Question

我正在编写像Facebook一样的刮刀来获取给定网址的信息。我只是完成基本功能的一步。到目前为止的问题是删除无用的图像。例如，当我运行一些随机网址时，我会得到所有这些图片：

Scraper Object
(
    [url] => http://buzz.money.cnn.com/2012/07/23/spain-italy-short-selling/?iid=HP_Highlight
    [title] => Spain and Italy ban short selling  - The Buzz  - Investment and Stock Market News
    [description] => The Euronext 100 stock index falls sharply on renewed concerns about Spain.    Securities regulators in Spain and Italy both instituted short-selling bans Monday as financial markets tumbled.    The move is designed to limit the downward pressure
    [imageUrls] => Array
        (
            [0] => http://cnnmoneybuzzblog.files.wordpress.com/2012/07/chart_ws_index_euronext100_201272310932-09.png
            [1] => http://i.cdn.turner.com/money/.e1m/img/5.0/data/feargreed/scale.316x95.png
            [2] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/ben_rooney_130.jpg
            [3] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/catherine_tymkiw.02.jpg
            [4] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/paul_lamonica.02.jpg
            [5] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/hibah_yousuf.02.jpg
            [6] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/maureen_farrell.02.jpg
            [7] => http://i2.cdn.turner.com/money/.element/img/5.0/sections/contributors/ben_rooney.02.jpg
            [8] => http://i.cdn.turner.com/money/.element/img/4.0/services/button_login.gif
            [9] => http://www.bizographics.com/collect/?fmt=gif&pid=311
            [10] => http://pixel.quantserve.com/pixel/p-5dyPa639IrgIw.gif
            [11] => http://i.cdn.turner.com/money/.element/img/1.0/misc/1.gif
            [12] => http://buzz.money.cnn.com/2012/07/23/spain-italy-short-selling/?iid=HP_Highlight//pixel.quantserve.com/pixel/p-18-mFEk4J448M.gif?labels=%2Clanguage.en%2Ctype.wpcom%2Cposttag.bonds%2Cposttag.dow%2Cposttag.ibex%2Cposttag.italy%2Cposttag.lehman%2Cposttag.milan%2Cposttag.nasdaq%2Cposttag.sp-500%2Cposttag.short-selling%2Cposttag.spain%2Cposttag.stock%2Cposttag.yields%2Cvip.cnnmoneybuzzblog
            [13] => http://stats.wordpress.com/b.gif?v=noscript
        )

)

我只需要找到一种方法来删除以.gif或.png结尾的所有图像，然后让.jpg放在数组中，这样用户就可以看一下并为文章选择合适的图像。

我已经尝试了一些数组函数，但我认为这需要一些正则表达式的魔法才能在几乎任何给定的URL中工作。

P.S。我可以使用$info->url，$info->description等来访问所有数组数据。只需要过滤该数组就可以了。

Answer 1

不使用正则表达式：

foreach ($objects_array as $obj){
  foreach($obj->imageUrls as $key => $img){
    if(substr($img, -4) === '.gif' || substr($img, -4) === '.png'){
      unset($key);
    }
  }
}

并使用正则表达式：

$pt = '/gif$|png$/';
foreach ($objects_array as $obj){
  foreach($obj->imageUrls as $key => $img){
    $res = preg_match($pt, $img);
    if($res){
      unset($key);
    }
  }
}

Answer 2

尝试array_filter：

http://php.net/manual/en/function.array-filter.php

回调函数应该是一个非常基本的函数，如果正则表达式匹配.png或.gif，则返回false。

Answer 3

您可以在构建数组后进行过滤：

function only_jpgs($url){
    return substr($url, -4) == '.jpg' ? $url : false;
}

$info->imageUrls = array_filter($info->imageUrls, "only_jpgs");

但您可能应该在构建阵列之前过滤掉图像。

如何从数组中删除某些条目（使用正则表达式）？

3 个答案: