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Name Description
is_null() Returns true if the value is null (no type)
is_string() Returns true if the value is a string
is_int() Returns true if the value is an integer
is_float() Returns true if the value is a floating-point value
is_array() Returns true if the value is an array
is_object() Returns true if the value is an object
is_a() Deprecated; checks if an object is a specified class
instanceof() Checks if an object is an instance of a class
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