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# set_include_path

(PHP 4 >= 4.3.0, PHP 5)

set_include_path -- Sets the include_path configuration option

## 说明

string set_include_path ( string new_include_path )

Sets the include_path configuration option for the duration of the script.

## 参数

`new_include_path`

  The new value for the include_path

## 返回值

Returns the old include_path on success or `FALSE` on failure.

## 范例

例 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'); ?>`

例 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); ?>`

## 参见

ini_set()
get_include_path()
restore_include_path()
include()

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