我正在尝试使用Bing Search API来允许用户将bing图像与网站上的帖子联系起来,一旦他们从那里选择图像搜索就将其保存到服务器中以供使用..但有时使用Bing搜索结果’ MediaUrl’返回的不是nessecarily图像.

示例1)搜索关键字Nascar
返回两个图像：
1)www.betbigdc.com/wp-content/uploads/2010/02/nascar1.jpg< - 实际上是图像,我可以使用,工作在< img src =''>.
2)http://images4.fanpop.com/image/photos/23900000/NASCAR-nascar-23962589-425-425.jpg ..该网址实际载入www.fanpop.com/clubs/nascar/images/23962589/title/nascar-photo?ir=true ..

示例2)搜索关键字Jason Aldean
返回两个图像：
1)www.greenobles.com/data_images/jason-aldean/jason-aldean-01.jpg< - 在< img src =''>中工作的实际图像网址.
2)实际加载网页的http://www.cmtradiolive.com/wp-content/uploads/2009/10/jason-aldean.jpg搞笑网址.

<?PHP
// Search Bing Api 
$articles = sitesearch('Jason Aldean',$_SERVER['HTTP_HOST'],$accountKey,4);
$i        = 0;
// Process Results starting with reszing image within aspect ration to display to user
foreach ($articles['d']['results'] as $article) {
    $i++;

    $dimensions    = array(
        $article['Width'],$article['Height']
    );
    $dimensionsNew = array(
        125,125
    );

    // What scale do we need to go to
    $scalerequired = min($dimensionsNew[0] / $dimensions[0],$dimensionsNew[1] / $dimensions[1]);

    if ($scalerequired < 1) {
        $twidth  = $dimensions[0] * $scalerequired;
        $theight = $dimensions[1] * $scalerequired;

        // Resize to $finalDimensions

    } else {
        $twidth  = $article['Width'];
        $theight = $article['Height'];
    }
    // Display images resized within ration to =< 125PX
    echo "<img alt='bimage' width='$twidth' height='$theight' src='" . $article['MediaUrl'] . "' style='magin:     10px !important; 
       border: thin solid #666666;' />&nbsp;&nbsp;";

}
?>

有没有办法验证给定的网址是或不是直接图片网址？！

/**
 *
 * @return boolean Whether image is "pure"
 */
function is_image_url($url,array $extensions){

    $response = get_headers($url,1);

    foreach($response as $key => $value){

         foreach($extension as $ext){

              if (stripos($value,$ext) !== FALSE){
                  return TRUE;
              }
         }
   }

   return FALSE;
}

//Usage:

$extensions = array('jpg','gif','bmp');

if ( is_image_url('http://exampe.com/image.jpg',$extensions) === TRUE ){
   // It is. Do some stuff here
}