3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo {} function bar() { static $i = 0; return ++$i; } function &refBar() { static $j = 0; $j++; return $j; } new Foo(bar()); new Foo(refBar()); $sprintf = sprintf("Sprintf: %d", bar()); $sprintf = sprintf("Sprintf: %d", refBar()); echo "Did call bar " . bar() . " times\n"; echo "Did call refBar " . refBar() . " times\n";
Output for 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Did call bar 3 times Did call refBar 3 times
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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20
Did call bar 2 times Did call refBar 2 times

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