PHP代码的优化

if ( 1 == $orderState ) {
    $status = 'success';
}else{
    $status = 'error';
} 
return $status;
 
#### 完全可以简化成如下代码
$status = 'error';
if ( 1 == $orderState ) {
    $status = 'success';
} 
return $status;

if ( !empty($_POST['action']) ) {
    $action = $_POST['action'];
}else{
    $action = 'default';
} 
#### 完全可以简化成如下代码
$action = !empty($_POST['action']) ? $_POST['action'] : 'default';

$str = 'this_is_test';
$res = implode('', array_map('ucfirst', explode('_', $str)));
 
#### 完全可以简化成如下代码
$str = 'this_is_test';
$words = explode('_', $str);
$uWords = array_map('ucfirst', $words);
$res = implode(' ', $uWords);