构造语句中的函数

if (!formatPhone($phone) && !empty($phone)) {
    $e = 1;
    $e_message .= \'<li>The phone number is invalid, please use the format (000) 000-0000.</li>\';
} else {
    $phone = formatPhone($phone);
}

formatePhone()

return false;

if ( !empty($phone) and !($phone = formatPhone($phone)) ) {
    $e = 1;
    $e_message .= \'<li>The phone number is invalid, please use the format (000) 000-0000.</li>\';
}

$phone = formatPhone($phone) or $phone = $default_value;

formatPhone()

$default_value

formatPhone()

$phone