之前版本对于换行处理有些问题,进行了一些改进
<?php
/**
* html 转 ubb 格式
*
* @param string $str
* @return string
*/
function ubb_encode($str) {
if (empty($str)) {
return $str;
}
$match_map = array(
'strong' => array('start' => '[b]', 'end' => '[/b]',),
'em' => array('start' => '[i]', 'end' => '[/i]',),
'text-align' => array('start' => '[align=%s]', 'end' => '[/align]',),
'font-size' => array(
'function' => 'px_to_em',
'start' => '[size=%s]', 'end' => '[/size]',
),
'background-color' => array(
'function' => 'rgb_to_hex',
'start' => '[backcolor=%s]', 'end' => '[/backcolor]',
),
'color' => array(
'function' => 'rgb_to_hex',
'start' => '[color=%s]', 'end' => '[/color]',
),
'text-decoration' => array(
'condition' => 'underline', 'style' => '',
'start' => '[u]', 'end' => '[/u]',
),
);
$tags_list = html_tags_grap($str); // 抓取HTML中的标签
if (empty($tags_list)) { // 没有抓取到标签
return $str;
}
$end_pop = array(); // 结束标签
$ubb_str = ''; // 转编码后的字符串
$is_p = 0; // 是否是p标签
foreach ($tags_list as $tag_info) {
$tag_name = $tag_info['name']; // 标签名
$contents = trim($tag_info['content']); // 内容
if ($tag_info['is_end'] == 1) { // 标签结束
$ubb_str .= array_pop($end_pop) . $contents;
if ($tag_name == 'p') {
$is_p = 0;
}
continue;
}
$style = $tag_info['style']; // 样式
// 标签处理
switch ($tag_name) {
case 'a' : // a 标签
$link = $tag_info['self'];
if (stripos($link, 'mailto') === FALSE) {
$ubb_str .= '[url=' . $link . ']' . $contents;
$end_pop[] = '[/url]';
continue;
}
// 处理 邮件地址
$ubb_str .= '[email=' . str_replace('mailto:', '', $link) . ']' . $contents;
$end_pop[] = '[/email]';
continue;
case 'br': // 换行
if ($is_p == 1) { // p标签内的br不换行
$ubb_str .= $contents;
} else {
$ubb_str .= PHP_EOL . $contents;
}
continue;
case 'strong' : // 粗体
case 'u' : // 下划线
case 'em' : // 斜体
case 'b' : // 粗体
case 'i' :
if (isset($match_map[$tag_name])) { // 是否是支持的样式
$match_tags = $match_map[$tag_name];
$ubb_str .= $match_tags['start'] . $contents;
$end_pop[] = $match_tags['end'];
} else {
$ubb_str .= '[' . $tag_name . ']' . $contents;
$end_pop[] = '[/' . $tag_name . ']';
}
continue;
case 'img':
$link = $tag_info['self'];
$ubb_str .= '[img]' . $link . '[/img]' . $contents;
continue;
case 'p' :
$ubb_str .= PHP_EOL;
$is_p = 1; // p标签
case 'div' :
case 'section':
case 'span' :
if (empty($style)) { // 空样式,不用处理样式
$ubb_str .= $contents;
continue;
}
$tag_name_end = '';
foreach ($style as $single_style) {
if (empty($single_style)) {
continue;
}
$style_name = $single_style['name']; // 样式名
if (!isset($match_map[$style_name])) { // 不支持处理的样式,则略过
continue;
}
$style_value = $single_style['value']; // 样式值
if (isset($match_map[$style_name]['condition'])) { // 样式支持的值
if ($match_map[$style_name]['condition'] != $style_value) {
continue;
}
}
if (isset($match_map[$style_name]['function'])) { // 需要特殊处理
$function = $match_map[$style_name]['function'];
if (!empty($function)) {
$style_value = call_user_func($function, $style_value);
}
}
if (isset($match_map[$style_name]['style'])) {
$style_value = $match_map[$style_name]['style'];
}
$ubb_str .= sprintf($match_map[$style_name]['start'], $style_value); // 样式开始标签
$tag_name_end = $match_map[$style_name]['end'] . $tag_name_end; // 结束标签
}
$ubb_str .= $contents;
$end_pop[] = $tag_name_end;
continue;
default : // 不支持的标签
$ubb_str .= $contents;
continue;
}
}
$filter_keymap = array(
'/&/i' => '&',
'/</i' => '<',
'/>/i' => '>',
'/ /i' => ' ',
'/ /' => ' ', // 空格
'/\<[^>]*?\>/i' => '',
'/\&#\d+;/' => '', // 特殊符号
);
return preg_replace(array_keys($filter_keymap), array_values($filter_keymap), $ubb_str);
}<?php
/**
* 获取 html 中的标签
*
* @param string $str
* @return array
*/
function html_tags_grap($str) {
preg_match_all('/(\<[\/]?([a-zA-Z]+)([^>]*)\>)([^\<]*)/', $str, $matchs);
if (!isset($matchs[1]) || empty($matchs[1])) {
return array();
}
$tag_list = array();
foreach ($matchs[1] as $key => $tag) {
$tag_name = strtolower($matchs[2][$key]); // 标签
$content = trim($matchs[4][$key]); // 内容
if (strpos($tag, '</') === 0) { // 结束标签
$tag_list[] = array(
'tag' => $tag,
'name' => $tag_name,
'content' => $content,
'is_end' => 1, // 1 结束
);
continue;
}
// 处理非结束标签
$style = trim($matchs[3][$key]); // 样式
if (empty($style)) { // 没有样式
$tag_list[] = array(
'tag' => $tag,
'name' => $tag_name,
'content' => $content,
'is_end' => 0, // 0 非结束
);
continue;
}
// 特殊处理
preg_match_all('/(style|href|src|align)=\"([^\"]+)\"/i', $style, $style_match);
if (!isset($style_match[1]) || empty($style_match[1])) { // 没有支持的内容
$tag_list[] = array(
'tag' => $tag,
'name' => $tag_name,
'content' => $content,
'is_end' => 0, // 0 非结束
);
continue;
}
$style_preg = array();
foreach ($style_match[1] as $sk => $sv) {
$style_preg[$sv] = $style_match[2][$sk];
}
$style_arr = array();
if (isset($style_preg['style'])) { // 有样式
$style_split = explode(';', $style_preg['style']); // 多样式分割
foreach ($style_split as $single_style) {
if (empty($single_style)) {
continue;
}
// 示例: text-decoration: underline
list($style_name, $style_value) = explode(':', $single_style); // 样式分割, key=>value
$style_name = trim($style_name); // 样式名
$style_arr[] = array(
'name' => $style_name,
'value' => trim($style_value),
);
}
}
$self = '';
if ($tag_name == 'img') { // 图片标签
$src = $style_preg['src'];
if (!filter_var($src, FILTER_VALIDATE_URL)) { // 非链接
if (strpos($src, '/') === false || strpos($src, ' ') !== false) { // 非相对路径
continue;
}
}
$self = $src;
} elseif ($tag_name == 'a') { // a标签
if (isset($style_preg['href'])) {
$self = $style_preg['href'];
}
}
$tag_list[] = array(
'tag' => $tag,
'name' => $tag_name,
'self' => $self,
'style' => $style_arr,
'content' => $content,
'is_end' => 0,
);
}
return $tag_list;
}<?php
/**
* RGB转 十六进制
*
* @param $rgb RGB颜色的字符串 如：rgb(255,255,255);
* @return string 十六进制颜色值 如：#FFFFFF
*/
function rgb_to_hex($rgb) {
$regexp = "/^rgb\(([0-9]{0,3})\,\s*([0-9]{0,3})\,\s*([0-9]{0,3})\)/";
$re = preg_match($regexp, $rgb, $match);
if ($re < 1) {
return '#FFFFFF';
}
$re = array_shift($match);
$hexColor = "#";
$hex = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
for ($i = 0; $i < 3; $i++) {
$r = null;
$c = $match[$i];
$hexAr = array();
while ($c > 16) {
$r = $c % 16;
$c = ($c / 16) >> 0;
array_push($hexAr, $hex[$r]);
}
array_push($hexAr, $hex[$c]);
$ret = array_reverse($hexAr);
$item = implode('', $ret);
$item = str_pad($item, 2, '0', STR_PAD_LEFT);
$hexColor .= $item;
}
return $hexColor;
}<?php
/**
* 字体 转换
*
* @param $px_size 字体px大小 如：24px;
* @return string em大小 如：1
*/
function px_to_em($px_size) {
$px_size = intval($px_size);
$size_keymap = array(
7 => 34,
6 => 24,
5 => 16,
4 => 14,
3 => 12,
2 => 10,
1 => 8,
);
$em = 4; // 默认是4
foreach ($size_keymap as $em => $px) {
if ($px_size > $px) {
break;
}
}
return $em;
}
