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run code in 200+ php & hhvm versions
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<?php $time = new DateTime('now'); var_dump($time->format(DateTime::ISO8601));
Output for 5.2.0 - 5.4.41, 5.4.43 - 5.6.38, hhvm-3.10.1 - 3.13.2, hhvm-3.17.3, hhvm-3.18.5, hhvm-3.20.2 - 3.21.0, hhvm-3.22.0, 7.0.0 - 7.3.0rc4
string(24) "2013-10-16T21:56:24+0200"
Output for 5.4.42, hhvm-3.15.4, hhvm-3.18.4, hhvm-3.19.2, hhvm-3.21.3
string(24) "2013-10-16T21:56:25+0200"
Output for 5.0.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/2rtFM on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected ')', expecting '(' in /in/2rtFM on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected ')', expecting '(' in /in/2rtFM on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'('' in /in/2rtFM on line 4
Process exited with code 255.