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<?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);
Output for 8.1.0 - 8.1.9
bool(true) bool(true)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.22
bool(false) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34
bool(true) bool(false)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/NLZNm on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/NLZNm on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/NLZNm on line 3
Process exited with code 255.

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