The difference between is_file, file_exists and is_dir in php

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The difference between is_file, file_exists and is_dir in php_PHP tutorial

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Jul 13, 2016 pm 04:56 PM

dir exists file php and the difference and article of

This article introduces the difference between is_file, file_exists and is_dir in php. Friends in need can refer to it.

is_file only determines whether the file exists;

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The code is as follows

代码如下

复制代码

$file = "test.txt"; 　　
if(is_file($file)) { 　　
echo ("$file is a regular file"); 　　
}else { 　　
echo ("$file is not a regular file"); 　　
} 　　
?> 　　

输出：test.txt is a regular file

Copy code

代码如下

复制代码

echo file_exists("test.txt");
?>

输入

$file = "test.txt";

if(is_file($file)) { 　

echo ("$file is a regular file");

代码如下

复制代码

$file = "images";
if(is_dir($file))
{
echo ("$file is a directory");
}
else
{
echo ("$file is not a directory");
}
?>

输出：

images is a directory

}else { 　

echo ("$file is not a regular file");

} 　

Output: test.txt is a regular file

file_exists determines whether the file or directory exists;

代码如下

复制代码

文件存在(当前目录)
is_file:0.4570ms
file_exists:2.0640ms
文件存在(绝对路径3层/www/hx/a/)
is_file:0.4909ms
file_exists:3.3500ms
文件存在(绝对路径5层/www/hx/a/b/c/)
is_file:0.4961ms
file_exists:4.2100ms
文件不存在(当前目录)
is_file:2.0170ms
file_exists:1.9848ms
文件不存在(绝对路径5层/www/hx/a/b/c/)
is_file:4.1909ms
file_exists:4.1502ms
目录存在
file_exists:2.9271ms
is_dir:0.4601ms
目录不存在
file_exists:2.9719ms
is_dir:2.9359ms

The code is as follows

Copy code

echo file_exists("test.txt");