Examples of proportional image scaling in PHP_PHP tutorial

Copy code The code is as follows:

//Isometric scaling of images

//Because PHP can only operate on resources, you need to copy the image that needs to be scaled and create it as a new resource
$src=imagecreatefromjpeg('a.jpg');

//Get the width and height of the source image
$size_src=getimagesize('a.jpg');
$w=$size_src['0'];
$h=$size_src['1' ; Length, get the scaled image width and height
if($w > $h){
$w=$max;
$h=$h*($max/$size_src['0 ']);
}else{
$h=$max;
$w=$w*($max/$size_src['1']);
}

       
                                                                                                                                (Target resource, source, start coordinates x, y of the target resource, start coordinates x, y of the source resource, width and height w, h of the target resource, width and height w, h of the source resource)
Imagecopyresampled($image, $src, 0, 0, 0, 0, $w, $h, $size_src['0'], $size_src['1']);

//Tell the browser to parse as an image
header('content-type:image/png');
imagepng($image);

//Destroy resources
imagedestroy($image);

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TechArticleCopy the code code as follows: ?php //Isometric scaling of images//Because PHP can only operate on resources , so you need to copy the image that needs to be scaled and create it as a new resource $src=im...