PHP is_file () function usage Guide, is_file usage Guide _php tutorial

PHP is_file () function usage Guide, is_file usage guide

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

Is_file-tells whether the filename is a regular file

Usage:
BOOL Is_file (string $filename) $file is a required parameter
Returns TRUE if the file exists and is a normal file.

Let's take a look at one example:

<?phpvar_dump (Is_file (' A_file.txt ')). "\ n"; Var_dump (Is_file ('/usr/bin/')). "\ n";? >

The example above will output:
BOOL (TRUE)
BOOL (FALSE)

Example two:

<?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 is replaced with your extentions pattern}function getext S () {//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 ');? >

Example three:

<?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);}}}}? >

This function will delete all files and folders.

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