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$str = "��������a������������";

if (preg_match("/^[0-9]+$/", $str)) {
    echo "���ׂĔ��p�����ł���";
} else {
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}

?>

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function is_num($text) {
    if (preg_match("/^[0-9]+$/",$text)) {
        return TRUE;
    } else {
        return FALSE;
    }
}

?>

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