it to give any errors I just want it to be automatic.

by
sharma

[lilleman]

Try using regular expressions:

<?php

$username = 'ABC123^#!';
$new_name = preg_replace('#[^a-z0-9]#i', '', $username);

echo $new_name;

?>

[phpsharma]

Hi its working fine but, why # and #i used. please could you explain that.

<?php

$username = 'ABC123^#!';
$new_name = preg_replace('#[^a-z0-9]#i', '', $username);

echo $new_name;

?>
bye
sharma

[lilleman]

The # is used to decide where the pattern for the expression start and end. The i is a pattern modifier that tells the function to do a case-insensitive search.