php pathinfo()函数

一.pathinfo()函数 

pathinfo()函数返回一个包含了文件信息的数组，数组中有四个元素，分别是dirname、basename、extension、filename。

举例：

<?php

//pathinfo函数用法

$path = "/www/jbxue/images/logo.jpg";

$fileArr = pathinfo($path);

print_r($fileArr);

//输出结果：Array ( [dirname] => /www/jbxue/images [basename] => logo.jpg [extension] => jpg [filename] => logo )

//根据数组的键名就能够得到对应的键值

echo $fileArr['filename'];

//输出结果：logo

echo $fileArr['extension'];

//输出结果：jpg

?>

二.另外一种实现方法

function path_info($filepath)  

{  

    $path_parts = array();  

    $path_parts ['dirname'] = rtrim(substr($filepath, 0, strrpos($filepath, '/')),"/")."/";  

    $path_parts ['basename'] = ltrim(substr($filepath, strrpos($filepath, '/')),"/");  

    $path_parts ['extension'] = substr(strrchr($filepath, '.'), 1);  

    $path_parts ['filename'] = ltrim(substr($path_parts ['basename'], 0, strrpos($path_parts ['basename'], '.')),"/");  

    return $path_parts;

} 

$path=path_info("/www/jbxue/images/logo.jpg");

var_dump($path);