<?php
error_reporting(-1);
$letters = array(
    'ко',   'и',    'дзу',  'ми',
    'са',   'ку',   'ра',   'да',
    'чи',   'а',    'ки',   'ми',
    'на',   'го',   'ха',   'ру'
);
$name = "";
for ($i = 1; $i <= 4; $i++) {   
    /* Выкидываем случайное число (count - число элементов в массиве) */
    $random = mt_rand(1, count($letters)); 
    $randomText = $letters[$random];
    echo "Выпало число {$random}, слог {$randomText}\n";
    $name = $name . $randomText;
}
 
echo "------\n";
echo "Советую имя: {$name} - не прогадаешь!\n";
 

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