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php之readdir函数用法实例

Jun 06, 2016 pm 08:17 PM
php usage

这篇文章主要介绍了php中readdir函数用法,以实例讲述了readdir函数操作目录的具体用法与相关的注意事项,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了php中readdir函数用法。分享给大家供大家参考。具体用法分析如下:

定义和用法:readdir() 函数返回由 opendir() 打开的目录句柄中的条目,若成功,则该函数返回一个文件名,否则返回 false.

实例一,代码如下:

复制代码 代码如下:

$dir = "readdir/";
 
// 判断是否为目录
if (is_dir($dir)) {
    if ($dh = opendir($dir)) {
        while (($file = readdir($dh)) !== false) {
            echo "filename: $file : filetype: " . filetype($dir . $file) . " ";
        }
        closedir($dh);
    }
}


实例二,注意在 4.0.0-RC2 之前不存在 !== 运算符,代码如下:

复制代码 代码如下:

if ($handle = opendir('/path/to/files')) {
    echo "Directory handle: $handle ";
    echo "Files: ";
 
    /* 这是正确地遍历目录方法 */
    while (false !== ($file = readdir($handle))) {
        echo "$file ";
    }
 
    /* 这是错误地遍历目录的方法 */
    while ($file = readdir($handle)) {
        echo "$file ";
    }
    closedir($handle);
}


实例三,readdir() 将会返回 . 和 .. 条目,如果不想要它们,只要过滤掉即可,例子 2. 列出当前目录的所有文件并去掉 . 和 ..,代码如下:

复制代码 代码如下:

if ($handle = opendir('.')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != "." && $file != "..") {
            echo "$file ";
        }
    }
    closedir($handle);
}


注:readdir必须与opendir配合使用才行.

希望本文所述对大家的php程序设计有所帮助。

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