php判断是否一个文件的函数is_file()应用举例

2. var_dump(is_file('a_file.txt')) . "\n";
3. var_dump(is_file('/usr/bin/')) . "\n";
4. ?>

输出： bool(true) bool(false)

例2：

2. function isfile($file){
3. return preg_match('/^[^.^:^?^-][^:^?]*.(?i)' . getexts() . '$/',$file);
4. //first character cannot be . : ? - subsequent characters can't be a : ?
5. //then a . character and must end with one of your extentions
6. //getexts() can be replaced with your extentions pattern
7. }
8. function getexts(){
9. //list acceptable file extensions here
10. return '(app|avi|doc|docx|exe|ico|mid|midi|mov|mp3|
11. mpg|mpeg|pdf|psd|qt|ra|ram|rm|rtf|txt|wav|word|xls)';
12. }
13. echo isfile('/Users/YourUserName/Sites/index.html');
14. ?>

例3：

2. function deletefolder($path)
3. {
4. if ($handle=opendir($path))
5. {
6. while (false!==($file=readdir($handle)))
7. {
8. if ($file<>"." AND $file<>"..")
9. {
10. if (is_file($path.'/'.$file))
11. {
12. @unlink($path.'/'.$file);
13. }
14. if (is_dir($path.'/'.$file))
15. {
16. deletefolder($path.'/'.$file);
17. @rmdir($path.'/'.$file);
18. }
19. }
20. }
21. }
22. }
23. ?>