使用你给我的示例代码，这是我能做的最好的，那里有太多的图像，你需要一个天才来找出你的要求所需的逻辑，但试试它可能不会太远了。为此，您需要 php 5.5。
需要注意的几点：
1. 它将段落标识为包裹在 p 元素中，而不是可视段落。
2. 如果 p 元素存在于其他元素中，它也会将它们识别为段落。第一个广告就是一个例子。避免在块引用、列表等中使用 p，这不是必需的，而是使用 spans、div 来代替文本。
3. 我在 __construct 中注释了调用函数的行，取消注释以插入第二张图像。这实际上效果很好，但是您的内容有很多 p 元素，句子分成多个 p，这不太可能成为实际内容的一个因素。
4. 搜索para 1 + para 2中的图片并删除它们。
$content = apply_filters('the_content', get_the_content() );
class adinsert {
var $content;
var $paragraphs;
var $ad_pos1=2;
var $ad_pos2;
var $ad_pos3;
var $ad= '<h1>ad position here</h1>';
public function __construct($content) {
if(!$content)
return $content;
$this->set_content($content);
$this->paragrapherize(2);
$this->paragraph_numbers();
$this->get_first_pos();
$this->paragrapherize();
$this->paragraph_numbers();
$this->find_images();
$this->find_ad_pos();
$this->insert_ads();
}
public function echo_content(){
echo $this->content;
}
private function insert_ads() {
if($this->ad_pos2 && $this->ad_pos2 != 'end'):
$posb= $this->ad_pos2;
$this->content=substr_replace($this->content,$this->ad,$posb ,0);
else:
$this->content.= $this->ad;
endif;
//comment the below line to remove last image insertion
$this->content.= $this->ad;
}
private function get_first_pos() {
$i=0;
foreach($this->paragraphs as $key=>$data):
if($i==0):
$length= $data['end']-$data['start'];
$string= substr($this->content, $data['start'],$length);
$newkey= $key+1;
$lengthb= $this->paragraphs[$newkey]['end']-$this->paragraphs[$newkey]['start'];
$stringb= substr($this->content, $this->paragraphs[$newkey]['start'],$lengthb);
$wcount= count(explode(' ', $string));
if( preg_match('/(<img[^>]+>)/i', $string, $image) ):
$newstring=preg_replace('/(<img[^>]+>)/i', '', $string);
if($wcount>10):
$newstring.=$this->ad;
$this->ad_pos1=1;
$this->content=str_replace($string,$newstring,$this->content);
endif;
else:
if($wcount>10) :
$newstring=$string.$this->ad;
echo $newstring;
$this->ad_pos1=1;
//$this->content=str_replace($string,$newstring,$this->content);
$this->content= preg_replace('~'.$string.'~', $newstring, $this->content, 1);
endif;
endif;
if( preg_match('/(<img[^>]+>)/i', $stringb, $imageb) ):
$newstringb=preg_replace('/(<img[^>]+>)/i', '', $stringb);
if($wcount<10) :
$newstringb.=$this->ad;
$this->ad_pos1=2;
$this->content=str_replace($stringb,$newstringb,$this->content);
endif;
else:
if($wcount<10) :
$newstring=$stringb.$this->ad;
$this->ad_pos1=2;
$this->content=str_replace($stringb,$newstringb,$this->content);
endif;
endif;
else:
break;
endif;
$i++;
endforeach;
}
private function find_ad_pos() {
$remainder_images= $this->paragraph_count;
if($remainder_images < $this->ad_pos1 + 3):
$this->ad_pos2='end';
else:
foreach($this->paragraphs as $key=>$data):
$p[]=$key;
endforeach;
unset($p[0]);
unset($p[1]);
$startpos= $this->ad_pos1 + 2;
$possible_ad_positions= $remainder_images - $startpos;
//figure out half way
if($remainder_images < 3): //use end pos
$pos1= $startpos;
$pos1=$this->getclosestkey($pos1, $p);
else: // dont use end pos
$pos1= ($remainder_images/2)-1;
$pos1= $this->getclosestkey($pos1, $p);
endif;
$this->ad_pos2= $this->paragraphs[$pos1]['end'];
endif;
}
private function getclosestkey($key, $keys) {
$close= 0;
foreach($keys as $item): //4>4
if($close == null || $key - $close > $item - $key ) :
$close = $item;
endif;
endforeach;
return $close;
}
private function find_images() {
foreach($this->paragraphs as $item=>$key):
$length= $key['end']-$key['start'];
$string= substr($this->content, $key['start'],$length);
if(strpos($string,'src')!==false && $item !=0 && $item !=1):
//unset the number, find start in paragraphs array + 1 after
unset($this->paragraphs[$item]);
$nextitem= $item+1;
$previtem= $item-1;
unset($this->paragraphs[$nextitem]);
unset($this->paragraphs[$previtem]);
endif;
endforeach;
}
private function paragraph_numbers() {
$i=1;
foreach($this->paragraphs as $item):
$i++;
endforeach;
$this->paragraph_count=$i;
}
private function paragrapherize($limit=0) {
$current_pos=0;
$i=0;
while( strpos($this->content, '<p', $current_pos) !== false ):
if($limit && $i==$limit)
break;
if($i==105) {
break;
}
if($i!=0) {
$current_pos++;
}
$paragraph[$i]['start']=strpos($this->content, '<p', $current_pos);//1
//looking for the next time a /p follows a /p so is less than the next position of p
$nextp= strpos($this->content, '<p', $paragraph[$i]['start']+1); //14 failing on next???
$nextendp= strpos($this->content, '</p>', $current_pos);//22
if($nextp>$nextendp)://NO
$paragraph[$i]['end']=$nextendp;
if( ($nextendp - $paragraph[$i]['start']) < 80 ):
unset($paragraph[$i]);
endif;
$current_pos= $nextendp;
$i++;
else:
$startipos = $nextendp;
$b=0;
do {
if($b==100){
break;
}
$nextp= strpos($this->content, '<p', $startipos); //230
$nextendp= strpos($this->content, '</p>', $startipos+1);//224
if($nextp>$nextendp) {
$paragraph[$i]['end']=$nextendp;
$current_pos= $nextendp;
$i++;
} else {
$startipos = $nextendp+1;
}
$b++;
} while ($nextp < $nextendp );
endif;
endwhile;
$this->paragraphs= $paragraph;
}
public function set_content($content) {
$this->content= $content;
}
}
$newcontent= new adinsert($content);
然后你想输出你的内容
<?php echo $newcontent->echo_content(); ?>