php给一组指定关键词添加span标签的方法

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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 < 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;

}