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run code in 300+ PHP versions simultaneously
<?php var_dump(⁠2 == 2); $a = ⁠2; var_dump(++$a); var_dump($a + 1); var_dump(⁠2 + 1);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Uncaught Error: Undefined constant "⁠2" in /in/0k1aF:3 Stack trace: #0 {main} thrown in /in/0k1aF on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant ⁠2 - assumed '⁠2' (this will throw an Error in a future version of PHP) in /in/0k1aF on line 3 bool(false) Warning: Use of undefined constant ⁠2 - assumed '⁠2' (this will throw an Error in a future version of PHP) in /in/0k1aF on line 5 string(4) "⁠3" Warning: A non-numeric value encountered in /in/0k1aF on line 7 int(1) Warning: Use of undefined constant ⁠2 - assumed '⁠2' (this will throw an Error in a future version of PHP) in /in/0k1aF on line 9 Warning: A non-numeric value encountered in /in/0k1aF on line 9 int(1)
Output for 7.1.0 - 7.1.20
Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 3 bool(false) Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 5 string(4) "⁠3" Warning: A non-numeric value encountered in /in/0k1aF on line 7 int(1) Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 9 Warning: A non-numeric value encountered in /in/0k1aF on line 9 int(1)
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, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 3 bool(false) Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 5 string(4) "⁠3" int(1) Notice: Use of undefined constant ⁠2 - assumed '⁠2' in /in/0k1aF on line 9 int(1)

preferences:
186.57 ms | 404 KiB | 314 Q