PHP Filesystem is_dir() Function

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The PHP Filesystem is_dir() function is used to check if a path is a directory. It requires a path that you want to check to be given and passed. The method returns true if the path is a directory and returns false otherwise.

Syntax

Below is the syntax of the PHP Filesystem is_dir() function −

bool is_dir(string $path)

Parameters

Below are the required parameters of the is_dir() function −

Return Value

The function is_dir() returns true if the path is a directory, FALSE otherwise.

PHP Version

The is_dir() function was first introduced as part of core PHP 4 and work well with the PHP 5, PHP 7 and PHP 8.

Example

We have used the PHP Filesystem is_dir() function to check that the given path is a directory or not.

<?php
   // Mention the directory path here
   $path = '/Desktop/PhpProjects';

   if (is_dir($path)) {
      echo "The path is a directory.";
   } else {
      echo "The path is not a directory.";
   }
?>

Output

Here is the outcome of the following code −

The path is a directory.

Example

This PHP example will perform the operation to check if a path is a directory or a file with the help of is_dir() function.

<?php
   //mention your path here
   $path = '/var/www/html/index.php';

   // Check if the given path is directory or file
   if (is_dir($path)) {
      echo "The path is a directory.";
   } else {
      echo "The path is not a directory.";
   }
?> 

Output

This will produce the following result −

The path is not a directory.

Example

In this PHP code, we will use is_dir() function with a relative path. So if the mentioned path is a relative path so it will return true otherwise false.

<?php
   // Mention the relative path here
   $relativePath = './uploads';

   if (is_dir($relativePath)) {
       echo "The relative path is a directory.";
   } else {
       echo "The relative path is not a directory.";
   }
?> 

Output

This will generate the below result −

The relative path is a directory.

Example

In this PHP code, we will use is_dir() function to check multiple paths given in the array $paths. So it will check if the given paths are directory or not.

<?php
   // Mention multiple paths here
   $paths = ['/var/www/html', '/var/www/html/uploads', '/var/www/html/file.txt'];

   foreach ($paths as $path) {
      if (is_dir($path)) {
         echo "The path '$path' is a directory.\n";
      } else {
         echo "The path '$path' is not a directory.\n";
      }
   }

?> 

Output

This will produce the following output −

The path '/var/www/html' is a directory.
The path '/var/www/html/uploads' is a directory.
The path '/var/www/html/file.txt' is not a directory.

Note

• Verify to make sure the path is correct and easy to find.
• This function is useful when you need to make that a directory exists before performing specific file actions, such reading or writing files.

Summary

The is_dir() function is a powerful function for checking the given path is a directory in PHP. This method is useful to verify that directories exist before doing file operations.