[SOLVED] how to change @ to _AT_ and # to _SHARP_ etc

[amb99]

Hi,

 

I am using this method to clean illegal chars from strings.

 

$pattern = '/[^\w\.]/i';
$replacement = '_ILLEGAL_';
$clean = preg_replace($pattern, $replacement, $string);
// note: $string would be the GET or POST of something

 

Is there a way I can display the illegal chars that were removed? If I were to be able to do that, I could display precisely why the string was invalid, and would also be able to change $replacement to be _AT_ if illegal char was '@', or _SHARP_ if '#' and so on. Or is there already a snippet out there that can do this?

 

Thank you for any help.

[alpine]

Here is one, note that its php5 dependant due to str_split()

<?php

$string = "kfgak*suh@hd#t";

$invalid = array();
$filtered = array_values(str_replace(array_merge(range(a,z),range(A,Z),range(0,9),array('.')),'',str_split($string)));
foreach(str_split($string) as $char){
  if(in_array($char,$filtered,true)){
    $invalid[] = $char;
  }
}

if(!empty($invalid)){
  $string = str_replace(array("@","#"), array("_AT_","_SHARP_"), $string);
  $string = str_replace(array_values(str_replace(array_merge(range(a,z),range(A,Z),range(0,9),array('-','.','_')),'',str_split($string))),'_ILLEGAL_',$string);
  echo "<p>Following chars was not accepted:</p><ul><li>";
  echo implode($invalid,'</li><li>');
  echo "</li></ul>";
  echo "String was translated to: $string";
}
else{
  echo "No illegal chars found";
}

?>

 

This example prints out:

Following chars was not accepted:

    * *
    * @
    * #

String was translated to: kfgak_ILLEGAL_suh_AT_hd_SHARP_t

 

No regex though...

[alpine]

I notice from a prev post that you are on php4, here is a str_split function to get my above example running under php4

<?php

function str_split($string)
{
$piece = array();
$length = strlen($string);
for($i=0;$i<$length;$i++) $piece[] = $string{$i};
return $piece;
}

?>

[amb99]

Absolutely amazing. Thank you very much that worked. 

 

Tiny change:

_- were illegal, I updated array('.') to array('-','.','_') for $filtered, it seems to be working

[alpine]

Sorry - a glitch with the array, but you seem to grasp it and that's the point!