PHP generates thumbnails of uploaded images according to the specified size and proportional scaling

PHP generates thumbnails of uploaded images according to the specified size and proportional scaling_PHP tutorial

WBOY

Release： 2016-07-20 11:07:44

Original

767 people have browsed it

php tutorial to generate thumbnails of uploaded images by scaling them proportionally to the specified size
/**
* *
*Constant ratio scaling
* @param unknown_type $srcImage Source image path
* @param unknown_type $toFile Target image path
* @param unknown_type $maxWidth Maximum width
* @param unknown_type $maxHeight Maximum height
* @param unknown_type $imgQuality Image quality
* @return unknown
*/

function resize($srcImage,$toFile,$maxWidth = 100,$maxHeight = 100,$imgQuality=100)
{

list($width, $height, $type, $attr) = getimagesize($srcImage);
if($width < $maxWidth | | $height < $maxHeight) return ;
switch ($type) {
case 1: $img = imagecreatefromgif($srcImage); break;
case 2: $img = imagecreatefromjpeg($srcImage) ; break;
case 3: $img = imagecreatefrompng($srcImage); break;
}
$scale = min($maxWidth/$width, $maxHeight/$height); //Find bloom Scale

if($scale < 1) {
$newWidth = floor($scale*$width);
$newHeight = floor($scale*$height);
$ newImg = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($newImg, $img, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
$newName = " ";
$toFile = preg_replace("/(.gif|.jpg|.jpeg|.png)/i","",$toFile);

switch($type) {
        case 1: if(imagegif($newImg, "$toFile$newName.gif", $imgQuality))
        return "$newName.gif"; break;
       case 2: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
                                                                                   return "$newName.jpg"; ))
return "$newName.png"; break;
default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
return "$newName.jpg" ; break;
}
imagedestroy($newImg);
}
imagedestroy($img);
return false;
}