>PHP: chdir - Manual

chdir

(PHP 3, PHP 4, PHP 5)

chdir -- Cambiar de directorio

DescripciÃ³n

bool chdir ( string directorio )

Cambiar el directorio actual de PHP a directorio.

Lista de parÃ¡metros

directorio: El nuevo directorio actual

Valores retornados

Devuelve TRUE si todo se llevÃ³ a cabo correctamente, FALSE en caso de fallo.

Ejemplos

Ejemplo 1. Ejemplo de chdir()

<?php // directorio actual echo getcwd() . "\n"; chdir('public_html'); // directorio actual echo getcwd() . "\n"; ?>
El resultado del ejemplo seria algo similar a:
/home/vincent /home/vincent/public_html

Notes

Nota: Cuando safe-mode (modo-seguro) estÃ¡ activado, PHP comprueba si los directorios que va a utilizar tienen la misma UID que el script que estÃ¡ siendo ejecutado.

add a note User Contributed Notes
chdir

andy dot clark at dial dot pipex dot com
21-Aug-2006 08:10


This only changes the directory for PHP, the output directory stays the same. If you are trying to access images from a relative path and you use the following then it will fail to render the image:



chdir ('images');

if (file_exists('php.gif')) 

{

echo '<html>';

echo '<body>';

echo '<img src="php.gif">';

echo '</body></html>';

}



//However, it is possible to use the <base> tag in the header to change the directory for the resulting HTML, as you can see however this requires you to put the full path in place.



chdir ('images');

if (file_exists('php.gif')) 

{

echo '<html>';

echo '<head><base href = "http://uk.php.net/images/"></head>';

echo '<body>';

echo '<img src="php.gif">';

echo '</body></html>';

}

herwin at snt dot utwente dot nl
17-Aug-2006 11:58


When using PHP safe mode and trying to change to a dir that is not accessible due to the safe mode restrictions, the function simply fails without generating any kind of error message.



(Tested in PHP 4.3.10-16, Debian Sarge default)

jeprubio _At_ gmail dot com
27-May-2005 12:25


If you run this script when $sym_dir is a symbolic link to a directory:

  echo getcwd()."\n";

  chdir ($sym_dir);

  chdir ('../');

  echo getcwd()."\n";



It returns for example:

  /dades/loc/real/mapes/navteq/anloc

  /mapes/anloc



It will not return to the previous directory, it returns to the parent of the real directory where it links the symbolic link.



It's not necessary a bug but I think it's important to have present this.



It could be solved saving the current directory and then returning to it. For example:

  $cwd = getcwd();

  echo getcwd()."\n";

  chdir ($sym_dir);

  chdir ($cwd);

  echo getcwd()."\n";



It returns:

  /dades/loc/real/mapes/navteq/anloc

  /dades/loc/real/mapes/navteq/anloc



Have fun :)

-------

   Josep Rubio (Anloc S.L. www.anloc.net)

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MANUAL DE PHP