PHP implements a method to generate thumbnails of uploaded images by scaling them proportionally to a specified size, _PHP Tutorial

php implements the method of generating thumbnails of uploaded images by scaling them proportionally to the specified size,

The example in this article describes how PHP implements scaling to generate thumbnails of uploaded images according to a specified size. Share it with everyone for your reference. The specific implementation method is as follows:

Copy code The code is as follows:

/**
* *
*Constantial 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 the bloom ratio
     
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"; break;
case 3: if(imagepng($newImg, "$toFile$newName.png", $imgQuality))
           return "$newName.png"; break;
​​​​Default: if(imagejpeg($newImg, "$toFile$newName.jpg", $imgQuality))
           return "$newName.jpg"; break;
}
Imagedestroy($newImg);
}
Imagedestroy($img);
Return false;
}

I hope this article will be helpful to everyone’s PHP programming design.

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