is_file() 函數檢查指定的檔案名稱是否是正常的檔案。
is_file — Tells whether the filename is a regular file
用法:
bool is_file ( string $filename ) $file 為必選參數
如果檔案存在且為正常的檔案則返回 TRUE。
先來看一個執行個體一:
<?phpvar_dump(is_file('a_file.txt')) . "\n";var_dump(is_file('/usr/bin/')) . "\n";?>
上例將輸出:
bool(true)
bool(false)
執行個體二:
<?phpfunction isfile($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 herereturn '(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');?>
執行個體三:
<?phpfunction 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);}}}}}?>
此函數將刪除所有檔案與檔案夾。
以上所述就是本文的全部內容了,希望大家能夠喜歡。