<?php

$input = "one two three";
print "$input => ".expand_to_sphinx_query($input)."\n\n";

$input = "one two three four";
print "$input => ".expand_to_sphinx_query($input)."\n\n";

$input = "one two";
print "$input => ".expand_to_sphinx_query($input)."\n\n";

$input = "one";
print "$input => ".expand_to_sphinx_query($input)."\n\n";


function expand_to_sphinx_query($input) {
        $words = explode(" ",$input);

        if (count($words) < 2) {
                return $input;
        }

        $bits = array();

        for($q=0;$q<count($words)-1;$q++) {
                $new = $words[$q].' '.$words[$q+1];
                $bits[] = "\"$new\"~2";
                $bits[] = "\"$new\"~50";
                $bits[] = "\"$new\"";
        }

        if (count($words) > 2)
                $bits[] = "\"$input\"";
        $bits[] = "($input)";

        return implode(' | ',$bits);
}