Find most repeated sub strings in array

Question

I have an array:

$myArray=array(

'hello my name is richard',
'hello my name is paul',
'hello my name is simon',
'hello it doesn\'t matter what my name is'

);

I need to find the sub string (min 2 words) that is repeated the most often, maybe in an array format, so my return array could look like this:

$return=array(

array('hello my', 3),
array('hello my name', 3),
array('hello my name is', 3),
array('my name', 4),
array('my name is', 4),
array('name is', 4),

);

So I can see from this array of arrays how often each string was repeated amongst all strings in the array.

Is the only way to do it like this?..

function repeatedSubStrings($array){

    foreach($array as $string){
        $phrases=//Split each string into maximum number of sub strings
        foreach($phrases as $phrase){
            //Then count the $phrases that are in the strings
        }
    }

}

I've tried a solution similar to the above but it was too slow, processing around 1000 rows per second, can anyone do it faster?

Answer 1

A solution to this might be

function getHighestRecurrence($strs){

  /*Storage for individual words*/
  $words = Array();

  /*Process multiple strings*/
  if(is_array($strs))
      foreach($strs as $str)
         $words = array_merge($words, explode(" ", $str));

 /*Prepare single string*/
  else
      $words = explode(" ",$strs);

  /*Array for word counters*/
  $index = Array();

  /*Aggregate word counters*/
  foreach($words as $word)

          /*Increment count or create if it doesn't exist*/
          (isset($index[$word]))? $index[$word]++ : $index[$word] = 1;


  /*Sort array hy highest value and */
  arsort($index);

  /*Return the word*/
  return key($index);
}

Answer 2

While this has a higher runtime, I think it's simpler from an implementation perspective:

$substrings = array();

foreach ($myArray as $str)
{
    $subArr = explode(" ", $str);
    for ($i=0;$i<count($subArr);$i++)
    {
        $substring = "";
        for ($j=$i;$j<count($subArr);$j++)
        {
            if ($i==0 && ($j==count($subArr)-1))
                break;      
            $substring = trim($substring . " " . $subArr[$j]);
            if (str_word_count($substring, 0) > 1)
            {
                if (array_key_exists($substring, $substrings))
                    $substrings[$substring]++;
                else
                    $substrings[$substring] = 1;
            }
        }
    }   
}

arsort($substrings);
print_r($substrings);