Easy way to find a file in subdirectory with php

原文地址：http://blog.makemepulse.com/2008/02/18/tips-easy-way-to-find-a-file-in-subdirectory-with-php/

<?php
class DirectorySearch {

private
$iterator,
$directoryname;
public function __construct($directoryname){
$this->iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directoryname,RecursiveDirectoryIterator::KEY_AS_FILENAME));
}

public function find($filename){
foreach($this->iterator as $entry){
if($filename == $this->iterator->current()){
return $this->iterator->getPathName();
}
}
return false;
}
}

实际应用：

<?php
$directory = dirname(__FILE__)."/directory";

$search_directory = new DirectorySearch($directory);
$path_file = $search_directory->find("file_to_find.php");

if($path_file !== false){
//include_once($path_file);
echo $path_file;
}

If we don’t use the KEY_AS_FILENAME with the recursiveDirectoryIterator we will have the whole path of the file in $this->iterator->current();

如果我们不使用recursiveDirectoryIterator类的KEY_AS_FILENAME，我们也可以使用文件的全路径$this->iterator->current();

All of this is a basic example of the RecursiveIteratorIterator with the RecursiveDirectoryIterator. SPL is a very powerfull toolkit !

这只是RecursiveDirectoryIterator的一个基本的功能，不得不说，SPL是一个非常好的工具。

自己的话：

以前遍历目录找文件一般是两种方法：1、opendir，2、glob，然后来遍历整个目录。如今SPL里有现成的，那肯定是这样的速度更快，效率更高喽？只是。。。不知道对中文文件名的支持会怎么[已测试，让我失望]

<?php
function read_dir( $dir) {
$array = array();
$d = dir($dir);
while (false !== ($entry = $d->read())) {
if($entry!='.' && $entry!='..') {
$entry = $dir.'/'.$entry;
if(is_dir($entry)) {
$array[] = $entry;
$array = array_merge($array, read_dir($entry));
} else {
$array[] = $entry;
}
}
}
$d->close();
return $array;
}
function get_file ($file, $file_path ){
foreach ( $file_path as $_k => $_v ){
if ( basename($_v) == $file ){
return $_v ;
}
}

}
?>

测试下来。。。让我失望。

<?php
$directory = dirname(__FILE__)."/Discuz!_6.0.0_SC_UTF8";
$sTime = microtime(true);

$search_directory = new DirectorySearch($directory);
$path_file = $search_directory->find("buy中文.htm");

if($path_file !== false){
//include_once($path_file);
echo( $path_file );
}
echo '<pre>';
print_r( microtime(true) - $sTime );
echo '</pre>';

$sTime = microtime(true);
$f = 'buy中文.htm';
echo( get_file($f,read_dir($directory)) );
echo '<pre>';
print_r( microtime(true) - $sTime );
echo '</pre>';

使用CLass的时间是0.86550688743591

使用function的时间是：0.54081797599792

鉴定完毕：支持中文文件名

Easy way to find a file in subdirectory with php

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