3v4l.org

run code in 500+ PHP versions simultaneously
<?php $n = "66288484664777839292466735359294353535658376759494957"; echo bcsqrt(bcsqrt($n, 50), 50);
Output for git.master_jit, git.master
16045731578601.85019141853300512572097366953669020982268872835248

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