PHP5中文手册·Escape shell metacharacters -- 追寻梦想＞编程乐园＞PHP 编程

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.

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.

参数

command: The command that will be escaped.

返回值

The escaped string.

范例

Example#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\"");
?>


	PHP5中文手册 escapeshellarg exec Program Execution PHP Manual escapeshellcmd (PHP 4, PHP 5) escapeshellcmd — Escape shell metacharacters 说明 string escapeshellcmd ( string `$command` ) escapeshellcmd() escapes any characters in a string that might be used to trick a shell command into executing arbitrary commands. This function should be used to make sure that any data coming from user input is escaped before this data is passed to the exec() or system() functions, or to the backtick operator. Following characters are preceded by a backslash: #&;`\|?~<>^()[]{}$\, \x0A* and \xFF. ' and " are escaped only if they are not paired. In Windows, all these characters plus % are replaced by a space instead. 参数 `command` The command that will be escaped. 返回值 The escaped string. 范例 Example#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\""); ?>` 参见 escapeshellarg() exec() popen() system() backtick operator escapeshellarg exec Program Execution PHP Manual

escapeshellcmd

说明

参数

返回值

范例

参见