如何結合mb_ereg和mb_split函數實現多字節字符串的高效分割？實戰指南

gitbox 2025-08-27

3. 使用mb_split實現分割

<span><span><span class="hljs-title function_ invoke__">mb_internal_encoding</span></span><span>(</span><span><span class="hljs-string">"UTF-8"</span></span><span>); </span><span><span class="hljs-comment">// 設置內部字符編碼</span></span><span>

</span><span><span class="hljs-variable">$pattern</span></span><span> = </span><span><span class="hljs-string">"[,，]+"</span></span><span>;  </span><span><span class="hljs-comment">// 匹配英文逗號和中文逗號，一個或多個連續</span></span><span>
</span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">mb_split</span></span><span>(</span><span><span class="hljs-variable">$pattern</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>);

</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$result</span></span><span>);
</span></span>

輸出結果：

 <span><span>Array
(
    [</span><span><span class="hljs-meta">0</span></span><span>] =&gt; 蘋果
    [</span><span><span class="hljs-meta">1</span></span><span>] =&gt; 香蕉
    [</span><span><span class="hljs-meta">2</span></span><span>] =&gt; 橘子
    [</span><span><span class="hljs-meta">3</span></span><span>] =&gt; 葡萄
    [</span><span><span class="hljs-meta">4</span></span><span>] =&gt; 西瓜
)
</span></span>

mb_split自動識別了中文逗號，正確地完成了字符串的分割。

4. 結合mb_ereg進行預匹配

在某些複雜場景中，我們希望先判斷字符串中是否存在某種模式，再進行分割。這時可以用mb_ereg ：

 <span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">mb_ereg</span></span><span>(</span><span><span class="hljs-string">"[,，]"</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>)) {
    </span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">mb_split</span></span><span>(</span><span><span class="hljs-string">"[,，]+"</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>);
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-variable">$result</span></span><span> = [</span><span><span class="hljs-variable">$text</span></span><span>]; </span><span><span class="hljs-comment">// 無需分割</span></span><span>
}
</span></span>

這樣做可以避免不必要的分割操作，提高效率。

5. 注意事項

字符編碼統一：通過mb_internal_encoding("UTF-8")確保函數統一使用UTF-8編碼，避免亂碼。
正則模式書寫： mbstring的正則表達式語法略有不同，注意方括號、轉義字符的正確使用。
性能考慮：對大文本進行多次正則匹配時，結合mb_ereg判斷再分割能提升效率。

6. 總結

通過合理結合mb_ereg和mb_split ，我們可以：

準確處理多字節編碼的字符串分割
靈活支持多種分隔符
在預匹配條件下優化性能

掌握這些技巧，能讓你在處理多語言文本時游刃有餘，避免常見的亂碼和分割錯誤問題。

示例完整代碼：

 <span><span><span class="hljs-title function_ invoke__">mb_internal_encoding</span></span><span>(</span><span><span class="hljs-string">"UTF-8"</span></span><span>);

</span><span><span class="hljs-variable">$text</span></span><span> = </span><span><span class="hljs-string">"蘋果,香蕉，橘子,葡萄，西瓜"</span></span><span>;

</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">mb_ereg</span></span><span>(</span><span><span class="hljs-string">"[,，]"</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>)) {
    </span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">mb_split</span></span><span>(</span><span><span class="hljs-string">"[,，]+"</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>);
} </span><span><span class="hljs-keyword">else</span></span><span> {
    </span><span><span class="hljs-variable">$result</span></span><span> = [</span><span><span class="hljs-variable">$text</span></span><span>];
}

</span><span><span class="hljs-title function_ invoke__">print_r</span></span><span>(</span><span><span class="hljs-variable">$result</span></span><span>);
</span></span>

運行後即可得到正確的分割結果。