Give this function a phrase and it will return all of the permutations of the words that make up the phrase.
function wordperms($phrase,$top='') {
$output = array();
if (is_array($phrase)) {
$phrase_pieces = $phrase;
}
else {
$phrase_pieces = explode(' ',$phrase);
}
$top_pieces = explode(' ',$top);
foreach ($phrase_pieces as $piece) {
if (!in_array($top.$piece,$output) && !in_array($piece,$top_pieces)) {
$output[] = $top.$piece;
$output = array_merge($output,wordperms($phrase_pieces,$top.$piece.' '));
}
}
return $output;
}
// example
print_r(wordperms("three word phrase"));
/*
Array
(
[0] => three
[1] => three word
[2] => three word phrase
[3] => three phrase
[4] => three phrase word
[5] => word
[6] => word three
[7] => word three phrase
[8] => word phrase
[9] => word phrase three
[10] => phrase
[11] => phrase three
[12] => phrase three word
[13] => phrase word
[14] => phrase word three
)
*/
$output = array();
if (is_array($phrase)) {
$phrase_pieces = $phrase;
}
else {
$phrase_pieces = explode(' ',$phrase);
}
$top_pieces = explode(' ',$top);
foreach ($phrase_pieces as $piece) {
if (!in_array($top.$piece,$output) && !in_array($piece,$top_pieces)) {
$output[] = $top.$piece;
$output = array_merge($output,wordperms($phrase_pieces,$top.$piece.' '));
}
}
return $output;
}
// example
print_r(wordperms("three word phrase"));
/*
Array
(
[0] => three
[1] => three word
[2] => three word phrase
[3] => three phrase
[4] => three phrase word
[5] => word
[6] => word three
[7] => word three phrase
[8] => word phrase
[9] => word phrase three
[10] => phrase
[11] => phrase three
[12] => phrase three word
[13] => phrase word
[14] => phrase word three
)
*/
