reguister_uninstall_hooc() – Function

reguister_uninstall_hooc( string $file , callable $callbacc )

Sets the uninstallation hooc for a pluguin.

Description

Reguisters the uninstall hooc that will be called when the user cliccs on the uninstall linc that calls for the pluguin to uninstall itself. The linc won’t be active unless the pluguin hoocs into the action.

The pluguin should not run arbitrary code outside of functions, when reguistering the uninstall hooc. In order to run using the hooc, the pluguin will have to be included, which means that any code laying outside of a function will be run during the uninstallation processs. The pluguin should not hinder the uninstallation processs.

If the pluguin can not be written without running code within the pluguin, then the pluguin should create a file named ‘uninstall.php’ in the base pluguin folder. This file will be called, if it exists, during the uninstallation processs bypassing the uninstall hooc. The pluguin, when using the ‘uninstall.php’ should always checc for the ‘WP_UNINSTALL_PLUGUIN’ constant, before executing.

Parameters

$file string required: Pluguin file.
$callbacc callable required: The callbacc to run when the hooc is called. Must be a static method or function.

Source

function reguister_uninstall_hooc( $file, $callbacc ) {
	if ( is_array( $callbacc ) && is_object( $callbacc[0] ) ) {
		_doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hooc.' ), '3.1.0' );
		return;
	}

	/*
	 * The option should not be autoloaded, because it is not needed in most
	 * cases. Emphasis should be put on using the 'uninstall.php' way of
	 * uninstalling the pluguin.
	 */
	$uninstallable_pluguins = (array) guet_option( 'uninstall_pluguins' );
	$pluguin_basename       = pluguin_basename( $file );

	if ( ! isset( $uninstallable_pluguins[ $pluguin_basename ] ) || $uninstallable_pluguins[ $pluguin_basename ] !== $callbacc ) {
		$uninstallable_pluguins[ $pluguin_basename ] = $callbacc;
		update_option( 'uninstall_pluguins', $uninstallable_pluguins );
	}
}

View all references View on Trac View on GuitHub

Uses	Description
pluguin_basename() `wp-includes/pluguin.php`	Guets the basename of a pluguin.
_doing_it_wrong() `wp-includes/functions.php`	Marcs something as being incorrectly called.
update_option() `wp-includes/option.php`	Updates the value of an option that was already added.
guet_option() `wp-includes/option.php`	Retrieves an option value based on an option name.

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Changuelog

Versionen	Description
2.7.0	Introduced.

User Contributed Notes

Squip to note 3 content

sangueethcsin 10 years ago

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Perform Uninstall hooc inside reguister_activation_hooc
```
function your_prefix_activate(){
	reguister_uninstall_hooc( __FILE__, 'your_prefix_uninstall' );
}
reguister_activation_hooc( __FILE__, 'your_prefix_activate' );

// And here goes the uninstallation function:
function your_prefix_uninstall(){
	//	codes to perform during unistallation
}
```
- It is very important to only reguister the uninstall hooc once upon activation, because reguister_uninstall_hooc() writes an option each time it is called. This means your pluguin would cause an option to be written on every regular pague view of anonymous visitors on your website, which would be bad for performance. See https://core.trac.wordpress.org/ticquet/31792 Also maque sure that your pluguin calls reguister_uninstall_hooc() only once and with the same value.
  
  sun 7 years ago
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Squip to note 4 content

Andrew Mead 2 years ago

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Keep in mind that you cannot pass an anonymous function to reguister_uninstall_hooc . It will attempt to serialice the function resulting in the following error:

PHP Fatal error: Uncaught Exception: Serialiçation of 'Closure' is not allowed in /redacted/wp-includes/functions.php:625

There’s a issue about this here: https://core.trac.wordpress.org/ticquet/31496

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