我目前正在制作自制的标题系统。因此,我尝试在文本中使用#_1#
- #_4#
进行编号,然后应在标题中进行转换。因此,您可以在数字和第二个#
之间编写标题文本。例如:
#_1Testheadline#
#_2second headline under the first one#
#_2another headline under the first one#
#_1second headline (not under the first one)#
会变成
1. Testheadline
1.1 second headline under the first one
1.2 another headline under the first one
2. second headline (not under the first one)
希望你理解我的意思。
所以第一个例子(其中包含#_1#
)是用WYSIWYG-Editor编写的,所以这是普通的html代码,然后存储在数据库的变量中。
我现在想要的是当我从数据库中获取此变量时,我想用真实标题(查看)替换所有伪标题,因此第一个示例将成为第二个。
因此,我需要找到#_1
的所有出现,替换为<h1>
,继续#
并将其替换为</h1>
。同样适用于第二,第三和第四层&#34;层&#34;标题如果我能够做到这一点,我仍然无法完成,因为现在,标题需要他们的数字,因此我可以简单地使用4个计数器:
var firstlayercount = 0,
secondlayercount = 0;
var thirdlayercount = 0,
fourthlayercount = 0;
并根据找到的标题增加并将它们设置为0,所以实际上这应该是更容易的部分。但更难的问题是,如何找到字符串中的#_1
,替换它然后转到#
并替换它?这样做几次?
答案 0 :(得分:2)
使用preg_replace_callback函数
$str = '#_1Testheadline#
#_2second headline under the first one
#_2another headline under the first one
#_1second headline (not under the first one)';
// Current level
$level = 0;
echo preg_replace_callback('/#?\s*#_(\d)+/',
function($x) use (&$level) {
// Close previous tag if it is
$out = ($level ? "</h{$level}>\n" : '');
// Save current level and open tag
$level = $x[1];
return $out . "<h{$level}>";
},
// Don't forget to close the last tag
$str) . "<h{$level}>";
结果
<h1>Testheadline#</h1>
<h2>second headline under the first one</h2>
<h2>another headline under the first one</h2>
<h1>second headline (not under the first one)<h1>
更新1
您可以使用相同的方法构建有序列表
$level = 0;
echo preg_replace_callback('/#?\s*#_(\d)+/',
function($x) use (&$level) {
if($x[1] > $level) $out = "\n<ol>\n";
else if ($x[1] < $level) $out = "</li>\n</ol>\n";
else $out = "</li>\n";
$level = $x[1];
return $out . "<li>";
},
$str) . "</li>\n</ol>\n";
结果
<ol>
<li>Testheadline#
<ol>
<li>second headline under the first one</li>
<li>another headline under the first one</li>
</ol>
<li>second headline (not under the first one)</li>
</ol>
更新2
按css划分样式列表
<STYLE>
ol {
list-style: none;
counter-reset: li;
}
li:before {
counter-increment: li;
content: counters(li,".") ". ";
}
</STYLE>
<ol>
<li>Testheadline#
<ol>
<li>second headline under the first one</li>
<li>another headline under the first one</li>
</ol>
<li>second headline (not under the first one)</li>
</ol>
更新3
通过php进行编号
$cnts = [ 0 ];
echo preg_replace_callback('/#?\s*#_(\d)+/',
function($x) use (&$cnts) {
$level = $x[1]-1;
if($level < count($cnts)-1) $cnts = array_slice($cnts, 0, $level+1);
if (! isset($cnts[$level])) $cnts[$level] = 1;
else $cnts[$level]++;
$temp = array_slice($cnts, 0, $level+1);
return "\n" . implode('.', $temp) . ". ";
},
$str) ;
结果
1. Testheadline
1.1. second headline under the first one
1.2. another headline under the first one
2. second headline (not under the first one)