Guide to using is_dir() function in PHP_PHP Tutorial

Guide to the use of is_dir() function in PHP

PHP provides the built-in function is_dir to check whether the incoming path parameter is a directory and returns true if it is a directory. That is to say, if the parameter passed in is a file or does not exist, it will be false, so the current parameter cannot be said to be either a folder or a file. Another thing to note is that parameters support relative paths and absolute paths.

Function: is_dir()

Function: Determine whether the given file name is a directory

Description:

bool is_dir ( string $filename )

Returns TRUE if the filename exists and is a directory.

If filename is a relative path, its relative path is checked against the current working directory.

Note: The result of this function will be cached. See clearstatcache() for more information.

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 ?>

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$file = "images"; if(is_dir($file)) { echo ("$file is a directory"); } else { echo ("$file is not a directory"); } ?>

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, output: 　images is a directory The above is the entire content of this article, I hope you all like it. http://www.bkjia.com/PHPjc/996756.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/996756.htmlTechArticleGuide to the use of is_dir() function in PHP. PHP provides the built-in function is_dir to check whether the incoming path parameter is a directory. Returns true if it is a directory. That is to say, the parameter passed in is a file or not...

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