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run code in 300+ PHP versions simultaneously
<?php $_ = serialize($GLOBALS); $_G = unserialize($_); echo serialize($_G["GLOBALS"]) . "\n\n"; echo serialize($GLOBALS["GLOBALS"]);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "GLOBALS" in /in/FAZYu on line 9 N; Warning: Undefined global variable $GLOBALS in /in/FAZYu on line 10 N;

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