Online PHP editor | output for NLZNm

@ 2018-08-10T15:00:17Z

<?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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: bool(true) bool(true)
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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 - 7.4.33, 8.0.0 - 8.0.30: 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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