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# escapeshellcmd

(PHP 3, PHP 4, PHP 5)

escapeshellcmd -- Escape shell metacharacters

## Beskrivelse

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.

## Parameterliste

command

  The command that will be escaped.

## Returneringsværdier

The escaped string.

## Eksempler

Eksempel 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\""); ?>`

## Se også

escapeshellarg()
exec()
popen()
system()
backtick operator

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escapeshellarg | op | exec