PHP's very useful advanced functions PATH_SEPARATOR constant and set_include_path

zendframework’s example index.php has this sentence set_include_path('.' . PATH_SEPARATOR . '../library/'. PATH_SEPARATOR . './application/models/'. PATH_SEPARATOR . './application/lib/'. In fact, it is a constantYou can know its value by directly echoing it. On Linux, it is a ":" sign, and on WIN, it is a ";" sign. Set_include_path is to set the include file path of php, which is quite the environment of the operating system. Variables// Works as of PHP 4.3.0

set_include_path('/inc'); // Works in all PHP versionsini_set('include_path', '/inc');?> Regarding the issue of set_include_path, under win, when you want to include multiple paths, you have to separate them with ";", but under Linux, use ";": "Separated. So the zf code above is a perfect match. get_include_path gets the currently existing environment variable Definition and usage pathinfo() function returns the file path information in the form of an array.
Syntax

pathinfo(path,options)

Parameters

DescriptionOptional. Specifies the array elements to be returned. The default is all. Possible values: pathinfo() Returns an associative array containing path Information.

path	Required. Specifies the path to be checked.
process_sections
	PATHINFO_DIRNAME - only returns dirname PATHINFO_BASENAME - only returns basename PATHINFO_EXTENSION - only returns extension Description

Includes the following array elements:

[dirname]

[basename]

[extension]

• Tips and Notes
• Note: If it is not required to obtain all units, the pathinfo() function returns characters string.

Example

Example 1

<?php
print_r(pathinfo("/testweb/test.txt"));
?>

Output:

Array
(
[dirname] => /testweb
[basename] => test.txt
[extension] => txt
)

Example 2

<?php
print_r(pathinfo("/testweb/test.txt",PATHINFO_BASENAME));
?>

Output:

test.txt

DIRECTORY_SEPARATOR window below

Instructions Path separator

windows

or /

linux

/

function __autoload($classname){　if(preg_match('/\\/',$classname)){　　$path = str_repace('\',DIRECTORY_SEPARATOR,$classname);       }else{ 　 $path = str_replace('_',DIRECTORY_SEPARATOR,$classname); }　require_once("$path.php");} Reprinted from: http:// www.cnblogs.com/jackluo/archive/2013/04/09/3010257.html

The above has introduced PHP's very useful advanced functions PATH_SEPARATOR constant and set_include_path, including relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.