php - Find exact same string in multiple strings -

the following example.

i have array :

array (     [0] =>  vlakke lasflenzen pn6     [1] =>  vlakke lasflenzen pn10     [2] =>  vlakke lasflenzen pn16     [3] =>  vlakke lasflenzen pn25-40 ) 

i not know part of strings same. , dont know if pattern stay same. cannot explode() on spaces or something.

what want try extract part of srting same between 4 of them split between spaces.

so example need extract 'vlakke lasflenzen' 4 strings based on compasison of them.

can me?

the problem you're talking called the longest common substring problem.

i found an implementation finding longest common substring in array of strings. mentioned in original post, usage:

<?php $array = array(   'ptt757lp4',   'ptt757a',   'pct757b',   'pct757lp4ev' ); echo longest_common_substring($array); // => t757 ?> 

the relevant code:

function longest_common_substring($words) {   $words = array_map('strtolower', array_map('trim', $words));   $sort_by_strlen = create_function('$a, $b', 'if (strlen($a) == strlen($b)) { return strcmp($a, $b); } return (strlen($a) < strlen($b)) ? -1 : 1;');   usort($words, $sort_by_strlen);   $longest_common_substring = array();   $shortest_string = str_split(array_shift($words));   while (sizeof($shortest_string)) {     array_unshift($longest_common_substring, '');     foreach ($shortest_string $ci => $char) {       foreach ($words $wi => $word) {         if (!strstr($word, $longest_common_substring[0] . $char)) {           // no match           break 2;         } // if       } // foreach       $longest_common_substring[0].= $char;     } // foreach     array_shift($shortest_string);   }   // if made here we've run through   usort($longest_common_substring, $sort_by_strlen);   return array_pop($longest_common_substring); }