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run code in 300+ PHP versions simultaneously
<?php ob_start(); // make sure ob_level is set to 1 function callback() { echo "In php 8.0.0 - 8.0.10, a die statement does prevent the trigger from being outputted: "; die(); } header_register_callback("callback"); ob_end_clean(); echo "Trigger."; echo "Execution died before this echo statement.";

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