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() (manual/en/function.escapeshellarg.php) or escapeshellcmd() (manual/en/function.escapeshellcmd.php)
quotemetaОписаниеstring quotemeta ( string str )Возвращает строку str, в которой вставлен обратный слэш (\) перед каждым символом из следующего списка:
См. также описания функций addslashes(), htmlentities(), htmlspecialchars(), nl2br() и stripslashes().
quotemeta
George Adams
16-Feb-2006 08:57
15-May-2001 03:41
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).
03-Apr-2001 12:04
qutemeta() is note for quoting meta tags, but is for quoting characters which can be misunderstanded by php or a database.
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quoted_printable_decode