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>';
}
chdir
(PHP 4, PHP 5)
chdir — cambia directory
Descrizione
bool chdir
( string
$directory
)
Cambia la directory in uso da parte del PHP in
directory. Restituisce TRUE in caso di successo, FALSE in caso di fallimento.
Example #1 Esempio di uso di chdir()
<?php
// directory corrente
echo getcwd() . "\n";
chdir('public_html');
// directory corrente
echo getcwd() . "\n";
?>
Il precedente esempio visualizzerà:
/home/vincent /home/vincent/public_html
Nota: Quando safe-mode è abilitato, PHP controlla che la directory nella quale si sta lavorando, abbia lo stesso UID dello script che è in esecuzione.
Vedere anche getcwd().
add a note
User Contributed Notes 3 notes
andy dot clark at dial dot pipex dot com ¶
7 years ago
herwin at snt dot utwente dot nl ¶
7 years ago
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)
php dot duke at qik dot nl ¶
4 years ago
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"