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@

<?php

function foo() {
    $a = 1;
    $b = 2;
    $c = 3;
    $d = 4;
    for ($i = $a; $i <= $d; $i++){
        echo $i;
    }
}

foo();

eol versions

Output
Performance
VLD opcodes
References
Segmentation fault
RFC branches

Output for 4.3.0 - 7.2.0: 1234