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@ 2013-11-28T04:34:53Z

<?php

$aa = 'Уважаемые абоненты! Благодарим Вас за обратную связь в нашей Гостевой книге. ';

$b = explode(' ', $aa);

if(isset($b[20])){
    $b[20] = '<span class="qq">'.$b[20];
    $b[] = '</span>';
}

echo implode(' ',$b);

Output
Performance
VLD
References
Branches

implode: documentation ( source)
explode: documentation ( source)

preferences:dark modelive preview

38.03 ms | 402 KiB | 5 Q