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27. extends(繼承)

PHP(2015-10)
============

The `<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">static</span>` keyword lets you use a class' property or method without having to create an instance of that class. It works like this:

```
<pre style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(197, 200, 198); border-radius: 2px; padding: 7px 10px; font-size: 15px; line-height: 22px; background-color: rgb(35, 44, 49);">
```
<span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">class</span></span> Person {
  <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">public</span></span> <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">static</span></span> <span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$isAlive</span></span> = <span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 189, 104);"><span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">"Yep!"</span></span>
  <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">public</span></span> <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">static</span></span> <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">function</span></span> greet() {
    <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">echo</span></span> <span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 189, 104);"><span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">"Hello there!"</span></span>;
  }
}

```<span class="keyword" style="font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">echo</span></span><span style="font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; background-color: rgba(0, 0, 0, 0.0470588);"> Person::</span><span class="variable" style="font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$isAlive</span></span><span style="font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; background-color: rgba(0, 0, 0, 0.0470588);">;/
</span><span style="color: rgb(150, 152, 150); font-style: italic; font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; background-color: rgba(0, 0, 0, 0.0470588);">/ prints "Yep!"
</span><span style="font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; background-color: rgba(0, 0, 0, 0.0470588);">Person::greet();
</span><span style="color: rgb(150, 152, 150); font-style: italic; font-family: Monaco, Menlo, 'Ubuntu Mono', Consolas, source-code-pro, monospace; font-size: 0.85em; line-height: 1.5; white-space: pre-wrap; background-color: rgba(0, 0, 0, 0.0470588);">// prints "Hello there!"</span>
```

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