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run code in 300+ PHP versions simultaneously
<?php set_error_handler(function($errorNumber, $errorMessage, $file, $line) { debug_print_backtrace(); }); trigger_error('Hello world', E_USER_WARNING);
Output for git.master, git.master_jit, rfc.property-hooks
#0 [internal function]: {closure}(512, 'Hello world', '/in/q2K52', 5) #1 /in/q2K52(5): trigger_error('Hello world', 512)

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