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@ 2013-08-04T21:38:48Z

<?php

header('Content-Type: text/plain');

$s = "abcdefghi";
$p = 4;
$n = 3;

$p1 = $p-1;
$s[$p1] = '';
while(--$n) {
    $s[++$p1] = '';
}
echo $s;

Output
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header: documentation ( source)

preferences:dark modelive preview

55.59 ms | 402 KiB | 5 Q