array_intersect_ukey

名称:array_intersect_ukey

分类:数组

所属语言:php

一句话介绍:比较数组，返回交集（只比较键名，使用用户自定义的键名比较函数）。

实例

例子 1

比较两个数组的键名（使用用户自定义函数比较键名），并返回交集：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">function</span> <span class="token function-definition function">myfunction</span><span class="token punctuation">(</span><span class="token variable">$a</span><span class="token punctuation">,</span><span class="token variable">$b</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$a</span><span class="token operator">===</span><span class="token variable">$b</span><span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token variable">$a</span><span class="token operator">></span><span class="token variable">$b</span><span class="token punctuation">)</span><span class="token operator">?</span><span class="token number">1</span><span class="token punctuation">:</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$a1</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span><span class="token operator">=></span><span class="token string double-quoted-string">"red"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"b"</span><span class="token operator">=></span><span class="token string double-quoted-string">"green"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"c"</span><span class="token operator">=></span><span class="token string double-quoted-string">"blue"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$a2</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">"blue"</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">"black"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"e"</span><span class="token operator">=></span><span class="token string double-quoted-string">"blue"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token variable">$result</span><span class="token operator">=</span><span class="token function"></span><mark><span class="token function">array_intersect_ukey</span><span class="token punctuation">(</span><span class="token variable">$a1</span><span class="token punctuation">,</span><span class="token variable">$a2</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"myfunction"</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">;</span>
<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token variable">$result</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 2

比较三个数组的键名（使用用户自定义函数比较键名），并返回交集：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">function</span> <span class="token function-definition function">myfunction</span><span class="token punctuation">(</span><span class="token variable">$a</span><span class="token punctuation">,</span><span class="token variable">$b</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$a</span><span class="token operator">===</span><span class="token variable">$b</span><span class="token punctuation">)</span>
  <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
  <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token variable">$a</span><span class="token operator">></span><span class="token variable">$b</span><span class="token punctuation">)</span><span class="token operator">?</span><span class="token number">1</span><span class="token punctuation">:</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$a1</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span><span class="token operator">=></span><span class="token string double-quoted-string">"red"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"b"</span><span class="token operator">=></span><span class="token string double-quoted-string">"green"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"c"</span><span class="token operator">=></span><span class="token string double-quoted-string">"blue"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$a2</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">"black"</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">"yellow"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"d"</span><span class="token operator">=></span><span class="token string double-quoted-string">"brown"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$a3</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"e"</span><span class="token operator">=></span><span class="token string double-quoted-string">"purple"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"f"</span><span class="token operator">=></span><span class="token string double-quoted-string">"white"</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">"gold"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token variable">$result</span><span class="token operator">=</span><span class="token function"></span><mark><span class="token function">array_intersect_ukey</span><span class="token punctuation">(</span><span class="token variable">$a1</span><span class="token punctuation">,</span><span class="token variable">$a2</span><span class="token punctuation">,</span><span class="token variable">$a3</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"myfunction"</span><span class="token punctuation">)</span></mark><span class="token punctuation"></span><span class="token punctuation">;</span>
<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token variable">$result</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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