Is_dir () function user guide in PHP _ PHP Tutorial-php Tutorial

PHP is_dir () function User Guide. In PHP, the is_dir () function usage guide php provides the built-in function is_dir to check whether the input path parameter is a directory. if it is a directory, true is returned. That is to say, the input parameters are files or is_dir () function usage instructions in PHP.

Php provides the built-in function is_dir to check whether the input path parameter is a directory. if it is a directory, true is returned. That is to say, if the input parameter is a file or does not exist, it is false. Therefore, the current parameter cannot be used as a folder or a file. In addition, you must note that parameters support relative paths and absolute paths.

Function: is_dir ()

Function: determines whether the specified file name is a directory.

Note:

Bool is_dir (string $ filename)

Returns TRUE if the file name exists and is a directory.

If filename is a relative path, check its relative path according to the current working directory.

Note: the result of this function is cached. For more information, see clearstatcache ().

Example 1

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Var_dump(is_dir('a_file.txt '). "\ n "; Var_dump (is_dir ('bogus _ dir/ABC'). "\ n "; Var_dump (is_dir ('..'); // one dir up ?>

The above example will output:

Bool (false)

Bool (false)

Bool (true)

Example 2

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$ File = "images "; If (is_dir ($ file )) { Echo ("$ file is a directory "); } Else { Echo ("$ file is not a directory "); } ?>

Output:

If the images directory exists, the output is:

Images is a directory

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Usage () function guide php provides the built-in function is_dir to check whether the input path parameter is a directory. if it is a directory, true is returned. That is to say, the input parameter is a file or not...