在PHP中将图像裁剪为正方形，而不是将大小调整为相同的纵横比

我在Joomla中使用一个函数来调整上传图像时的大小。然而，该函数使用最大宽度和最大高度的输入将图像调整为与开始时相同的纵横比。。。即，插件将调整图像大小为最大高度或最大宽度（取决于上传图像的最大值）。

然而，我希望能够裁剪图像以填充最大高度/最大宽度，并从中心裁剪边缘（以最大值为准）。

有人能帮忙吗？

这是我目前的功能。。。谢谢

<?php
/**
 * easy image resize function
 * @param  $file - file name to resize
 * @param  $string - The image data, as a string
 * @param  $width - new image width
 * @param  $height - new image height
 * @param  $proportional - keep image proportional, default is no
 * @param  $output - name of the new file (include path if needed)
 * @param  $delete_original - if true the original image will be deleted
 * @param  $use_linux_commands - if set to true will use "rm" to delete the image, if false will use PHP unlink
 * @param  $quality - enter 1-100 (100 is best quality) default is 100
 * @return boolean|resource
 */
  function smart_resize_image($file,
                          $string             = null,
                          $width              = 0, 
                          $height             = 0, 
                          $proportional       = false, 
                          $output             = 'file', 
                          $delete_original    = true, 
                          $use_linux_commands = false,
                          $quality = 100
     ) {
if ( $height <= 0 && $width <= 0 ) return false;
if ( $file === null && $string === null ) return false;
# Setting defaults and meta
$info                         = $file !== null ? getimagesize($file) : getimagesizefromstring($string);
$image                        = '';
$final_width                  = 0;
$final_height                 = 0;
list($width_old, $height_old) = $info;
$cropHeight = $cropWidth = 0;
# Calculating proportionality
if ($proportional) {
  if      ($width  == 0)  $factor = $height/$height_old;
  elseif  ($height == 0)  $factor = $width/$width_old;
  else                    $factor = min( $width / $width_old, $height / $height_old );
  $final_width  = round( $width_old * $factor );
  $final_height = round( $height_old * $factor );
}
else {
  $final_width = ( $width <= 0 ) ? $width_old : $width;
  $final_height = ( $height <= 0 ) ? $height_old : $height;
  $widthX = $width_old / $width;
  $heightX = $height_old / $height;
  $x = min($widthX, $heightX);
  $cropWidth = ($width_old - $width * $x) / 2;
  $cropHeight = ($height_old - $height * $x) / 2;
}
# Loading image to memory according to type
switch ( $info[2] ) {
  case IMAGETYPE_JPEG:  $file !== null ? $image = imagecreatefromjpeg($file) : $image = imagecreatefromstring($string);  break;
  case IMAGETYPE_GIF:   $file !== null ? $image = imagecreatefromgif($file)  : $image = imagecreatefromstring($string);  break;
  case IMAGETYPE_PNG:   $file !== null ? $image = imagecreatefrompng($file)  : $image = imagecreatefromstring($string);  break;
  default: return false;
}

# This is the resizing/resampling/transparency-preserving magic
$image_resized = imagecreatetruecolor( $final_width, $final_height );
if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
  $transparency = imagecolortransparent($image);
  $palletsize = imagecolorstotal($image);
  if ($transparency >= 0 && $transparency < $palletsize) {
    $transparent_color  = imagecolorsforindex($image, $transparency);
    $transparency       = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
    imagefill($image_resized, 0, 0, $transparency);
    imagecolortransparent($image_resized, $transparency);
  }
  elseif ($info[2] == IMAGETYPE_PNG) {
    imagealphablending($image_resized, false);
    $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
    imagefill($image_resized, 0, 0, $color);
    imagesavealpha($image_resized, true);
  }
}
imagecopyresampled($image_resized, $image, 0, 0, $cropWidth, $cropHeight, $final_width, $final_height, $width_old - 2 * $cropWidth, $height_old - 2 * $cropHeight);

# Taking care of original, if needed
if ( $delete_original ) {
  if ( $use_linux_commands ) exec('rm '.$file);
  else @unlink($file);
}
# Preparing a method of providing result
switch ( strtolower($output) ) {
  case 'browser':
    $mime = image_type_to_mime_type($info[2]);
    header("Content-type: $mime");
    $output = NULL;
  break;
  case 'file':
    $output = $file;
  break;
  case 'return':
    return $image_resized;
  break;
  default:
  break;
}
# Writing image according to type to the output destination and image quality
switch ( $info[2] ) {
  case IMAGETYPE_GIF:   imagegif($image_resized, $output);    break;
  case IMAGETYPE_JPEG:  imagejpeg($image_resized, $output, $quality);   break;
  case IMAGETYPE_PNG:
    $quality = 9 - (int)((0.9*$quality)/10.0);
    imagepng($image_resized, $output, $quality);
    break;
  default: return false;
}
return true;
  }