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What does opendir in php mean?

青灯夜游
青灯夜游Original
2019-10-10 17:45:052962browse

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.

What does opendir in php mean?

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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