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SJS PHP Class: Release 1.0
10-13-2008
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IS_A(3) 1 IS_A(3) is_a - Checks if the object is of this class or has this class as one of its parents SYNOPSIS
bool is_a FALSE (object $object, string $class_name, [bool $allow_string]) DESCRIPTION
Checks if the given $object is of this class or has this class as one of its parents. PARAMETERS
o $object - The tested object o $class_name - The class name o $allow_string - If this parameter set to FALSE, string class name as $object is not allowed. This also prevents from calling autoloader if the class doesn't exist. RETURN VALUES
Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.9 | | | | | | | Added $allow_string parameter | | | | | 5.3.0 | | | | | | | This function is no longer deprecated, and will | | | therefore no longer throw E_STRICT warnings. | | | | | 5.0.0 | | | | | | | This function became deprecated in favour of the | | | instanceof operator. Calling this function will | | | result in an E_STRICT warning. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 is_a(3) example <?php // define a class class WidgetFactory { var $oink = 'moo'; } // create a new object $WF = new WidgetFactory(); if (is_a($WF, 'WidgetFactory')) { echo "yes, $WF is still a WidgetFactory "; } ?> Example #2 Using the instanceof operator in PHP 5 <?php if ($WF instanceof WidgetFactory) { echo 'Yes, $WF is a WidgetFactory'; } ?> SEE ALSO
get_class(3), get_parent_class(3), is_subclass_of(3). PHP Documentation Group IS_A(3)