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run code in 300+ PHP versions simultaneously
<?php $x = "foo"; $doc = <<<HERE ${<<<HERE x HERE } HERE; var_dump($doc);
Output for 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/d5IEO on line 6 string(3) "foo"
Output for 5.3.0 - 5.3.29, 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 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
string(3) "foo"
Output for 4.4.3 - 4.4.9, 5.1.0 - 5.1.1, 5.1.3 - 5.1.6, 5.2.0 - 5.2.2, 5.2.6 - 5.2.17
Parse error: syntax error, unexpected $end in /in/d5IEO on line 11
Process exited with code 255.
Output for 5.2.3 - 5.2.5
string(7) "foo HER"
Output for 4.4.2, 5.1.2
Parse error: syntax error, unexpected $end in /in/d5IEO on line 12
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected $ in /in/d5IEO on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/d5IEO on line 11
Process exited with code 255.

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