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Script to resize PNG, JPG and GIF images using PHP keeping the aspect ratio
How this script works: What this script does, it resizes any PNG, JPG or GIF image to the given width and height and stores the image to a specified location. If the width is set to 0 it will automatically calculate the width by using the height given by keeping the aspect ratio the same is. The same goes for when the height is set to 0 and the width is given.
NOTE: Make sure the GD libraries are enabled in order to use this script.
Script:
/**
* make_thumb()
* This function creates a new image in a Thumbnail Format. It also keeps the aspect ratio of images if width or height is set to 0
* @params String $img_name This needs to be the source_image name
* @params String $filename This needs to be the Thumbnail Image Name ("path to the storage location")
* @params Int $new_w The width of the new image
* @params Int $new_h The height of the new image
* @example make_thumb("original_image.jpg","path/resized_image.jpg",10,10);
* @return resized Image
*/
function make_thumb($img_name,$filename,$new_w,$new_h){
$ext = substr(strrchr($img_name, '.'), 1);
if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext)){
$src_img=imagecreatefromjpeg($img_name);
}
if(!strcmp("png",$ext)){
$src_img=imagecreatefrompng($img_name);
}
if(!strcmp("gif",$ext)){
$src_img=imagecreatefromgif($img_name);
}
$old_x=imageSX($src_img);
$old_y=imageSY($src_img);
if($new_h <= 0){
// Calculate aspect ratio
$wRatio = $new_w / $old_x ;
$thumb_h = ceil($wRatio * $old_y);
$thumb_w = $new_w;
}else{
$thumb_w = $new_w;
}
if($new_w <= 0){
// Calculate aspect ratio
$hRatio = $new_h / $old_y ;
$thumb_w = ceil($hRatio * $old_x);
$thumb_h = $new_h;
}else{
$thumb_h = $new_h;
}
$dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);
if(!strcmp("gif",$ext)){
imagegif($dst_img,$filename);
}else if(!strcmp("png",$ext)){
imagepng($dst_img,$filename);
}
else{
imagejpeg($dst_img,$filename);
}
//destroys source and destination images.
imagedestroy($dst_img);
imagedestroy($src_img);
}