http - PHP Photo incorrect format -


i'm trying upload photo using php http post i'm getting following error:

warning: imagecreatefromstring(): gd-jpeg: jpeg library reports unrecoverable error: in /home/randomma/public_html/randommash/web service/main.php on line 205

warning: imagecreatefromstring(): passed data not in 'jpeg' format in /home/randomma/public_html/randommash/web service/main.php on line 205

warning: imagecreatefromstring(): couldn't create gd image stream out of data in /home/randomma/public_html/randommash/web service/main.php on line 205

warning: imagejpeg() expects parameter 1 resource, boolean given in /home/randomma/public_html/randommash/web service/main.php on line 205

here code using try save file:

imagejpeg(imagecreatefromstring(base64_decode($_post["img"], true)), "/users/images/20/".md5(uniqid()).".png");


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