3v4l.org

run code in 300+ PHP versions simultaneously
<?php print_r(array(1=>’value1’, ‘1’=>’value2’));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "’value1’" in /in/UHAgK:2 Stack trace: #0 {main} thrown in /in/UHAgK on line 2
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant ’value1’ - assumed '’value1’' (this will throw an Error in a future version of PHP) in /in/UHAgK on line 2 Warning: Use of undefined constant ‘1’ - assumed '‘1’' (this will throw an Error in a future version of PHP) in /in/UHAgK on line 2 Warning: Use of undefined constant ’value2’ - assumed '’value2’' (this will throw an Error in a future version of PHP) in /in/UHAgK on line 2 Array ( [1] => ’value1’ [‘1’] => ’value2’ )
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25
Notice: Use of undefined constant ’value1’ - assumed '’value1’' in /in/UHAgK on line 2 Notice: Use of undefined constant ‘1’ - assumed '‘1’' in /in/UHAgK on line 2 Notice: Use of undefined constant ’value2’ - assumed '’value2’' in /in/UHAgK on line 2 Array ( [1] => ’value1’ [‘1’] => ’value2’ )

preferences:
200.97 ms | 403 KiB | 241 Q