<?php
$str = "Hello world. (can you hear me?)";
echo quotemeta($str);
?>
The output of the code above will be:
Hello world\. \(can you hear me\?\)(PHP 4, PHP 5, PHP 7, PHP 8)
quotemeta — Protège les métacaractères
   Retourne la chaîne str
   après avoir introduit un antislash (\)
   devant tous les caractères suivants :
   
stringLa chaîne d'entrée.
   Retourne la chaîne dont les métacaractères ont été protégés ou
   false si une chaîne vide est fournie dans le paramètre
   string.
  
Exemple #1 Exemple avec quotemeta()
<?php
 
var_dump(quotemeta('PHP is a popular scripting language. Fast, flexible, and pragmatic.'));
?>L'exemple ci-dessus va afficher :
string(69) "PHP is a popular scripting language\. Fast, flexible, and pragmatic\."
Note: Cette fonction gère les chaînes binaires.
<?php
$str = "Hello world. (can you hear me?)";
echo quotemeta($str);
?>
The output of the code above will be:
Hello world\. \(can you hear me\?\)Took me a while to realize this was NOT the command I wanted for escaping potentially harmful characters in a string that would be used as part of a system command.  Instead, I needed either escapeshellarg() (http://www.php.net/manual/en/function.escapeshellarg.php) or escapeshellcmd() (http://www.php.net/manual/en/function.escapeshellcmd.php)This function escapes characters that have special meaning in regular expressions.  preg_quote() <http://php.net/manual/en/function.preg-quote.php> has similar functionality, but is more powerful since it escapes more characters (including one user-specified character).