3v4l.org

run code in 200+ PHP versions simultaneously
<?php //código com o problema function &olaMundoRef(){ return 'Ola mundo'. PHP_EOL; } //código sem problema function &olaMundo(){ $x = 'Ola mundo'; return $x; } echo olaMundoRef(); echo olaMundo();
based on IpDcq
Output for 4.4.0 - 4.4.9, 5.1.0 - 7.3.1
Notice: Only variable references should be returned by reference in /in/ZbXSD on line 4 Ola mundo Ola mundo
Output for 5.0.2 - 5.0.5
Strict Standards: Only variable references should be returned by reference in /in/ZbXSD on line 4 Ola mundo Ola mundo
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/ZbXSD on line 4 Strict Standards: Only variable references should be returned by reference in /in/ZbXSD on line 4 Ola mundoPHP_EOLOla mundo
Output for 4.3.10 - 4.3.11
Ola mundo Ola mundo
Output for 4.3.0 - 4.3.9
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/ZbXSD on line 4 Ola mundoPHP_EOLOla mundo