# 第十五課 php5.3+新特性 **const 關鍵字可用來在類外定義常量 5.3** const HI="定義常量另一種方法"; **nowdoc傳遞一段代碼不解析變量,類似heredoc5.3** ``` <pre class="calibre14">``` $str <span class="token">=</span> <span class="token"><</span><span class="token"><</span><span class="token"><</span><span class="token4">'EOD'</span> 這里可以是代碼$qq不解析 EOD<span class="token2">;</span> echo $str<span class="token2">;</span> ``` ``` **命名空間5.3** ``` <pre class="calibre14">``` namespace A<span class="token2">;</span> class <span class="token1">B</span><span class="token2">{</span> <span class="token2">}</span> $c <span class="token">=</span> <span class="token5">new</span> <span class="token1"><span class="token2">\</span>A<span class="token2">\</span>B</span><span class="token2">(</span><span class="token2">)</span><span class="token2">;</span> ``` ``` **短數組5.4** ``` <pre class="calibre14">``` $arr <span class="token">=</span> <span class="token2">[</span><span class="token4">"key"</span> <span class="token">=</span><span class="token">></span> <span class="token4">"value"</span><span class="token2">,</span> <span class="token4">"key2"</span> <span class="token">=</span><span class="token">></span> <span class="token4">"value2"</span><span class="token2">]</span><span class="token2">;</span> $arr <span class="token">=</span> <span class="token2">[</span><span class="token3">1</span><span class="token2">,</span><span class="token3">2</span><span class="token2">,</span><span class="token3">3</span><span class="token2">,</span><span class="token3">4</span><span class="token2">]</span><span class="token2">;</span> ``` ``` **函數返回數組5.4** myfunc()\[0\]; **實例化訪問類成員5.4** (new Foo)->bar(); **json不轉換中文5.4** json\_encode(array("中文"), JSON\_UNESCAPED\_UNICODE); **函數中傳遞引用** ``` <pre class="calibre14">``` <span class="token5">function</span> <span class="token1">goo</span><span class="token2">(</span><span class="token">&</span>$a<span class="token2">)</span> <span class="token2">{</span> <span class="token5">return</span> $a <span class="token">=</span> <span class="token3">100</span><span class="token2">;</span> <span class="token2">}</span> $a <span class="token">=</span> <span class="token3">3</span><span class="token2">;</span> echo <span class="token1">goo</span><span class="token2">(</span>$a<span class="token2">)</span><span class="token2">;</span><span class="token6">//輸出100</span> ``` ``` always\_populate\_raw\_post\_data = -1 5.6報錯