3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo\PHP7; class Foo {} namespace Foo\PHP5; class Foo {} namespace Foo; if (version_compare(PHP_VERSION, '7.0.0', '<')) { echo PHP_VERSION; class_alias('\Foo\PHP5\Foo', '\Foo\Foo'); } else { echo PHP_VERSION; class_alias('\Foo\PHP7\Foo', '\Foo\Foo'); } $a = new \Foo\Foo(); var_Dump(get_class($a));

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