3v4l.org

run code in 300+ PHP versions simultaneously
<?php set_error_handler(function($errno, $errstr){ echo "Error handler"; echo "\n"; echo $errstr; }); try { fopen('php://temp/maxmemory:-1', 'w+'); } catch (Throwable $e) { echo "Catch"; }

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34.84 ms | 402 KiB | 5 Q