wordpress纯代码不用插件实现首页摘要自动截取样式

带图片输出

<?php 
if(preg_match('/<!--more-->/',$this->content)||mb_strlen($this->content, 'utf-8') < 270)
{
$this->content('阅读全文...');
}
else
{ 
$c=mb_substr($this->content, 0, 270, 'utf-8');
echo $c.'...';
echo '</br><p class="more"><a href="',$this->permalink(),'" title="',$this->title(),'">阅读全文...</a></p>';
}
?>

不带图片输出：

<?php 
if(preg_match('/<!--more-->/',$this->content)||mb_strlen($this->content, 'utf-8') < 270)
{
$this->content('阅读全文...');
}
else
{ 
$c=mb_substr($this->content, 0, 270, 'utf-8');
$c=preg_replace("/<[img|IMG].*?src=[\'\"](.*?(?:[\.gif|\.jpg|\.jpeg|\.png|\.tiff|\.bmp]))[\'|\"].*?[\/]?>/","",$c);
echo $c.'...';
echo '</br><p class="more"><a href="',$this->permalink(),'" title="',$this->title(),'">阅读全文...</a></p>';
}
?>

截取代码部分输出：

<?php 
if(preg_match('/<!--more-->/',$this->content)||mb_strlen($this->content, 'utf-8') < 270)
{
$this->content('阅读全文...');
}
else
{ 
$c=mb_substr($this->content, 0, 270, 'utf-8');
$c=preg_replace("/<[img|IMG].*?src=[\'\"](.*?(?:[\.gif|\.jpg|\.jpeg|\.png|\.tiff|\.bmp]))[\'|\"].*?[\/]?>/","",$c);
if(preg_match('/<pre>/',$c))
{
echo $c,'</code></pre>','...';;
}
else
{
echo $c.'...';
}
echo '</br><p class="more"><a href="',$this->permalink(),'" title="',$this->title(),'">阅读全文...</a></p>';
}
?>

来源：https://www.cnblogs.com/feichui/p/12656469.html