How to implement proportional interception of images in PHP

This article mainly introduces the method of php to realize proportional interception of pictures, involving php's operation skills related to reading, computing and generating graphics. It has certain reference value. Friends in need can refer to it

The example in this article describes the method of intercepting pictures proportionally in PHP. Share it with everyone for your reference, the details are as follows:

filename = 'img/test.jpg';
$all_type = array(
"jpg"  => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
"gif"  => array("create"=>"ImageCreateFromGIF" , "output"=>"imagegif"  , "exn"=>".gif"),
"jpeg"  => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
"png"  => array("create"=>"imagecreatefrompng" , "output"=>"imagepng"  , "exn"=>".png"),
"wbmp"  => array("create"=>"imagecreatefromwbmp", "output"=>"image2wbmp" , "exn"=>".wbmp")
);
$imgtype = getimagesize($filename);
$width = $imgtype[0];
$height = $imgtype[1];
$type = str_replace('image/','',$imgtype['mime']);
$func_create = $all_type[$type]['create'];
$func_output = $all_type[$type]['output'];
$x = $y =0;
if(($width * 100)>($height * 120))
{
$newwidth = ceil($height * 120/100);
$newheight = $height;
$x = ($width-$newwidth)/2;
}
elseif(($width * 100)<($height * 120))
{
$newheight = ceil($width * 100/120);
$newwidth = $width;
$y = ($height-$newheight)/2;
}
else
{
$newheight = $height;
$newwidth = $width; 
}
// Load
$thumb = imagecreatetruecolor($newwidth, $newheight);
$source = $func_create($filename);
// Resize
imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $newwidth, $newheight);
// Output
$func_output($thumb,&#39;a.jpeg&#39;);

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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