<?php $str = '_10_1_18_4_9_14_ _'; $letters = str_repeat('A', substr_count($str, '_')); $limit = 100; for ($i = 0; $i < $limit; $i++) { echo interpolate($str, str_split($letters)), PHP_EOL; $letters++; } function interpolate($str, $letters) { while (($pos = strpos($str, '_')) !== false) { $str[$pos] = array_shift($letters); } return $str; }
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