如何结合 is_bool 和 array_filter 查找数组中的布尔值？PHP 示例讲解

gitbox 2025-09-09

如何结合 is_bool 和 array_filter 查找数组中的布尔值？PHP 示例讲解

在 PHP 中，is_bool 函数可以用来检查变量是否为布尔值，而 array_filter 函数可以根据指定的回调函数过滤数组中的元素。结合这两者，我们可以轻松地从数组中筛选出布尔值元素。

1. 了解 is_bool 和 array_filter

is_bool(): 用于检查给定的变量是否是布尔类型。它返回 true 如果变量是布尔值（true 或 false），否则返回 false。

<span><span><span class="hljs-title function_ invoke__">var_dump</span></span><span>(</span><span><span class="hljs-title function_ invoke__">is_bool</span></span><span>(</span><span><span class="hljs-literal">true</span></span><span>));  </span><span><span class="hljs-comment">// bool(true)</span></span><span>
</span><span><span class="hljs-title function_ invoke__">var_dump</span></span><span>(</span><span><span class="hljs-title function_ invoke__">is_bool</span></span><span>(</span><span><span class="hljs-number">1</span></span><span>));     </span><span><span class="hljs-comment">// bool(false)</span></span><span>
</span></span>

array_filter(): 这个函数用于过滤数组中的元素。它接收两个参数：一个是要过滤的数组，另一个是一个回调函数。回调函数的作用是决定哪些元素需要保留，哪些需要删除。如果回调函数返回 true，该元素就会被保留下来；如果返回 false，则会被移除。

<span><span><span class="hljs-variable">$arr</span></span><span> = [</span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">2</span></span><span>, </span><span><span class="hljs-number">3</span></span><span>, </span><span><span class="hljs-number">4</span></span><span>, </span><span><span class="hljs-number">5</span></span><span>];
</span><span><span class="hljs-variable">$filtered</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_filter</span></span><span>(</span><span><span class="hljs-variable">$arr</span></span><span>, function(</span><span><span class="hljs-variable">$value</span></span><span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-variable">$value</span></span><span> &gt; </span><span><span class="hljs-number">2</span></span><span>;
});
</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$filtered</span></span><span>);  </span><span><span class="hljs-comment">// 输出 [3, 4, 5]</span></span><span>
</span></span>

2. 结合使用 is_bool 和 array_filter

通过结合 is_bool 和 array_filter，我们可以从数组中筛选出所有布尔值元素。我们可以通过一个简单的回调函数来检查每个元素是否是布尔值，若是布尔值，则将该元素保留下来。

示例：从数组中过滤出布尔值

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 示例数组</span></span><span>
</span><span><span class="hljs-variable">$array</span></span><span> = [</span><span><span class="hljs-literal">true</span></span><span>, </span><span><span class="hljs-literal">false</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-string">"hello"</span></span><span>, </span><span><span class="hljs-literal">null</span></span><span>, </span><span><span class="hljs-literal">true</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-literal">false</span></span><span>];

</span><span><span class="hljs-comment">// 使用 array_filter 和 is_bool 结合来筛选布尔值</span></span><span>
</span><span><span class="hljs-variable">$filteredArray</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_filter</span></span><span>(</span><span><span class="hljs-variable">$array</span></span><span>, function(</span><span><span class="hljs-variable">$value</span></span><span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-title function_ invoke__">is_bool</span></span><span>(</span><span><span class="hljs-variable">$value</span></span><span>);  </span><span><span class="hljs-comment">// 仅保留布尔值</span></span><span>
});

</span><span><span class="hljs-comment">// 打印结果</span></span><span>
</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$filteredArray</span></span><span>);
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

结果输出：

<span><span>Array
(
    [</span><span><span class="hljs-meta">0</span></span><span>] =&gt; </span><span><span class="hljs-number">1</span></span><span>
    [</span><span><span class="hljs-meta">1</span></span><span>] =&gt; 
    [</span><span><span class="hljs-meta">5</span></span><span>] =&gt; </span><span><span class="hljs-number">1</span></span><span>
    [</span><span><span class="hljs-meta">7</span></span><span>] =&gt; 
)
</span></span>

在这个例子中，array_filter 会遍历 $array 数组中的所有元素，只有那些是布尔值（true 或 false）的元素会被保留下来。注意，array_filter 会保留原始数组的键。

3. 处理数组的键

array_filter 默认会保留数组原有的键。如果你希望过滤后得到的数组键是连续的，可以使用 array_values 函数来重新索引数组。

示例：重新索引键

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-variable">$array</span></span><span> = [</span><span><span class="hljs-literal">true</span></span><span>, </span><span><span class="hljs-literal">false</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-string">"hello"</span></span><span>, </span><span><span class="hljs-literal">null</span></span><span>, </span><span><span class="hljs-literal">true</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-literal">false</span></span><span>];

</span><span><span class="hljs-comment">// 过滤布尔值并重新索引键</span></span><span>
</span><span><span class="hljs-variable">$filteredArray</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_values</span></span><span>(</span><span><span class="hljs-title function_ invoke__">array_filter</span></span><span>(</span><span><span class="hljs-variable">$array</span></span><span>, function(</span><span><span class="hljs-variable">$value</span></span><span>) {
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-title function_ invoke__">is_bool</span></span><span>(</span><span><span class="hljs-variable">$value</span></span><span>);  // 仅保留布尔值
}));

</span><span><span class="hljs-comment">// 打印结果</span></span><span>
</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$filteredArray</span></span><span>);
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>

结果输出：

<span><span>Array
(
    [</span><span><span class="hljs-meta">0</span></span><span>] =&gt; </span><span><span class="hljs-number">1</span></span><span>
    [</span><span><span class="hljs-meta">1</span></span><span>] =&gt; 
    [</span><span><span class="hljs-meta">2</span></span><span>] =&gt; </span><span><span class="hljs-number">1</span></span><span>
    [</span><span><span class="hljs-meta">3</span></span><span>] =&gt; 
)
</span></span>

通过 array_values，我们得到了一个新的数组，其键从 0 开始，并且依然保留了所有的布尔值。

4. 总结

通过结合使用 is_bool 和 array_filter，我们可以方便地从数组中筛选出所有布尔值元素。array_filter 提供了灵活的过滤功能，而 is_bool 则能准确判断一个元素是否是布尔类型。这种方式非常适合在处理数据时需要精确筛选布尔值的场景。

在实际开发中，了解和掌握这些内置函数的配合使用，将会帮助你高效地处理数组数据。

相关标签:
array_filter