php file path function

We often encounter the situation of processing file paths.

For example:

1.The file suffix needs to be taken out

2.The path needs to be taken out by name but not the directory

3.Only taken out The directory path in the path name

4. Or parse each part of the URL to obtain an independent value

5. Or even form a url yourself
... .. ..

You need to use path processing class functions in many places.

We have marked the commonly used path processing functions for everyone. You can just process this path processing function:

Function name	Function
pathinfo	Return the various components of the file
basename	Return file name
dirname	File directory part
parse_url	Unpack the URL into its parts
http_build_query	Generate the query string in the url
http_build_url	Generate a url

##pathinfo

array pathinfo ( string $路径)
功能：传入文件路径返回文件的各个组成部份

Let’s use a specific example:

<?php
$path_parts = pathinfo('d:/www/index.inc.php');

echo '文件目录名：'.$path_parts['dirname']."<br />";
echo '文件全名：'.$path_parts['basename']."<br />";
echo '文件扩展名：'.$path_parts['extension']."<br />";
echo '不包含扩展的文件名：'.$path_parts['filename']."<br />"; 
?>

The results are as follows:

文件目录名：d:/www
文件全名：lib.inc.php
文件扩展名：php
不包含扩展的文件名：lib.inc

basename

string basename ( string $路径[, string $suffix ])
功能：传入路径返回文件名
第一个参数传入路径。
第二个参数，指定我文件名到了指定字符停止。

<?php 

echo "1: ".basename("d:/www/index.d", ".d").PHP_EOL;
echo "2: ".basename("d:/www/index.php").PHP_EOL;
echo "3: ".basename("d:/www/passwd").PHP_EOL;

?>

The execution results are as follows

1: index
2: index.php
3: passwd

dirname

dirname(string $路径) 
功能：返回文件路径的文件目录部份

<?php 
dirname(__FILE__); 
?>

Conclusion : You can execute it to see if the directory part of the file is returned.

parse_url

mixed parse_url ( string $路径 )
功能：将网址拆解成各个部份

<?php
$url = 'http://username:password@hostname:9090/path?arg=value#anchor';

var_dump(parse_url($url));

?>

The results are as follows:

array(8) {
["scheme"]=> string(4) "http"
["host"]=> string(8) "hostname"
["port"]=> int(9090)
["user"]=> string(8) "username"
["pass"]=> string(8) "password"
["path"]=> string(5) "/path"
["query"]=> string(9) "arg=value"
["fragment"]=> string(6) "anchor"
}

http_build_query

string http_build_query ( mixed $需要处理的数据)
功能：生成url 中的query字符串

<?php
//定义一个关联数组
$data = [
       'username'=>'php',
       'area'=>'hubei'
        ];

//生成query内容
echo http_build_query($data);
?>

The results are as follows:

username=php&area=hubei

http_build_url() Function: Generate a url

Note:

PHP_EOL constant
Equivalent to echo "\r\n" on the windows platform;
Equivalent to echo "\n" on the unix\linux platform;
Equivalent to echo "\r" on the mac platform;
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