How to get all the contents of a directory in PHP

This article will introduce to you how to obtain all the contents in the directory in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

This time we will introduce a directory iterator in the SPL library. Its function is actually very simple. As you can see from the name, it is to get all the items in the specified directory. content. Previously, we had to traverse the directory to obtain the directory and all the files in the directory, which usually required recursive traversal. To be honest, it is quite troublesome to write this code by ourselves, so PHP has prepared this set of built-in APIs for us. When entering the specified directory Then, directly return the contents of all subdirectories and files in the directory. Of course, it is not a tree shape, and the order is not certain. If we want to organize it into a tree shape, we need to process it ourselves.

Without further ado, let’s look at the code directly:

$path = $argv[1];

// 获取目录下所有内容
$dirs = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path), RecursiveIteratorIterator::SELF_FIRST);

foreach($dirs as $k=>$d){
    echo 'key:'. $k, PHP_EOL;
    if($d->isDir()){
        echo $d->getPathname(), PHP_EOL;
    }else{
        echo $d->getFilename(), PHP_EOL;
    }
}

//执行 php PHP获取目录中的全部内容RecursiveDirectoryIterator.php ../

// key:../.
// ../.
// key:../..
// ../..
// key:../source
// ../source
// key:../source/.
// ../source/.
// key:../source/..
// ../source/..
// key:../source/PHP获取目录中的全部内容RecursiveDirectoryIterator.php
// PHP获取目录中的全部内容RecursiveDirectoryIterator.php
// key:../source/PHP大文件读取操作.php
// PHP大文件读取操作.php
// key:../PHP大文件读取操作.md
// PHP大文件读取操作.md
// key:../PHP获取目录中的全部内容RecursiveDirectoryIterator.md
// PHP获取目录中的全部内容RecursiveDirectoryIterator.md

It’s actually just one line of code, and then directly loops to output the iterator. From the results, we can see that first enter the source directory and then traverse the external file contents, and obtain all the contents in the directory in the order of directory and file name. Isn’t it much more convenient than writing the recursive function ourselves?

What if we want to get all the PHP files in the directory and calculate their total file size? Using this set of iterator operations can also be completed very simply. We only need to add a regular iterator to filter the previous iterator content:

// 获取所有php文件
$regIts = new RegexIterator($dirs, '/^.+\.php$/i');
$fileSize = 0;
foreach($regIts as $k=>$p){
    echo $p->getSize() . ' ' .  $k, PHP_EOL;
    $fileSize += $p->getSize();
}
echo 'Total ', $fileSize, PHP_EOL;

// 622 ../source/PHP获取目录中的全部内容RecursiveDirectoryIterator.php
// 869 ../source/PHP大文件读取操作.php
// Total 1491

It feels the same as ls -l, It can conveniently allow us to perform related operations under the directory. The use of this class is briefly introduced here. There are many capabilities in the SPL library that are worthy of our exploration. Learn slowly and practice slowly to continuously improve our ability for elegant programming.

Test code:

https://github.com/zhangyue0503/dev-blog/blob/master/php/202003/source/PHP%E8%8E%B7%E5%8F%96%E7%9B%AE%E5%BD%95%E4%B8%AD%E7%9A%84%E5%85%A8%E9%83%A8%E5%86%85%E5%AE%B9RecursiveDirectoryIterator.php

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