非常简单的 preg_replace 不起作用

Question

function emotify($text)
{
    $icons = array(
                ':)'    =>  '<img src="/images/emoticons/happy.png" alt="smile" class="icon_smile" />',
                ':-)'   =>  '<img src="/images/emoticons/happy.png" alt="smile" class="icon_smile" />',
                ':D'    =>  '<img src="/images/emoticons/grin.png" alt="smile" class="icon_laugh" />',
                ':d'    =>  '<img src="/images/emoticons/grin.png" alt="laugh" class="icon_laugh" />',
                ":'("    =>  '<img src="/images/emoticons/crying.png" alt="crying" class="icon_cry" />',
                ';('    =>  '<img src="/images/emoticons/crying.png" alt="crying" class="icon_cry" />',
                ':d'    =>  '<img src="/images/emoticons/grin.png" alt="laugh" class="icon_laugh" />',
                ';)'    =>  '<img src="/images/emoticons/wink.png" alt="wink" class="icon_wink" />',
                ':P'    =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
                ':-P'   =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
                ':-p'   =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
                ':p'    =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
                ':('    =>  '<img src="/images/emoticons/sad.png" alt="sad face" class="icon_sad" />',
                ':-('   =>  '<img src="/images/emoticons/sad.png" alt="sad face" class="icon_sad" />',
                ':o'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shock" />',
                ':O'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shock" />',
                ':0'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shack" />',
                ':|'    =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
                ':-|'   =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
                ':/'    =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
                ':-/'   =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />'
        );

     foreach($icons as $icon=>$image) {
      $icon = preg_quote($icon, '/');
$return = preg_replace("/$icon/i", $image, $text);
      }
    return $return;
}
$posted = emotify($posted);

这是我将表情符号转换为图像的代码。它只是返回
Warning: preg_replace(): Unknown modifier '/' on line 203

我该如何解决？ 编辑：这是我的所有代码，包括数组，这可能是我的代码无法正常工作的问题。我不确定，但没有一个答案有帮助，所以我认为这一定是问题所在。

Answer 1

通过 cmets 进一步确定了您正在做什么，这里是使用 DOM 解析器和一点聪明的答案：

$dom = new DOMDocument();
$dom->loadHTML($text);
$xpath = new DOMXPath($dom);
foreach($icons as $icon=>$image) {
  $textnodes = $xpath->query("//text()"); // get all text nodes
  foreach($textnodes as $node) {
    // the regex used here requires that there not be a non-space before it
    // in other words, it must be the first thing, or have a space before it
    while( preg_match("((?<!\S)".preg_quote($icon).")i",$node->nodeValue,$m,PREG_OFFSET_CAPTURE)) {
      $emote = $node->splitText($m[0][1]); // the offset is stored here
      $node = $emote->splitText(strlen($icon));
      // now replace the emote with the image:
      $img = $dom->createElement("img");
      $img->setAttribute("src",$image);
      // IMPORTANT: $image must be just the SRC, and NOT the entire HTML node
      $emote->parentNode->replaceChild($img,$emote);
    }
  }
}
// loadHTML puts the HTML into a document, we need to get it back out
$result = $dom->saveHTML($dom->getElementsByTagName('body')->item(0));
$result = substr($result,strlen("<body>"),-strlen("</body>"));

现在你可以使用$result，它应该有有效的HTML，包括转换后的表情。

Answer 2

$icon 的值中可能有一个斜线，所以你实际上是在调用

preg_replace( '/foo/bar/i', $image, $text )

这是一个错误。

Answer 3

preg_quote 不会转义斜杠，除非你告诉它这是你选择的分隔符。

话虽如此，使用 PREG 实在是太过分了。

请改用str_ireplace。

Answer 4

preg_quote 实际上有 2 个参数。第二个可选参数可以是在preg functions 中使用的regex delimiter。

按照说明书：

delimiter

If the optional delimiter is specified, it will also be escaped. This is useful for escaping the delimiter that is required by the PCRE functions. The / is the most commonly used delimiter.

像这样使用你的代码：

$icon = preg_quote($icon, '/');
$return = preg_replace("/$icon/i", $image, $text);

更新：问题是您没有在 foreach 循环开始之前初始化 $return 变量，并且总是尝试替换原始 $text 变量本身。

让你的 foreach 循环像这样：

$return = $text;
foreach($icons as $icon=>$image) {
       $icon = preg_quote($icon, '/');
       $return = preg_replace("/$icon/i", $image, $return);
}

Answer 5

你可以这样做：

function emotify($text)
{
    $icons = array(
        ':)'    =>  '<img src="/images/emoticons/happy.png" alt="smile" class="icon_smile" />',
        ':-)'   =>  '<img src="/images/emoticons/happy.png" alt="smile" class="icon_smile" />',
        ':D'    =>  '<img src="/images/emoticons/grin.png" alt="smile" class="icon_laugh" />',
        ':d'    =>  '<img src="/images/emoticons/grin.png" alt="laugh" class="icon_laugh" />',
        ':\'('  =>  '<img src="/images/emoticons/crying.png" alt="crying" class="icon_cry" />',
        ';('    =>  '<img src="/images/emoticons/crying.png" alt="crying" class="icon_cry" />',
        ';)'    =>  '<img src="/images/emoticons/wink.png" alt="wink" class="icon_wink" />',
        ':P'    =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
        ':-P'   =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
        ':-p'   =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
        ':p'    =>  '<img src="/images/emoticons/tounge.png" alt="tounge" class="icon_tounge" />',
        ':('    =>  '<img src="/images/emoticons/sad.png" alt="sad face" class="icon_sad" />',
        ':-('   =>  '<img src="/images/emoticons/sad.png" alt="sad face" class="icon_sad" />',
        ':o'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shock" />',
        ':O'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shock" />',
        ':0'    =>  '<img src="/images/emoticons/shocked.png" alt="shock" class="icon_shack" />',
        ':|'    =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
        ':-|'   =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
        ':/'    =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />',
        ':-/'   =>  '<img src="/images/emoticons/straight.png" alt="straight face" class="icon_straight" />'
        );
    return str_replace(array_keys($icons), array_values($icons), $text);
}

请注意，在这种情况下，最好定义两个数组。

注意：这种搜索/替换不能区分大小写:D :d
一个笑的表情是重复的。