責任鏈模式就是指每個處理人決定它能處理哪些命令物件，當它無權處理時會把命令物件交下一個處理人，以下是php 實現責任鏈模式的程式碼

trait ResponsibilityMode
{
    protected $_level;
    protected $_nxt;
    //維持所有在責任鏈中的物件的權柄及其class name
    protected $_map = array(
        1 => 'Board',
        2 => 'Admin',
        3 => 'SuperAdmin',
        4 => 'Police'
 

    );
    public final function __construct($level, $nxt) {
    	//當前物件的Level
        $this->_level = $level;
        //當前物件的下一個物件的class name
        $this->_nxt  = $this->_map[$nxt] ?? "";
    }
    public final function process($lv = 1) {
    	//判斷當前物件的權柄是否能夠處理
        if ($lv <=
 
 $this->_level) {
            echo $this->_map[$this->_level] . ' is processing this issue' . PHP_EOL;
        } else {
        	//如果沒人能處理
        	if ($this->_nxt === "") {
        		echo "sorry nobody can handle this issue!!!!";
        		exit;
			}
			//當前的權柄不夠，交給下一個人處理
 

            $nxtCls = new $this->_nxt($this->_level + 1, $this->_level + 2);
            $nxtCls->process($lv);
        }
    }
}
class Board{use ResponsibilityMode;}
class Admin{use ResponsibilityMode;}
class SuperAdmin{use ResponsibilityMode;}
class Police{use ResponsibilityMode;}
$b = new SuperAdmin(3, 4);
$b->process(4);

結果：