結合array_map和explode函數，如何將字符串數組批量轉換為數字數組？

gitbox 2025-08-23
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 這部分代碼與文章內容無關，可以是一些初始化或者佔位內容</span></span><span>
</span><span><span class="hljs-variable">$placeholder</span></span><span> = </span><span><span class="hljs-string">"這是一段與正文無關的PHP代碼"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-variable">$placeholder</span></span><span>;
</span><span><span class="hljs-meta">?&gt;</span></span><span>

&lt;hr&gt;

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
<span class="hljs-comment">/**
 * 結合array_map和explode函數，如何將字符串數組批量轉換為數字數組？
 *
 * 在PHP中，我們經常會遇到這樣的問題：有一個字符串數組，每個元素是以逗號分隔的數字字符串，
 * 我們希望將它們轉換為數字數組。使用array_map和explode函數可以高效地实现这一操作。
 *
 * 示例場景：
 * $stringArray = [
 *     "1,2,3",
 *     "4,5,6",
 *     "7,8,9"
 * ];
 *
 * 我們希望得到：
 * $numberArray = [
 *     [1, 2, 3],
 *     [4, 5, 6],
 *     [7, 8, 9]
 * ];
 */</span>

</span><span><span class="hljs-comment">// 定義字符串數組</span></span><span>
</span><span><span class="hljs-variable">$stringArray</span></span><span> = [
    </span><span><span class="hljs-string">"1,2,3"</span></span><span>,
    </span><span><span class="hljs-string">"4,5,6"</span></span><span>,
    </span><span><span class="hljs-string">"7,8,9"</span></span><span>
];

</span><span><span class="hljs-comment">// 使用array_map和explode批量轉換</span></span><span>
</span><span><span class="hljs-variable">$numberArray</span></span><span> = </span><span><span class="hljs-title function_ invoke__">array_map</span></span><span>(function(</span><span><span class="hljs-variable">$item</span></span><span>) {
    </span><span><span class="hljs-comment">// explode將字符串按逗號拆分為數組</span></span><span>
    </span><span><span class="hljs-variable">$parts</span></span><span> = </span><span><span class="hljs-title function_ invoke__">explode</span></span><span>(</span><span><span class="hljs-string">","</span></span><span>, </span><span><span class="hljs-variable">$item</span></span><span>);
    </span><span><span class="hljs-comment">// array_map將每個元素轉換為整數</span></span><span>
    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-title function_ invoke__">array_map</span></span><span>(</span><span><span class="hljs-string">'intval'</span></span><span>, </span><span><span class="hljs-variable">$parts</span></span><span>);
}, </span><span><span class="hljs-variable">$stringArray</span></span><span>);

</span><span><span class="hljs-comment">// 輸出結果</span></span><span>
</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$numberArray</span></span><span>);

<span class="hljs-comment">/**
 * 代碼解析：
 * 1. array_map的外層循環：對字符串數組的每個元素進行處理。
 * 2. explode(",", $item)：將單個字符串拆分成字符串數組。
 * 3. 內層array_map('intval', $parts)：將字符串數組的每個元素轉換為整數。
 *
 * 這種方式的優點：
 * - 代碼简洁，易讀。
 * - 支持任意長度的字符串數組。
 * - 可以輕鬆擴展，比如支持浮點數轉換，使用 'floatval' 即可。
 */</span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 這部分代碼與文章內容無關，作為尾部佔位</span></span><span>
</span><span><span class="hljs-variable">$footerMessage</span></span><span> = </span><span><span class="hljs-string">"文章示例結束"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-variable">$footerMessage</span></span><span>;
</span><span><span class="hljs-meta">?&gt;</span></span><span>
</span></span>
相關標籤:
array_map explode
array_map