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PHP中is_file()函数使用指南_php实例

Jun 07, 2016 pm 05:13 PM
is_file() php

is_file() 函数检查指定的文件名是否是正常的文件。

is_file — Tells whether the filename is a regular file

用法:
bool is_file ( string $filename ) $file 为必选参数
如果文件存在且为正常的文件则返回 TRUE。

先来看一个实例一:

<&#63;php
var_dump(is_file('a_file.txt')) . "\n";
var_dump(is_file('/usr/bin/')) . "\n";
&#63;>
Copy after login

上例将输出:
bool(true)
bool(false)

实例二:

<&#63;php
function isfile($file){
return preg_match('/^[^.^:^&#63;^-][^:^&#63;]*.(&#63;i)' . getexts() . '$/',$file);
//first character cannot be . : &#63; - subsequent characters can't be a : &#63;
//then a . character and must end with one of your extentions
//getexts() can be replaced with your extentions pattern
}
function getexts(){
//list acceptable file extensions here
return '(app|avi|doc|docx|exe|ico|mid|midi|mov|mp3|
mpg|mpeg|pdf|psd|qt|ra|ram|rm|rtf|txt|wav|word|xls)';
}
echo isfile('/Users/YourUserName/Sites/index.html');
&#63;>
Copy after login

实例三:

<&#63;php
function deletefolder($path)
{
if ($handle=opendir($path))
{
while (false!==($file=readdir($handle)))
{
if ($file<>"." AND $file<>"..")
{
if (is_file($path.'/'.$file))
{
@unlink($path.'/'.$file);
}
if (is_dir($path.'/'.$file))
{
deletefolder($path.'/'.$file);
@rmdir($path.'/'.$file);
}
}
}
}
}
&#63;>
Copy after login

此函数将删除所有文件与文件夹。

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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