PropGuard.php
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PropGuard.php
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	<?php

	namespace Wikimedia\RemexHtml;

	use InvalidArgumentException;

	/**
	* This is a statically configurable mechanism for preventing the setting of
	* undeclared properties on objects. The point of it is to detect programmer
	* errors.
	*/
	trait PropGuard {
	public static $armed = true;

	public function __set( $name, $value ) {
	if ( self::$armed ) {
	throw new InvalidArgumentException( "Property \"$name\" on object of class " . get_class( $this ) .
	" is undeclared" );
	} else {
	$this->$name = $value;
	}
	}
	}