extract

实例

例子 1

将键值 "Cat"、"Dog" 和 "Horse" 赋值给变量 $a、$b 和 $c：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Original"</span><span class="token punctuation">;</span>
<span class="token variable">$my_array</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Cat"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Dog"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Horse"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function"></span><mark><span class="token function">extract</span><span class="token punctuation">(</span><span class="token variable">$my_array</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"\$a = <span class="token interpolation"><span class="token variable">$a</span></span>; \$b = <span class="token interpolation"><span class="token variable">$b</span></span>; \$c = <span class="token interpolation"><span class="token variable">$c</span></span>"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 2

使用所有参数：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$a</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Original"</span><span class="token punctuation">;</span>
<span class="token variable">$my_array</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Cat"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"b"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Dog"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"c"</span> <span class="token operator">=></span> <span class="token string double-quoted-string">"Horse"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token function"></span><mark><span class="token function">extract</span><span class="token punctuation">(</span><span class="token variable">$my_array</span><span class="token punctuation">,</span> <span class="token constant">EXTR_PREFIX_SAME</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"dup"</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">;</span>

<span class="token keyword">echo</span> <span class="token string double-quoted-string">"\$a = <span class="token interpolation"><span class="token variable">$a</span></span>; \$b = <span class="token interpolation"><span class="token variable">$b</span></span>; \$c = <span class="token interpolation"><span class="token variable">$c</span></span>; \$dup_a = <span class="token interpolation"><span class="token variable">$dup_a</span></span>"</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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