PHP combine arrays on similar elements - php

Question

I have some data in this format:
even--heaped<br />
even--trees<br />
hardrocks-cocked<br />
pebble-temple<br />
heaped-feast<br />
trees-feast<br />
and I want to end up with an output so that all lines with the same words get added to each other with no repeats.
even--heaped--trees--feast<br />
hardrocks--cocked<br />
pebbles-temple<br />
i tried a loop going through both arrays but its not the exact result I want. for an array $thing:
Array ( [0] => even--heaped [1] => even--trees [2] => hardrocks--cocked [3] => pebbles--temple [4] => heaped--feast [5] => trees--feast )
for ($i=0;$i<count($thing);$i++){
for ($j=$i+1;$j<count($thing);$j++){
$first = explode("--",$thing[$i]);
$second = explode("--",$thing[$j]);
$merge = array_merge($first,$second);
$unique = array_unique($merge);
if (count($unique)==3){
$fix = implode("--",$unique);
$out[$i] = $thing[$i]."--".$thing[$j];
}
}
}
print_r($out);
but the result is:
Array ( [0] => even--heaped--heaped--feast [1] => even--trees--trees--feast [4] => heaped--feast--trees--feast )
which is not what i want. Any suggestions (sorry about the terrible variable names).

Answer 1

This might help you:
$in = array(
"even--heaped",
"even--trees",
"hardrocks--cocked",
"pebbles--temple",
"heaped--feast",
"trees--feast"
);
$clusters = array();
foreach( $in as $item ) {
$words = explode("--", $item);
// check if there exists a word in an existing cluster...
$check = false;
foreach($clusters as $k => $cluster) {
foreach($words as $word) {
if( in_array($word, $cluster) ) {
// add the words to this cluster
$clusters[$k] = array_unique( array_merge($cluster, $words) );
$check = true;
break;
}
}
}
if( !$check ) {
// create a new cluster
$clusters[] = $words;
}
}
// merge back
$out = array();
foreach( $clusters as $cluster ) {
$out[] = implode("--", $cluster);
}
pr($out);

Answer 2

Try this code:
<?php
$data = array ("1--2", "3--1", "4--5", "2--6");
$n = count($data);
$elements = array();
for ($i = 0; $i < $n; ++$i)
{
$split = explode("--", $data[$i]);
$word_num = NULL;
foreach($split as $word_key => $word)
{
foreach($elements as $key => $element)
{
if(isset($element[$word]))
{
$word_num = $key;
unset($split[$word_key]);
}
}
}
if(is_null($word_num))
{
$elements[] = array();
$word_num = count($elements) - 1;
}
foreach($split as $word_key => $word)
{
$elements[$word_num][$word] = 1;
}
}
//combine $elements into words
foreach($elements as $key => $value)
{
$words = array_keys($value);
$elements[$key] = implode("--", $words);
}
var_dump($elements);
It uses $elements as an array of hashes to store the individual unique words as keys. Then combines the keys to create appropriate words.
Prints this:
array(2) {
[0]=>
string(10) "1--2--3--6"
[1]=>
string(4) "4--5"
}

Answer 3

Here is a solution with a simple control flow.
<?php
$things = array('even--heaped', 'even--trees', 'hardrocks--cocked',
'pebble--temple', 'heaped--feast' ,'trees--feast');
foreach($things as $thing) {
$str = explode('--', $thing);
$first = $str[0];
$second = $str[1];
$i = '0';
while(true) {
if(!isset($a[$i])) {
$a[$i] = array();
array_push($a[$i], $first);
array_push($a[$i], $second);
break;
} else if(in_array($first, $a[$i]) && !in_array($second, $a[$i])) {
array_push($a[$i], $second);
break;
} else if(!in_array($first, $a[$i]) && in_array($second, $a[$i])) {
array_push($a[$i], $first);
break;
} else if(in_array($first, $a[$i]) && in_array($second, $a[$i])) {
break;
}
$i++;
}
}
print_r($a);
?>

Answer 4

It seems you have already selected user4035's answer as best.
But i feel this one is optimized(Please correct me if i am wrong): eval.in
Code:
$array = Array ( 'even--heaped' , 'even--trees' ,'hardrocks--cocked' , 'pebbles--temple' , 'heaped--feast' , 'trees--feast' );
print "Input: ";
print_r($array);
for($j=0;$j < count($array);$j++){
$len = count($array);
for($i=$j+1;$i < $len;$i++){
$tmp_array = explode("--", $array[$i]);
$pos1 = strpos($array[$j], $tmp_array[0]);
$pos2 = strpos($array[$j], $tmp_array[1]);
if (!($pos1 === false) && $pos2 === false){
$array[$j] = $array[$j] . '--'.$tmp_array[1];unset($array[$i]);
}elseif(!($pos2 === false) && $pos1 === false){
$array[$j] = $array[$j] . '--'.$tmp_array[0];unset($array[$i]);
}elseif(!($pos2 === false) && !($pos1 === false)){
unset($array[$i]);
}
}
$array = array_values($array);
}
print "\nOutput: ";
print_r($array);