据我所知,您无法在上传图像之前调整图像大小. (我可能错了！)但是,当您上传图像时,它会进入一个临时文件.您可以调整临时图像的大小,并将调整后的图像复制到其最终目标.

因为(似乎)你想保持宽度不变,所以你真的不需要做很多比率测试.

更新：

您应该可以简单地使用它来代替原始代码.大部分都没有变化.

// resizes an image to fit a given width in pixels.

// works with BMP, PNG, JPEG, and GIF

// $file is overwritten

function fit_image_file_to_width($file, $w, $mime = 'image/jpeg') {

list($width, $height) = getimagesize($file);

$newwidth = $w;

$newheight = $w * $height / $width;

switch ($mime) {

case 'image/jpeg':

$src = imagecreatefromjpeg($file);

break;

case 'image/png';

$src = imagecreatefrompng($file);

break;

case 'image/bmp';

$src = imagecreatefromwbmp($file);

break;

case 'image/gif';

$src = imagecreatefromgif($file);

break;

}

$dst = imagecreatetruecolor($newwidth, $newheight);

imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

switch ($mime) {

case 'image/jpeg':

imagejpeg($dst, $file);

break;

case 'image/png';

imagealphablending($dst, false);

imagesavealpha($dst, true);

imagepng($dst, $file);

break;

case 'image/bmp';

imagewbmp($dst, $file);

break;

case 'image/gif';

imagegif($dst, $file);

break;

}

imagedestroy($dst);

}

// init file vars

$pic = $_FILES['photo']['name'];

$target = 'uploads/' . basename( $_FILES['photo']['name']);

$temp_name = $_FILES['photo']['tmp_name'];

$type = $_FILES["photo"]["type"];

// Connects to your Database

mysql_connect("hostname", "username", "password") or die(mysql_error()) ;

mysql_select_db("database") or die(mysql_error()) ;

// get form data

$name = mysql_real_escape_string(isset($_POST['name']) ? $_POST['name'] : 'No name');

//Writes the information to the database

mysql_query("INSERT INTO `table` (name, photo) VALUES ('$name','$pic')") ;

// resize the image in the tmp directorys

fit_image_file_to_width($temp_name, 200, $type);

//Writes the photo to the server

if(move_uploaded_file($temp_name, $target)) {

//Tells you if its all ok

echo "The file ". basename( $_FILES['photo']['name'] ). " has been uploaded";

} else {

//Gives and error if its not

echo "Sorry, there was a problem uploading your file.";

}

?>