Detailed explanation of the use of php dir() function

The dir() function in PHP is a built-in function that returns an instance of the directory class. The function of the dir() function is to read a directory, which includes the following content:

● Open the given directory.

● You can use the two attributes handle and path of dir().

● Both handle and path attributes have three methods: read(), rewind() and close().

The path to the directory is sent to the opendir() function as a parameter. If successful, it will return an instance of the directory class; if it fails, it will return FALSE.

Syntax:

dir($directory, $context)

Parameters:

The dir() function in PHP accepts two parameters, as described below .

$directory: It is a mandatory parameter that specifies the directory path.

$context: It is an optional parameter that specifies the behavior of the stream.

Return value:

Returns an instance of the directory class on success, and returns FALSE on failure.

Errors and exceptions:

If the passed dir() parameter is wrong, a NULL value is returned.

The order in which the read method returns directory entries depends on the system.

dir() function code example:

dir() function code example 1:

<?php 
  
$dir_handle = dir("user/gfg"); 
  
while(($file_name = $dirhandle->read()) !== false)  
{  
    echo("文件名称 : " . $file_name); 
    echo "<br>" ;  
} 
  
?>

Output:

文件名称: gfg.jpg
文件名称: ..
文件名称: gfg.pdf
文件名称: .
文件名称: gfg.txt

dir() function code example 2:

<?php 
  
$dir_handle = dir("user/gfg"); 
  
echo("目录路径: " . $dir_handle->path . "<br>"); 
  
echo("目录处理程序ID: " . $dir_handle->handle . "<br>"); 
  
while(($file_name = $dir_handle->read()) !== false)  
{  
   echo("File Name: " . $file_name); 
   echo "<br>" ;  
}  
  
$dir_handle->close(); 
  
?>

Output:

目录路径: user/gfg
目录处理程序ID: Resource id #2

文件名称: gfg.jpg
文件名称: ..
文件名称: gfg.pdf
文件名称: .
文件名称: gfg.txt

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