Guide to using the is_file() function in PHP_PHP Tutorial-PHP Tutorial-php.cn

Guide to use of is_file() function in PHP

The is_file() function in PHP is used to determine whether a file exists. The usage method is also very simple. Friends who need it can For reference.

　The is_file() function checks whether the specified file name is a normal file.

is_file — Tells whether the filename is a regular file

Usage:

bool is_file ( string $filename ) $file is a required parameter

Return TRUE if the file exists and is a normal file.

Let’s look at an example first:

var_dump(is_file('a_file.txt')) . "n";

var_dump(is_file('/usr/bin/')) . "n";

function isfile($file){

return preg_match('/^[^.^:^?^-][^:^?]*.(?i)' . getexts() . '$/',$file);

//first character cannot be . : ? - subsequent characters can't be a : ?

//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');

var_dump(is_file('a_file.txt')) . "n";

var_dump(is_file('/usr/bin/')) . "n";

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);

}

The above example will output:

bool(true) bool(false)

Example 2: 　?

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8 9 10 11 12 13 14

<🎜>function isfile($file){<🎜> <🎜>return preg_match('/^[^.^:^?^-][^:^?]*.(?i)' . getexts() . '$/',$file);<🎜> <🎜>//first character cannot be . : ? - subsequent characters can't be a : ?<🎜> <🎜>//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');<🎜> <🎜>?>

Example 3: 　?

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"." AND $file<>"..") { if (is_file($path.'/'.$file)) { @unlink($path.'/'.$file); } if (is_dir($path.'/'.$file)) { deletefolder($path.'/'.$file); @rmdir($path.'/'.$file); } } } } } ?>

　This function will delete all files and folders. The above is the entire content of this article, I hope you all like it. http://www.bkjia.com/PHPjc/996758.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/996758.htmlTechArticleGuide to the use of is_file() function in PHP The is_file() function in php is used to determine whether a file exists. How to use it It is also very simple, friends in need can refer to it. is_file() function check...

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source：php.cn

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