~~~
/**
* 文章内链替换
* 替换规则:数组靠前的权重大
* @param string $content 文章内容
* @param array $links 内链词数组[$word=>$link],权重高的在前面,此参数不写为还原内链
* @return string 返回替换后的内容
*/
public static function innerLink($content, $links = array())
{
//还原内链
$content = preg_replace('/<a class=\"epwk_inner_link\"[^>]+>([^<]+)<\/a>/', '$1', $content);
//内链替换
if (is_array($links) && !empty($links)) {
//匿名函数,相同关键字仅替换一次
$func_replace_once = function ($search, $replace, $subject, &$isReplaced) {
$pos = strpos($subject, $search);
if ($pos === false) {
$isReplaced = false;
return $subject;
} else {
$isReplaced = true;
return substr_replace($subject, $replace, $pos, strlen($search));
}
};
//最终替换的数组
$finalReplace = array();
//已经替换过的链接数组
$exsist = array();
//非HTML匹配规则
$reg = '/(?:<[^>]*>)?([^<]*)(?:<[^>]*>)?/';
//正则匹配替换
$content = preg_replace_callback($reg, function ($matches) use ($links, &$exsist, $func_replace_once, &$finalReplace) {
if (trim($matches[1])) {
$tmp = $matches[1];
foreach ($links as $word => $link) {
if (!in_array($link, $exsist)) {
$isReplaced = false;
$replaceStr = '<a class="epwk_inner_link" href="' . $link . '" target="_blank">' . $word . '</a>';
$replaceStrMd5 = '[' . md5($replaceStr) . ']';
$tmp = $func_replace_once($word, $replaceStrMd5, $tmp, $isReplaced);
if ($isReplaced) {
$exsist[] = $link;
$finalReplace[$replaceStrMd5] = $replaceStr;
}
}
}
return str_replace($matches[1], $tmp, $matches[0]);
}
return $matches[0];
}, $content);
//进行最终的替换
if ($finalReplace) {
$keys = $vals = array();
foreach ($finalReplace as $k => $v) {
$keys[] = $k;
$vals[] = $v;
}
$content = str_replace($keys, $vals, $content);
}
}
return $content;
}
~~~
