如何結合mb_encode_numericentity 和正則表達式來處理特定的字符或文本？

gitbox 2025-09-11

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 一些無關前置代碼</span></span><span>
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    </span><span><span class="hljs-keyword">return</span></span><span> </span><span><span class="hljs-string">"這只是前置代碼，與文章內容無關"</span></span><span>;
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</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h1>如何結合 mb_encode_numericentity 和正則表達式來處理特定的字符或文本？</h1>"</span></span><span>;

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>在處理多字節字符（如中文、日文、韓文等）時，PHP 提供了 <code>mb_encode_numericentity

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其中：

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\$str：要轉換的字符串

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\$convmap：轉換映射數組，格式為[start, end, offset, mask]

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\$encoding：字符編碼，默認'UTF-8'

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例如，我們想將所有中文字符轉換為HTML 實體：

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\$convmap = [0x4e00, 0x9fff, 0, 0xFFFF];
\$str = &#39;測試中文&#39;;
\$encoded = mb_encode_numericentity(\$str, \$convmap, &#39;UTF-8&#39;);
echo \$encoded; // 測試中文

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2. 正則表達式匹配特定字符

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通過正則表達式，我們可以篩選出我們關心的文本。例如，只匹配中文字符：

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\$str = &#39;Hello 測試World 中文&#39;;
preg_match_all(&#39;/[\x{4e00}-\x{9fff}]+/u&#39;, \$str, \$matches);
print_r(\$matches[0]); // Array ( [0] => 測試[1] => 中文)

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3. 結合mb_encode_numericentity 和正則表達式

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如果我們只想對匹配到的中文字符進行數字實體轉換：

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\$convmap = [0x4e00, 0x9fff, 0, 0xFFFF];
\$str = &#39;Hello 測試World 中文&#39;;

// 使用正則匹配preg_match_all(&#39;/[\x{4e00}-\x{9fff}]+/u&#39;, \$str, \$matches);

// 遍歷匹配結果並替換為實體foreach (\$matches[0] as \$match) {
    \$encoded = mb_encode_numericentity(\$match, \$convmap, &#39;UTF-8&#39;);
    \$str = str_replace(\$match, \$encoded, \$str);
}

echo \$str; // Hello 測試World 中文

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