Used to set the PHP loader or bootstrap stub of a Phar archive

# Phar::setStub

(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL phar >= 1.0.0)

Phar::setStub — Used to set the PHP loader or bootstrap stub of a Phar archive

### Description

public Phar::setStub(resource|string `$stub`, int `$length` = -1): bool

> Note:

> This method requires the php.ini setting `phar.readonly` to be set to `0` in order to work for Phar objects. Otherwise, a PharException will be thrown.

This method is used to add a PHP bootstrap loader stub to a new Phar archive, or to replace the loader stub in an existing Phar archive.

The loader stub for a Phar archive is used whenever an archive is included directly as in this example:

`<?php
include 'myphar.phar';
?>`

The loader is not accessed when including a file through the `phar` stream wrapper like so:

`<?php
include 'phar://myphar.phar/somefile.php';
?>`

### Parameters

`stub`

  A string or an open stream handle to use as the executable stub for this phar archive.

`length`

### Return Values

Returns `true` on success or `false` on failure.

### Errors/Exceptions

UnexpectedValueException is thrown if phar.readonly is enabled in php.ini. PharException is thrown if any problems are encountered flushing changes to disk.

### Changelog

Version | Description
--- | ---
8.3.0 | Calling Phar::setStub() with a resource and a `length` is now deprecated. Such calls should be replaced by: `$phar->setStub(stream_get_contents($resource));`

### Examples

Example #1 A Phar::setStub() example

`<?php
try {
$p = new Phar(dirname(__FILE__) . '/brandnewphar.phar', 0, 'brandnewphar.phar');
$p['a.php'] = '<?php var_dump("Hello");';
$p->setStub('<?php var_dump("First"); Phar::mapPhar("brandnewphar.phar"); __HALT_COMPILER(); ?>');
include 'phar://brandnewphar.phar/a.php';
var_dump($p->getStub());
$p['b.php'] = '<?php var_dump("World");';
$p->setStub('<?php var_dump("Second"); Phar::mapPhar("brandnewphar.phar"); __HALT_COMPILER(); ?>');
include 'phar://brandnewphar.phar/b.php';
var_dump($p->getStub());
} catch (Exception $e) {
echo 'Write operations failed on brandnewphar.phar: ', $e;
}
?>`

The above example will output:

    string(5) "Hello"
    string(82) "<?php var_dump("First"); Phar::mapPhar("brandnewphar.phar"); __HALT_COMPILER(); ?>"
    string(5) "World"
    string(83) "<?php var_dump("Second"); Phar::mapPhar("brandnewphar.phar"); __HALT_COMPILER(); ?>"

### See Also

- Phar::getStub() - Return the PHP loader or bootstrap stub of a Phar archive
- Phar::createDefaultStub() - Create a phar-file format specific stub

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