php之readdir函数用法实例,readdir函数实例
php之readdir函数用法实例,readdir函数实例
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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