array_udiff
用回调函数比较数据来计算数组的差集
简体中文
简体中文
比较两个数组的键值（使用用户自定义函数比较键值），并返回差集：
<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">$result</span><span class="token operator">=</span><span class="token function"></span><mark><span class="token function">array_udiff</span><span class="token punctuation">(</span><span class="token variable">$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>
比较三个数组的键值（使用用户自定义函数比较键值），并返回差集：
<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">$a1</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span><span class="token operator">=></span><span class="token string double-quoted-string">"red"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"b"</span><span class="token operator">=></span><span class="token string double-quoted-string">"green"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"c"</span><span class="token operator">=></span><span class="token string double-quoted-string">"blue"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"yellow"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$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">"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">"yellow"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"black"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$a3</span><span class="token operator">=</span><span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"a"</span><span class="token operator">=></span><span class="token string double-quoted-string">"green"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"b"</span><span class="token operator">=></span><span class="token string double-quoted-string">"red"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"yellow"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"black"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token variable">$result</span><span class="token operator">=</span><span class="token function"></span><mark><span class="token function">array_udiff</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>
array_search
array_uintersect_assoc
array_map
uasort
array_column
current
array_product
array_unshift
