php中file_exists函数使用详解_php实例
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。
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。
实例一
<?php $filename = '/php.net/aa/to/foo.txt'; if (file_exists($filename)) { echo "文件$filename exists"; } else { echo "文件$filename 不存在"; } ?>
输出结果为:
文件/php.net/aa/to/foo.txt己存在
实例二
<?php echo file_exists("php.net.txt"); ?>
直接用file_exists来返回ture or false。
以上所述就是本文的全部内容了,希望大家能够喜欢。

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