Руководство по PHP
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is_a

(PHP 4 >= 4.2.0)

is_a --  Returns TRUE if the object is of this class or has this class as one of its parents

Description

bool is_a ( object object, string class_name)

This function returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.

See also get_class(), get_parent_class(), and is_subclass_of().

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get_parent_classУровень вышеis_subclass_of