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  1. PO
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    <p>** <strong>EDIT</strong> ** : slightly better implementation, now also returns frequences and has a better sequence filter.</p> <pre><code>function getFrequences($input, $minimalSequenceSize = 2) { $sequences = array(); $frequences = array(); $len = count($input); for ($i=0; $i&lt;$len; $i++) { $offset = $i; for ($j=$i+$minimalSequenceSize; $j&lt;$len; $j++) { if ($input[$offset] == $input[$j]) { $sequenceSize = 1; $sequence = array($input[$offset]); while (($offset + $sequenceSize &lt; $j) &amp;&amp; ($input[$offset+$sequenceSize] == $input[$j+$sequenceSize])) { if (false !== ($seqIndex = array_search($sequence, $frequences))) { // we already have this sequence, since we found a bigger one, remove the old one array_splice($sequences, $seqIndex, 1); array_splice($frequences, $seqIndex, 1); } $sequence[] = $input[$offset+$sequenceSize]; $sequenceSize++; } if ($sequenceSize &gt;= $minimalSequenceSize) { if (false !== ($seqIndex = array_search($sequence, $sequences))) { $frequences[$seqIndex]++; } else { $sequences[] = $sequence; $frequences[] = 2; // we have two occurances already } // $i += $sequenceSize; // move $i so we don't reuse the same sub-sequence break; } } } } // remove sequences that are sub-sequence of another frequence // ** comment this to keep all sequences regardless ** $len = count($sequences); for ($i=0; $i&lt;$len; $i++) { $freq_i = $sequences[$i]; for ($j=$i+1; $j&lt;$len; $j++) { $freq_j = $sequences[$j]; $freq_inter = array_intersect($freq_i, $freq_j); if (count($freq_inter) != 0) { $len--; if (count($freq_i) &gt; count($freq_j)) { array_splice($sequences, $j, 1); array_splice($frequences, $j, 1); $j--; } else { array_splice($sequences, $i, 1); array_splice($frequences, $i, 1); $i--; break; } } } } return array($sequences, $frequences); }; </code></pre> <p>Test case</p> <pre><code>header('Content-type: text/plain'); $input = array(3, 5, 1, 3, 5, 48, 4, 7, 13, 55, 3, 5, 65, 4, 7, 13, 32, 5, 48, 4, 7, 13); list($sequences, $frequences) = getFrequences($input); foreach ($sequences as $i =&gt; $s) { echo "(" . implode(',', $s) . ') f=' . $frequences[$i] . "\n"; } </code></pre> <p>** <strong>EDIT</strong> ** : here's an update to the function. It was almost completely rewritten... tell me if this is what you were looking for. I also added a redundancy check to prevent counting the same sequence, or subsequence, twice.</p> <pre><code>function getFrequences2($input, $minSequenceSize = 2) { $sequences = array(); $last_offset = 0; $last_offset_len = 0; $len = count($input); for ($i=0; $i&lt;$len; $i++) { for ($j=$i+$minSequenceSize; $j&lt;$len; $j++) { if ($input[$i] == $input[$j]) { $offset = 1; $sub = array($input[$i]); while ($i + $offset &lt; $j &amp;&amp; $j + $offset &lt; $len) { if ($input[$i + $offset] == $input[$j + $offset]) { array_push($sub, $input[$i + $offset]); } else { break; } $offset++; } $sub_len = count($sub); if ($sub_len &gt;= $minSequenceSize) { // $sub must contain more elements than the last sequence found // otherwise we will count the same sequence twice if ($last_offset + $last_offset_len &gt;= $i + $sub_len) { // we already saw this sequence... ignore continue; } else { // save offset and sub_len for future check $last_offset = $i; $last_offset_len = $sub_len; } foreach ($sequences as &amp; $sequence) { $sequence_len = count($sequence['values']); if ($sequence_len == $sub_len &amp;&amp; $sequence['values'] == $sub) { //echo "Found add-full ".var_export($sub, true)." at $i and $j...\n"; $sequence['frequence']++; break 2; } else { if ($sequence_len &gt; $sub_len) { $end = $sequence_len - $sub_len; $values = $sequence['values']; $slice_len = $sub_len; $test = $sub; } else { $end = $sub_len - $sequence_len; $values = $sub; $slice_len = $sequence_len; $test = $sequence['values']; } for ($k=0; $k&lt;=$end; $k++) { if (array_slice($values, $k, $slice_len) == $test) { //echo "Found add-part ".implode(',',$sub)." which is part of ".implode(',',$values)." at $i and $j...\n"; $sequence['values'] = $values; $sequence['frequence']++; break 3; } } } } //echo "Found new ".implode(',',$sub)." at $i and $j...\n"; array_push($sequences, array('values' =&gt; $sub, 'frequence' =&gt; 2)); break; } } } } return $sequences; }; </code></pre>
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    1. POFinding frequent sequence of numbers in an array
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    1. USYanick Rochon
    1. USYanick Rochon
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POFinding frequent sequence of numbers in an array
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    1. VO
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      1. This table or related slice is empty.
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    2. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
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      1. VTUpMod
    1. COWorked for me. Works well. It even eliminates the duplicated 4,7 and only shows the 4,7,13. Nice work!
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      1. USChuck Burgess
    2. COI found some potential problems and fixed them in this one. The algorithm now also return the frequence for each sequence. Cheers! If you find any error, please tell me so I can update/fix this answer.
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      1. USYanick Rochon
    3. CONice work, But in case of '(1,2,3,4,1,2,3,4,1,2,7,8,7,8,3,4,3,4,1,2)' the output should be '(1,2,3,4)' & '(3,4,1,2)' & '(7,8)' , it gives only (3,4,1,2) & (7,8) to make it clear for you consider each number as a word and you want to find most frequent phrases so it is common to see same word(s) in a lot of phrases but if any phrase was sub-string for any other phrase(s) should not be consider as a phrase but will update frequency of each phrase includes it.
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      1. USD3VELOPER
 

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