PHP為瞭解決自己是弱類型語言在調用方法是傳參類型可能導致的問題,引入了參數提示,看代碼
1 <html> 2 <body> 3 <?php 4 class Man { 5 private $name; 6 7 function getName() { 8 return $this->name; 9 }10 11 function setName($name) {12 $this->name = $name;13 }14 }15 16 class Wrong {}17 18 function callMan(Man $man) {19 echo "Hey " . $man->getName();20 }21 22 $man = new Man();23 $man->setName('Jack');24 25 callMan($man);26 callMan(new Wrong());27 ?>28 </body>29 </html>
再看輸出
Hey Jack
Catchable fatal error: Argument 1 passed to callMan() must be an instance of Man, instance of Wrong given, called in D:\www\index.php on line 26 and defined in D:\www\index.php on line 18
由於callMan()函數傳入參數類型不是Man,導致了catchable fatal error,至此我覺得PHP慢慢變得自相矛盾,許多自己的特性給自己造成了困擾,然後又出新特性來解決原來的問題
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