如何在PHP中链接方法? [英] How do I chain methods in PHP?

问题描述

jQuery使我可以链接方法.我还记得在PHP中看到过同样的东西，所以我这样写:

jQuery lets me chain methods. I also remember seeing the same in PHP so I wrote this:

class cat {
 function meow() {
 echo "meow!";
 }

function purr() {
 echo "purr!";
 }
}

$kitty = new cat;

$kitty->meow()->purr();

我无法使链条正常工作.喵叫后立即产生致命错误.

I cannot get the chain to work. It generates a fatal error right after the meow.

推荐答案

要回答您的cat示例，您的cat方法需要返回$this，这是当前的对象实例.然后，您可以链接方法:

To answer your cat example, your cat's methods need to return $this, which is the current object instance. Then you can chain your methods:

class cat {
 function meow() {
  echo "meow!";
  return $this;
 }

 function purr() {
  echo "purr!";
  return $this;
 }
}

现在您可以这样做:

$kitty = new cat;
$kitty->meow()->purr();

有关该主题的非常有用的文章，请参见此处:

For a really helpful article on the topic, see here: http://www.talkphp.com/advanced-php-programming/1163-php5-method-chaining.html

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