<?php $sequences = ["6", "66", "67", "68", "69", "697", "698", "699"]; $data = ["69212345", "6209876544", "697986546"]; function get_longest_subsequence_element(array $sequences, $str){ $longestSequence = ""; for($strPosition = 0, $strPositionEnd = strlen($str) - 1; $strPosition < $strPositionEnd; $strPosition++){ for($strLength = 1, $strLengthEnd = strlen($str) - $strPosition; $strLength < $strLengthEnd; $strLength++){ if(in_array($sequence = substr($str, $strPosition, $strLength), $sequences) && $strLength > strlen($longestSequence)) $longestSequence = $sequence; } } return $longestSequence; } foreach($data as $str) echo get_longest_subsequence_element($sequences, $str) . "<br>"; ?>
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