推入作為對象屬性的數組的正確方法是什么？

Question

推入作為對象屬性的數組的正確方法是什么？

錯誤：

Fatal error: Cannot use [] for reading in ... on line ..

碼：

class StreamResponse 
{
  public  $messages ;

  function __construct($post) 
  {
    $strippost = stripslashes_deep( $_POST );    
    foreach ($strippost['messages'] as $message) 
    {
      $m = json_decode($message, true);
      $this->$messages[] = $m; //<-- This line is the line with the issue
    }
  }
}

Answer 1

當你使用$this時，不要在messages之前使用美元符號

$this->messages[] = $m;