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@ 2016-03-14T16:06:05Z

<?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>";




?>

Output for git.master, git.master_jit, rfc.property-hooks: 69<br>6<br>697<br>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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