curl和php问题—空白页

Question

I am attempting to download images saved in a url to a local folder, and have made the following attempt at doing so with curl. I would like to know if it is necessary to include curl or download it seperateley, or if my function will just work. I would like to know if there are any obvious problems with my implementation below. I am aware of the sql vulnerability and I am switching to prepared statements. I have trimmed non relevant parts of the code for brevity.

edit: the function is out of the while loop. The page displays if I comment out the call the the function, otherwise I only get a blank page. Why is this

<?php
header("Content-Type: text/html; charset=utf-8");
if (isset($_GET["cmd"]))

  $cmd = $_GET["cmd"];

else

  die("You should have a 'cmd' parameter in your URL");

 $pk = $_GET["pk"];

$con = mysql_connect("localhost","someuser","notreal");

if(!$con)

{

die('Connection failed because of' .mysql_error());

}
mysql_query('SET NAMES utf8'); 

mysql_select_db("somedb",$con);

if($cmd=="GetAuctionData")

{

$sql="SELECT * FROM AUCTIONS WHERE ARTICLE_NO ='$pk'";

$sql2="SELECT ARTICLE_DESC FROM AUCTIONS WHERE ARTICLE_NO ='$pk'";

$htmlset = mysql_query($sql2);

$row2 = mysql_fetch_array($htmlset);



$result = mysql_query($sql);

function savePicture($imageUrl) {
    $ch = curl_init();
    curl_setopt ($ch, CURLOPT_URL, $lastImg);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, 0);
    $fileContents = curl_exec($ch);
    curl_close($ch);
    $newImg = imagecreatefromstring($fileContents);
    return imagejpeg($newImg, "./{$pk}.jpg",100);
}

while ($row = mysql_fetch_array($result))
{



$lastImg = $row['PIC_URL']; 


savePicture($lastImg);


<div id='rightlayer'>

<img src='./".$pk.".jpg' width='".$outputWidth."' height='".$outputHeight."'>


</div>

</div>

</div>";



}



}

mysql_free_result($result);

Answer 1

You'll get an error if you declare a function inside a loop when the loop is run more than one time. So you should declare the savePicture function outside while .

Answer 2

I'd take the function definition out of the while block.

In my opinion your using curl for the sake of using curl here, a simpler method would be to use file get contents .