escapeshellcmd

(PHP 4, PHP 5)

escapeshellcmd — Escape shell metacharacters

Описание

string escapeshellcmd ( string $command )

escapeshellcmd() escapes any characters in a string that might be used to trick a shell command into executing arbitrary commands. This function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator.

Following characters are preceded by a backslash: #&;`|*?~<>^()[]{}$\, \x0A and \xFF. ' and " are escaped only if they are not paired. In Windows, all these characters plus % are replaced by a space instead.

Список параметров

command: The command that will be escaped.

Возвращаемые значения

The escaped string.

Примеры

Пример #1 escapeshellcmd() example


<?php
$e = escapeshellcmd($userinput);
 
// here we don't care if $e has spaces
system("echo $e");
$f = escapeshellcmd($filename);
 
// and here we do, so we use quotes
system("touch \"/tmp/$f\"; ls -l \"/tmp/$f\"");
?>

Смотрите также

escapeshellarg() - Escape a string to be used as a shell argument
exec() - Execute an external program
popen() - Открывает файловый указатель процесса
system() - Execute an external program and display the output
backtick operator