arg
- Versions
- 5
arg($index)- 6 – 7
arg($index = NULL, $path = NULL)
Return a component of the current Drupal path.
When viewing a page at the path "admin/structure/types", for example, arg(0) returns "admin", arg(1) returns "content", and arg(2) returns "types".
Avoid use of this function where possible, as resulting code is hard to read. In menu callback functions, attempt to use named arguments. See the explanation in menu.inc for how to construct callbacks that take arguments. When attempting to use this function to load an element from the current path, e.g. loading the node on a node page, please use menu_get_object() instead.
Parameters
$index The index of the component, where each component is separated by a '/' (forward-slash), and where the first component has an index of 0 (zero).
$path A path to break into components. Defaults to the path of the current page.
Return value
The component specified by $index, or NULL if the specified component was not found.
Code
core/includes/path.inc, line 258
<?php
function arg($index = NULL, $path = NULL) {
// Even though $arguments doesn't need to be resettable for any functional
// reasons (the result of explode() does not depend on any run-time
// information), it should be resettable anyway in case a module needs to
// free up the memory used by it.
// Use the advanced drupal_static() pattern, since this is called very often.
static $drupal_static_fast;
if (!isset($drupal_static_fast)) {
$drupal_static_fast['arguments'] = &drupal_static(__FUNCTION__);
}
$arguments = &$drupal_static_fast['arguments'];
if (!isset($path)) {
$path = $_GET['q'];
}
if (!isset($arguments[$path])) {
$arguments[$path] = explode('/', $path);
}
if (!isset($index)) {
return $arguments[$path];
}
if (isset($arguments[$path][$index])) {
return $arguments[$path][$index];
}
}
?>