php给一组指定关键词添加span标签的方法

本文实例讲述了php给一组指定关键词添加span标签的方法。分享给大家供大家参考。具体如下：

这里是php给一组指定的关键词添加span标签，高亮突出显示关键词

    // Example use: $spanned = codeWords($string_containing_keywords);
    // My site: andrew.dx.am
    // Using colour==blue, but different arrays of words and different 
    // colours can be added.
    function onlyWholeWords(&$value, $key) {
    // Ignores words after // comment delimiters.
    //$value = "/\b(" . $value . ")\b/";  // doesn't handle comments
    //$value = "/^(?:(?!\/\/).)*\K\b(" . $value . ")\b/"; 
    // \K lookbehind alternative is not supported in PHP < 5.2.4, so use:
      $value = "/^((?:(?!\/\/).)*)\b" . $value . "\b/";
    }
    function addSpan(&$value, $key, $color='blue') {
      $value = "$1<span style='color:$color'>" . $value . "</span>";
    }
    function codeWords($code) {
      $keywords = array('as', 'break', 'case', 'class',
      'continue', 'default', 'do', 'elif', 'else',
      'elseif', 'for', 'foreach', 'function', 'if', 
      'new', 'null', 'return', 'self', 'switch',
      'this', 'to', 'typeof', 'until',
      'var', 'void', 'while', 'with');
      $keywords2 = $keywords;
      array_walk($keywords, 'onlyWholeWords');
      array_walk($keywords2, 'addSpan', 'blue');
      $code = preg_replace($keywords, $keywords2, $code);
      return $code;
    }

希望本文所述对大家的php程序设计有所帮助。