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@ 2014-06-20T16:21:42Z

<?php

$input = array(2,7,4,9); // sample input
$words = array(); // main array

foreach($input as $num) { // get letters corresponding to each button pressed
    switch ($num) {
        case 2:
            $letters = array('a','b','c');
            break;
        case 3:
            $letters = array('d','e','f');
            break;
        case 4:
            $letters = array('g','h','i');
            break;
        case 5:
            $letters = array('j','k','l');
            break;
        case 6:
            $letters = array('m','n','o');
            break;
        case 7:
            $letters = array('p','q','r','s');
            break;
        case 8:
            $letters = array('t','u','v');
            break;
        case 9:
            $letters = array('w','x','y','z');
            break;
    }
    array_push($words, $letters); // add array of letters to main array
}

// create all possible combinations of values
foreach($words['0'] as $k0=>$v0) {
    foreach($words['1'] as $k1=>$v1) {
        foreach($words['2'] as $k2=>$v2) {
            foreach($words['3'] as $k3=>$v3) {
                $test = $v0."".$v1."".$v2."".$v3; // form a potential word
                if (isWord($test)) { // pass it to the API isWord
                    echo $test."<br />"; // if return true, print the word
                }
            }
        }
    }
}
?>

Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Error: Call to undefined function isWord() in /in/N1lvO:42 Stack trace: #0 {main} thrown in /in/N1lvO on line 42
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21: Fatal error: Call to undefined function isWord() in /in/N1lvO on line 42
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: isword() in /in/N1lvO on line 42
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: isword() in /in/N1lvO on line 42
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: isword() in /in/N1lvO on line 42

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