Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > The difference between is_file, file_exists and is_dir in php_PHP tutorial

The difference between is_file, file_exists and is_dir in php_PHP tutorial

WBOY
Release： 2016-07-13 16:56:36
Original
1069 people have browsed it

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;

Related labels：
dir exists file php and the difference and article of
source：php.cn
Previous article：Sharing of pdf word excel operation classes in php_PHP tutorial Next article：PHP long article paging principle and implementation procedure_PHP tutorial
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
PHP arrays obtained from URL parameters do not behave as expected I have a URL parameter that contains the category ID and I want to treat it as an array li...
From 2024-04-06 22:09:02
0
1
1428
Where should I place CustomLog directive in apache I'm using php:7.2-apachedocker. I need to disable health check url login access log. Based...
From 2024-04-06 22:03:59
0
1
990
What is the format of the variables in the return value? I am a new learner of php. I found a piece of code: if($x<time()){return[false,'error']...
From 2024-04-06 21:55:20
0
1
778
Problems encountered when using opentbs to generate odt files: values ​​of the same key are displayed in the same row instead of separate columns. I'm using a library called OpenTbs to create odt using PHP, I'm using it because columns a...
From 2024-04-06 20:18:18
0
1
483
Group MySQL results by ID for looping over I have a table with flight data in mysql. I'm writing a php code that will group and displ...
From 2024-04-06 17:27:56
0
1
406
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template

Public welfare online PHP training，Help PHP learners grow quickly！

About us Disclaimer Sitemap

© php.cn All rights reserved

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

1

$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");
?>Enter 1 is_dir determines whether the directory exists; Example
The code is as follows Copy code
$file = "images";<🎜> if(is_dir($file))<🎜> {<🎜> echo ("$file is a directory");<🎜> }<🎜> else<🎜> {<🎜> echo ("$file is not a directory");<🎜> }<🎜> ?> Output: images is a directory Looking at the manual, although the results of these two functions will be cached, is_file is N times faster. One more thing worth noting: When the file exists, is_file is N times faster than file_exists; When the file does not exist, is_file is slower than file_exists; The conclusion is that the file_exits function does not affect the speed depending on whether the file actually exists, but the impact of is_file is greater Test
The code is as follows Copy code
File exists (current directory) is_file:0.4570ms file_exists:2.0640ms File exists (absolute path level 3/www/hx/a/) is_file:0.4909ms file_exists:3.3500ms The file exists (absolute path level 5/www/hx/a/b/c/) is_file:0.4961ms file_exists:4.2100ms File does not exist (current directory) is_file:2.0170ms file_exists:1.9848ms The file does not exist (absolute path level 5/www/hx/a/b/c/) is_file:4.1909ms file_exists:4.1502ms Directory exists file_exists:2.9271ms is_dir:0.4601ms Directory does not exist file_exists:2.9719ms is_dir:2.9359ms http://www.bkjia.com/PHPjc/631588.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631588.htmlTechArticleThis 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; the code is as follows Copy the code ?php $file =...