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HomeBackend DevelopmentPHP Tutorialphp笔记之:文章中图片处理的使用_PHP

array_diff($arr1,$arr2)
php数组函数之一,用来计算数组的差集.
正则匹配html图片标签
用sinaeditor添加的图片删除操作
用法之一,今天晚上在用新浪编辑器发表文章的过程中.
使用到了此函数

问题描述:

文章中有图片若干.在增加文章的过程中自动上传到网站的图片目录中
在修改文章的过程中如果对图片进行相关的删除操作.那么虽然在代码中(已经存入数据库);
已经删除了数据的标签.类似于php笔记之:文章中图片处理的使用_PHP这样的标签.但是图片的文件依旧存在于
网站上.这时候需要一定的处理

处理办法:

首先:从数据库中得到原始的文章内容
从里面得到图片的文件名
用到了正则

方法如下
复制代码 代码如下:
public function getimgsinarticle($content)
 {
  $temp = array();
  $imgs = array();
  preg_match_all('/http[^\d]*[\d]+[\.](jpg|gif|png)/',$content,$temp);
  $temp = $temp[0];
  if(!empty($temp[0]))
  {
   for($i=0;$i   {
    $imgs[$i] = pathinfo($temp[$i]);
    $imgs[$i] = $imgs[$i]['basename'];
   }
   return $imgs;
  }
  else
  {
   return false;
  }
 }

对正则进行下解释,先匹配http四个字母然后匹配非数字的字符若干个.匹配数字字符至
少一个,匹配点(.)一个,匹配以jpg或gif或png结尾从$congtent中查找.结果存入$temp中.
将数据库中的原始数据中的图片保存在数组中.命名为$oldimgs
这个地方我觉得应该改进下,存入后打印出来是二维数组.用起来有点费事
注:我的图片名称是类似于这个样子命名的:"201111291322589013.jpg"

第二步:
从用户提交过来的内容中找到所有的图片方法如上.得到数组二命名为$newimgs
对arr1和arr2求差集方法如下
--也就是说如果原始数据中的图片不存在于用户新提交的内容中.那么将删除这个图片.
复制代码 代码如下:
$oldimgs = $this->getimgsinarticle($oldarticledata['article_content']);
   $newimgs = $this->getimgsinarticle($data['articlecontent']);
   //print_r($newimgs);
   $newimgs = empty($newimgs)?array():$newimgs;
   if($oldimgs!=false)
   {
    $diff = array_diff($oldimgs,$newimgs);
    $diff = array_values($diff);
    if(!empty($diff))
    {
     for($i=0;$i     {
      $this->delimg($diff[$i],ARTICLE_IMG_DIR);
     }
    }
   }

删除图片的方法如下 很简单.
复制代码 代码如下:
 public function delimg($imgname,$dir)
 {
  @unlink($dir.'/'.$imgname);
  return true;
 }

这样我的目的就达到了.当用户编辑了带有图片的文章.如果删除了图片.那么相应的图片也会从网站上删除
得到文章中的图片名称的方法还可以应用到删除文章的过程中.

在删除图片的方法中的$dir可以用realpath(__FILE__)加上各种"./""../"去给出图片目录相对于网站的目录
对于得到html中的路径这里的正则写的不是很好.有待研究.最近发现一本正则的书.很不错
精通正则表达式第三版  Jeffrey E.F. Friedl著 ,余晟(cheng)译

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