escapeshellcmd
(PHP 3, PHP 4, PHP 5)
escapeshellcmd -- Escape shell metacharacters
说明
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.
参数
- command
The command that will be escaped.
例
例子 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\"");
?>
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