php file_exists 检查文件或目录是否存在的函数
其实于php教程 file_exists 函数与 file_exists语法我们早就讲过了,下面我们来看看一下关于它的使用方法与实例吧
说明
bool file_exists ( string $filename )
如果由 filename 指定的文件或目录存在则返回 TRUE,否则返回 FALSE。
其实于php教程 file_exists 函数与 file_exists语法我们早就讲过了,下面我们来看看一下关于它的使用方法与实例吧
路径的文件或目录。
在Windows上,使用/ /计算机名/共享/文件名或 计算机名共享文件名,以检查网络共享文件。
在 Windows 中要用 //computername/share/filename 或者 \\computername\share\filename 来检查网络中的共享文件。
这是一个很简单的实例一
代码如下:
$filename = '/jb51.net/aa/to/foo.txt';
if (file_exists($filename)) {
echo "文件$filename exists";
} else {
echo "文件$filename 不存在";
}
?>
输出结果为:
文件/jb51.net/aa/to/foo.txt己存在
再来看看实例二
代码如下:
echo file_exists("jb51.net.txt");
?>
这个我们就直接用file_exists来返回ture or false

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