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(PHP 4 >= 4.3.0, PHP 5)
set_include_path — Sets the include_path configuration option
Sets the include_path configuration option for the duration of the script.
Returns the old include_path on successIm Fehlerfall wird FALSE zurückgegeben..
Beispiel #1 set_include_path() example
<?php
// Works as of PHP 4.3.0
set_include_path('/inc');
// Works in all PHP versions
ini_set('include_path', '/inc');
?>
Beispiel #2 Adding to the include path
Making use of the PATH_SEPARATOR constant, it is possible to extend the include path regardless of the operating system.
In this example we add /usr/lib/pear to the end of the existing include_path.
<?php
$path = '/usr/lib/pear';
set_include_path(get_include_path() . PATH_SEPARATOR . $path);
?>
Seems set_include_path wasn't working for me.
The problem was i didn't have .: in my include_path
Which seemed to stop the set_include_path().
It seems you can't really set empty inlude_path. First, set_include_path('') does exactly nothing (successfully), and second, '.' is always implicitly appended to the include path by PHP itself, as noted in comments below.
However, you can:
set_include_path(PATH_SEPARATOR); // note no quotes around the PATH_SEPARATOR; it's a string on its own
or, more explicit:
set_include_path('.');
Both seems to have the same result.
If you find that this function is failing for you, and you're not sure why, you may have set your php include path in your sites's conf file in Apache (this may be true of .htaccess as well)
So to get it to work, comment out any "php_value include_path" type lines in your Apache conf file, and you should be able to set it now in your php code.
The files are included in order of the inclusion path, in this example, the directory structure is as follows:
.
|-- index.php
|-- t1
| |-- a
| `-- b
`-- t2
|-- b
`-- c
<?php
set_include_path('t1'.PATH_SEPARATOR.'t2');
include 'a'; // includes from T1
include 'b'; // includes from T1
include 'c'; // includes from T2
?>
Note that the include path affects only include/require functions.
<?php
var_dump(file_exists('a')); // false
var_dump(fopen('b', 'r')); // file not found
?>
Two functions to help:
<?php
function add_include_path ($path)
{
foreach (func_get_args() AS $path)
{
if (!file_exists($path) OR (file_exists($path) && filetype($path) !== 'dir'))
{
trigger_error("Include path '{$path}' not exists", E_USER_WARNING);
continue;
}
$paths = explode(PATH_SEPARATOR, get_include_path());
if (array_search($path, $paths) === false)
array_push($paths, $path);
set_include_path(implode(PATH_SEPARATOR, $paths));
}
}
function remove_include_path ($path)
{
foreach (func_get_args() AS $path)
{
$paths = explode(PATH_SEPARATOR, get_include_path());
if (($k = array_search($path, $paths)) !== false)
unset($paths[$k]);
else
continue;
if (!count($paths))
{
trigger_error("Include path '{$path}' can not be removed because it is the only", E_USER_NOTICE);
continue;
}
set_include_path(implode(PATH_SEPARATOR, $paths));
}
}
?>
Can be useful to check the value of the constant PATH_SEPARATOR.
<?php
if ( ! defined( "PATH_SEPARATOR" ) ) {
if ( strpos( $_ENV[ "OS" ], "Win" ) !== false )
define( "PATH_SEPARATOR", ";" );
else define( "PATH_SEPARATOR", ":" );
}
?>
For older versions of php, PATH_SEPARATOR is not defined.
If it is so, we must check what kind of OS is on the web-server and define PATH_SEPARATOR properly
You can also add several paths in one set_include_path separating them by ':'.
ex : set_include_path('/home/mysite/includes1:/home/mysite/includes2')
When you use .htaccess to set the include path, don't forget Apache directive 'AllowOverride Options' or 'AllowOverride All' is also needed.
In order to use .htaccess files to set the include path, PHP must be installed as an Apache module. If PHP is compiled as a CGI binary, you can set the include path in a custom php.ini file (if, for example, you're being hosted somewhere and don't have access to the main php.ini file. Note that custom php.ini files don't affect subdirectories in the way that .htaccess files do, so you'll need to put your custom php.ini file in any subdirectories as well.
If you want to set the paths php uses to find included files on a directory by directory level, you can do so in Apache's .htaccess file. Add the line:
php_value include_path "<first path to look>:<second path>:<etc>:."
to the .htaccess file. This will replace any paths set in your environment or the php.ini file so remember to include the path to php's own libraries as, usually, the first option!
V.useful tip given to me by the 'php guy' at Edinburgh Uni's Computing Support.
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