如何在 PHP 中有效转换智能引号：综合指南

在 PHP 中转换智能引号：综合指南

在 PHP 中，处理智能引号可能是一项复杂的任务。以下改进的函数可确保将所有类型的智能引号全面转换为常规引号：

<code class="php">function convert_smart_quotes($string)
{
    $unicode_map = array(
        "\xC2\xAB"     => "'", // U+00AB left-pointing double angle quotation mark
        "\xC2\xBB"     => "'", // U+00BB right-pointing double angle quotation mark
        "\xE2\x80\x98" => "'", // U+2018 left single quotation mark
        "\xE2\x80\x99" => "'", // U+2019 right single quotation mark
        "\xE2\x80\x9A" => "'", // U+201A single low-9 quotation mark
        "\xE2\x80\x9B" => "'", // U+201B single high-reversed-9 quotation mark
        "\xE2\x80\x9C" => '"', // U+201C left double quotation mark
        "\xE2\x80\x9D" => '"', // U+201D right double quotation mark
        "\xE2\x80\x9E" => '"', // U+201E double low-9 quotation mark
        "\xE2\x80\x9F" => '"', // U+201F double high-reversed-9 quotation mark
        "\xE2\x80\xB9" => "'", // U+2039 single left-pointing angle quotation mark
        "\xE2\x80\xBA" => "'", // U+203A single right-pointing angle quotation mark

        // Windows codepage 1252
        "\xC2\x82" => "'", // U+0082⇒U+201A single low-9 quotation mark
        "\xC2\x84" => '"', // U+0084⇒U+201E double low-9 quotation mark
        "\xC2\x8B" => "'", // U+008B⇒U+2039 single left-pointing angle quotation mark
        "\xC2\x91" => "'", // U+0091⇒U+2018 left single quotation mark
        "\xC2\x92" => "'", // U+0092⇒U+2019 right single quotation mark
        "\xC2\x93" => '"', // U+0093⇒U+201C left double quotation mark
        "\xC2\x94" => '"', // U+0094⇒U+201D right double quotation mark
        "\xC2\x9B" => "'" // U+009B⇒U+203A single right-pointing angle quotation mark
    );

    // Map special HTML entities
    $html_entities = array(
        "&amp;#8216;" => "'", // left single quotation mark
        "&amp;#8217;" => "'", // right single quotation mark
        "&amp;#8220;" => '"', // left double quotation mark
        "&amp;#8221;" => '"' // right double quotation mark
    );

    // Map Windows CP1252 entities
    $windows_cp1252 = array(
        "&amp;lsquo;" => "'", // left single quotation mark
        "&amp;rsquo;" => "'", // right single quotation mark
        "&amp;ldquo;" => '"', // left double quotation mark
        "&amp;rdquo;" => '"', // right double quotation mark
        "&amp;mdash;" => ' - ', // em dash
        "&amp;ndash;" => '- ' // en dash
    );

    // Unicode first
    $string = str_replace(
        array_keys  ($unicode_map),
        array_values($unicode_map),
        html_entity_decode($string, ENT_QUOTES, "UTF-8")
    );

    // Windows CP1252 next
    $string = str_replace(
        array_keys  ($windows_cp1252),
        array_values($windows_cp1252),
        $string
    );

    // Finally, HTML entities
    $string = str_replace(
        array_keys  ($html_entities),
        array_values($html_entities),
        $string
    );

    return $string;
}</code>

此函数处理智能引号的所有 Unicode 标准、Windows 代码页 1252 和 HTML 实体。它确保所有类型的智能报价都能准确转换为常规报价，为PHP中的报价转换提供全面的解决方案。

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