3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Test { function run() { $this->arr = array('item'); var_dump(key($this->arr)); // dumps 0 // this unexpectedly advances the internal array pointer foreach ($this->getArr() as $v) {} var_dump(key($this->arr)); // dumps NULL } function getArr() { // is NOT returned by reference return $this->arr; } } $test = new Test; $test->run();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Deprecated: Creation of dynamic property Test::$arr is deprecated in /in/FlKBC on line 7 int(0) int(0)
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 Deprecated: Creation of dynamic property Test::$arr is deprecated in /in/FlKBC on line 7 int(0) int(0)
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
int(0) int(0)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
int(0) NULL
preferences:
270.59 ms | 403 KiB | 456 Q