Reasons why dynamic thumbnails are not displayed in ie6_PHP tutorial

When I upload and generate a thumbnail, the link displayed in the thumbnail is as follows;

Copy code The code is as follows:

< img src ="/index.php?action=sys_upload_showThumb&id=bdc3955470adfb5637a0d1f517eb3d35" />

As a result, the thumbnail is not displayed under ie6; it was later traced back to the following piece of code:

Copy code The code is as follows:

header("Content-type: image/jpeg");
header("Content-Length: ". strlen($_SESSION["fileInfo"][$image_id]));
echo $_SESSION["fileInfo"][$image_id];
unset($_SESSION['fileInfo'][$image_id]); //
exit(0);

So I wondered if it was unset before it was displayed? So the deletion was successful. Later it was changed to the following code:

Copy code The code is as follows:

header("Content-type: image/jpeg") ;
header("Content-Length: ".strlen($_SESSION["fileInfo"][$image_id]));
echo $_SESSION["fileInfo"][$image_id];
/* *Immediately output the above session to solve the problem that the thumbnails generated under IE6 have been cleared by the unset($_SESSION['']) below before they are displayed, resulting in IE6 being unable to display the thumbnails.*/
echo $str . str_repeat(' ', 256); //Some browsers must not output until the output reaches 256 characters
ob_flush();
flush( ); // These two must be used together
unset($_SESSION['fileInfo'][$image_id]); //
exit(0);

In fact, this This also leads to the issue of server output control and browser caching, which is a bit complicated. I will study it again when I have the opportunity.

http://www.bkjia.com/PHPjc/320176.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/320176.htmlTechArticleWhen I upload and generate a thumbnail, the link displayed in the thumbnail is as follows; Copy the code as follows: img src =" /index.php?action=sys_upload_showThumbgt; As a result, the thumbnail is not displayed under ie6;...