<?php $input = '1234567'; $array = ['1', '12', '123', '1234', '456', '56', '7', '3456', '234567']; $results = []; foreach ($array as $data) { if (strpos($input, $data) === 0) { $results[strlen($data)][] = $data; } } krsort($results); // best results - you can use foreach to scroll them all var_dump($results); // pick the best result echo current($results)[0]; // 1234
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