PHP - Cropping images based on lower dimensions (Width / Height)

Following code crop images baased on lower dimention (Width / Height)

Following is the funtion with image url,

     public function croppThis($target_url) {

$this->jpegImgCrop($target_url);

}

$target_url - is Name of image.

Crop image bases on less width / Height:

public function jpegImgCrop($target_url) {//support

$image = imagecreatefromjpeg($target_url);
$filename = $target_url;
  $width = imagesx($image);
  $height = imagesy($image);
  $image_type = imagetypes($image); //IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP

  if($width==$height) {

    $thumb_width = $width;
    $thumb_height = $height;

} elseif($width<$height) {

  $thumb_width = $width;
  $thumb_height = $width;

} elseif($width>$height) {

$thumb_width = $height;
$thumb_height = $height;

} else {
  $thumb_width = 150;
  $thumb_height = 150;
}

  $original_aspect = $width / $height;
$thumb_aspect = $thumb_width / $thumb_height;

if ( $original_aspect >= $thumb_aspect ) {

 // If image is wider than thumbnail (in aspect ratio sense)
    $new_height = $thumb_height;
    $new_width = $width / ($height / $thumb_height);

  }
else {
  // If the thumbnail is wider than the image
  $new_width = $thumb_width;
    $new_height = $height / ($width / $thumb_width);
}

$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );

// Resize and crop
imagecopyresampled($thumb,
  $image,
  0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
  0 - ($new_height - $thumb_height) / 2, // Center the image vertically
  0, 0,
  $new_width, $new_height,
  $width, $height);
 
imagejpeg($thumb, $filename, 80);

}