The difference between is_file, file_exists and is_dir in php_PHP tutorial

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

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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

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echo file_exists("test.txt");

?> Enter 1 is_dir determines whether the directory exists; Example

The code is as follows

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$file = "images";<🎜> if(is_dir($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

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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 =...