php给一组指定关键词添加span标签的方法 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
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// 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
$value = /^((?:(?!\/\/).)*)\b . $value . \b/;
}
function addspan(&$value, $key, $color='blue') {
$value = $1 . $value . ;
}
function codewords($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;
}
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