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@ 2015-11-19T10:16:28Z

<?php

function p($x) {
    echo "x";
    if (x<= 2) {
        return 2;
    } else {
        return p(x-1)+p(x-2) -1;
    }
}

var_dump(p(p(5)));

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

60.45 ms | 402 KiB | 5 Q