Question

How to check if an object is a child of parent class with is_subclass_of() function in PHP

Answer 1

class test {
    var $t;
}
    
class child1 extends test {
    var $c;    
}

$test_obj = new test();
$child1_obj = new child1();
   
if (is_subclass_of($test_obj, 'test')) 
    echo "\$test_obj is a subclass of test <br />";
else 
    echo "\$test_obj is NOT a subclass of test <br />";

   
if (is_subclass_of($child1_obj, 'test')) 
    echo "\$child1_obj is a subclass of test <br />";
else 
    echo "\$child1_obj is NOT a subclass of test <br />";

/*
run:
 
$test_obj is NOT a subclass of test
$child1_obj is a subclass of test  
    
*/

 

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