Auto crop image using image magic

auto-crop-image.php

//Calculate frame ratio
$frame_ratio = ( float ) $frame_w / ( float ) $frame_h ;

//Calculate image ratio
$image_ratio = ( float ) $image_w / ( float ) $image_h ;

//Checking if both ratio are same
if ( round ( $frame_ratio , 2 ) != round ( $image_ratio , 2 ) ) { 

  //Ratio are not same, in that case we need to calculate new width and height of image to crop

  //checking frame and image are of same type (portrait, landscape or square )
  if ( floor ( $image_ratio ) != floor ( $frame_ratio ) ) { 
    //here not same type, in that case we will temporary interchange the height & width to make them same type
    $temp    = $image_w ;
    $image_w = $image_h ;
    $image_h = $temp ;
  }

  //calculating new width and height by taking minimum value
  if ( $image_w < $image_h ) {
    //Portrait 
    $frame_w = $image_w ;

    //calculating height from ratio 
    $frame_h = $image_w / $frame_ratio ; 

  } else {
    //Landscape 
    $frame_h = $image_h ;

    //calculating width from ratio
    $frame_w = $image_h * $frame_ratio ; 

  }

}

//reading image 
$image = new Imagick ( $image_path ) ; 

//this will scale and crop the image from the Center 
$image -> cropThumbnailImage ( $frame_w , $frame_h ) ;