Online PHP editor | vld for NLZNm

<?php class A { public $a; } class B extends A { public $b; } $a = new B(); $a->a = 0; $a->b = 1; $b = new B(); $b->a = 1; $b->b = 0; // This compare walks the properties_table in both objects directly, // resulting in ->a being compared first. // // Ref: https://github.com/php/php-src/blob/b151e17bdfca573e0205cc90dc710f89d77f03cf/Zend/zend_object_handlers.c#L1517 var_dump($a < $b); // print_r() (or several other potential actions) forces the properties HashTable to be materialized, // It's not the output of this that matters, so ignore it. print_r($a, true); // Now that one of the objects has a materialized HashTable, // we materialize the other and walk that instead. // However, ordering of properties in properties_info // is not (necessarily) the same as in the property slots. // // Ref: https://github.com/php/php-src/blob/b151e17bdfca573e0205cc90dc710f89d77f03cf/Zend/zend_object_handlers.c#L1569 // Ref: https://github.com/php/php-src/blob/b151e17bdfca573e0205cc90dc710f89d77f03cf/Zend/zend_object_handlers.c#L70 var_dump($a < $b);

Finding entry points Branch analysis from position: 0 1 jumps found. (Code = 62) Position 1 = -2 filename: /in/NLZNm function name: (null) number of ops: 27 compiled vars: !0 = $a, !1 = $b line #* E I O op fetch ext return operands ----------------------------------------------------------------------------------------- 5 0 E > NEW $2 'B' 1 DO_FCALL 0 2 ASSIGN !0, $2 3 ASSIGN_OBJ !0, 'a' 4 OP_DATA 0 5 ASSIGN_OBJ !0, 'b' 6 OP_DATA 1 6 7 NEW $7 'B' 8 DO_FCALL 0 9 ASSIGN !1, $7 10 ASSIGN_OBJ !1, 'a' 11 OP_DATA 1 12 ASSIGN_OBJ !1, 'b' 13 OP_DATA 0 12 14 INIT_FCALL 'var_dump' 15 IS_SMALLER ~12 !0, !1 16 SEND_VAL ~12 17 DO_ICALL 16 18 INIT_FCALL 'print_r' 19 SEND_VAR !0 20 SEND_VAL <true> 21 DO_ICALL 25 22 INIT_FCALL 'var_dump' 23 IS_SMALLER ~15 !0, !1 24 SEND_VAL ~15 25 DO_ICALL 26 > RETURN 1 Class A: [no user functions] Class B: [no user functions]