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run code in 500+ PHP versions simultaneously
<?php namespace Crell\Serde { if (!class_exists(Serde::class)) { abstract class Serde {} } } namespace { use Crell\Serde\Serde; class Expression extends Serde {} }
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7

preferences:
60.66 ms | 990 KiB | 4 Q