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(PHP 4, PHP 5)
chdir — Wechseln des Verzeichnisses
Wechselt das aktuelle Verzeichnis von PHP zu directory.
Das neue aktuelle Verzeichnis
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiel #1 chdir() Beispiel
<?php
// aktuelles Verzeichnis
echo getcwd() . "\n";
chdir('public_html');
// aktuelles Verzeichnis
echo getcwd() . "\n";
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
/home/vincent /home/vincent/public_html
Hinweis: Wenn Safe Mode aktiviert ist überprüft PHP, ob das Arbeitsverzeichnis, die gleiche UID (Eigentümer) hat wie das Skript selbst.
When changing dir's under windows environments:
<?php
$path="c:\temp"';
chdir($path);
/* getcwd() gives you back "c:\temp" */
$path="c:\temp\"';
chdir($path);
/* getcwd() gives you back "c:\temp\" */
?>
to work around this inconsistency
doing a chdir('.') after the chdir always gives back "c:\temp"
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>';
}
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)
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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