<?php
 
// your code goes here
$wall_text = 'Помощь';
if (preg_match('/Помощь/i', $wall_text)) {
    $text = random (array('Что','Какие команды','Ты о чем'));
    echo $text;
}elseif (preg_match('/Привет/i', $wall_text)) {
    $text = 'Привет';
}elseif(preg_match('/Как дела/i', $wall_text)) {
    $text = ("да ну нахуй");
 
}
 
function random($text){
$rand = mt_rand (0, count($text)-1); 
return $text[$rand]; 
}

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