What does opendir in php mean?

opendir is a built-in function in php, used to open a directory handle. The syntax is opendir(path,context), the parameter path is required and refers to the directory path to be opened.

php opendir() function

opendir() function is used to open a directory handle for subsequent Used with other directory functions such as closedir(), readdir(), and rewinddir().

Syntax

opendir(path,context);

Parameters

● Path: required. Specifies the directory path to be opened.

●Context: Optional. Specifies the environment for directory handles. context is a set of options that modify the behavior of the directory stream.

Return value: If successful, the directory handle resource is returned. Returns FALSE on failure.

Errors and exceptions:

● If the path is not a legal directory, or the directory cannot be opened due to licensing restrictions or file system errors, an E_WARNING level error is thrown .

●You can hide the error output of opendir() by adding '@' before the function name.

PHP Version: 4.0

Example

<?php
$dir = "/images/";
// Open a directory, and read its contents
if (is_dir($dir)){
if ($dh = opendir($dir)){
while (($file = readdir($dh)) !== false){
echo "filename:" . $file . "<br>";
}
closedir($dh);
}
}
?>

Result:

filename: cat.gif
filename: dog.gif
filename: horse.gif

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