php縮圖的有關問題

php縮圖的問題
以下是My Code：

1.2.$ef='index\images\m_1307414811439.jpg';
3.$bs="";
4.$rr=getimagesize($ef);
5.$new=imagecreatetruecolor(300,300);
6.imagecopyresized($new,$bs,0,0,0,0,300,300,$rr[0],$rr[1]);
7.header("content-type:image/jpeg");
8.imagejpeg($new);
9.?>

出現的問題是6,7行報錯，還有亂碼

Warning: imagecopyresized(): supplied argument is not a valid Image resource in D:\PHP\r.php on line 6

Warning: Cannot modify header information - headers already sent by (output started at D:\PHP\r.php:6) in D:\PHP\r.php on line 7
????JFIF??>CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), default quality ??C $.' ",#(7),01444'9=82<.342??C 2!!22222222222222222222222222222222222222222222222222??,,"?? ???}!1AQa"q2亼?#B繃R佯$3br? %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz儎厗噲墛挀敃枟槞殺￥ウЖ┆渤吹鬥腹郝媚牌僑墒矣哉腫剄巹懺溴驍栝強蝮趲鱝??? ???w!1AQaq"2?B憽繃#3R?br? $4?%?&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz們剠唶垑姃摂晼棙櫄ⅲぅΗī炒刀犯購旅呐魄壬室釉罩棕仝懺溴驍栝牝篝貊鼬????(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(??(?

------解決方案--------------------
imagecopyresized函數的前兩個參數要求是繪圖物件變數，不是檔案名稱路徑字串之類的東西，你第2個參數傳的是$bs，然而你前面把它賦值為字串內容，所以出錯
我隨便修了下代碼，你看著思考吧


$ef='1.jpg';
$bs=imagecreatefromjpeg($ef);
$rr=getimagesize($ef);
$new=imagecreatetruecolor(300,300);
imagecopyresized($new,$bs,0,0,0,0,300,300,$rr[0],$rr[1]);
header("content-type:image/jpeg");
imagejpeg($new);

