PHP image size adjustment code_PHP tutorial

Copy code The code is as follows:

/**********************
*@filename - path to the image
*@tmpname - temporary path to thumbnail
*@xmax - max width
*@ymax - max height
*/
function resize_image($filename, $tmpname, $ xmax, $ymax)
{
$ext = explode(".", $filename);
$ext = $ext[count($ext)-1];
if($ext == "jpg" || $ext == "jpeg")
$im = imagecreatefromjpeg($tmpname);
elseif($ext == "png")
$im = imagecreatefrompng($tmpname );
elseif($ext == "gif")
$im = imagecreatefromgif($tmpname);
$x = imagesx($im);
$y = imagesy($im) ;
if($x <= $xmax && $y <= $ymax)
return $im;
if($x >= $y) {
$newx = $ xmax;
$newy = $newx * $y / $x;
}
else {
$newy = $ymax;
$newx = $x / $y * $newy;
}
$im2 = imagecreatetruecolor($newx, $newy);
imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
return $im2;
}

Here is an excerpt from an article previously published by Script House. You can refer to more tips.
Collection of twenty-one practical and convenient PHP function codes

http://www.bkjia.com/PHPjc/321871.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/321871.htmlTechArticleCopy the code as follows: /********************** *@filename - path to the image *@tmpname - temporary path to thumbnail *@xmax - max width *@ymax - max height*/ function resize_...