imagecrop()

(PHP 5 >= 5.5.0, PHP 7)

Crop an image to the given rectangle

说明

Crops an image to the given rectangular area and returns the resulting image. The given$imageis not modified.

参数

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

The cropping rectangle as array with keysx,y,widthandheight.

返回值

Return cropped image resource on success 或者在失败时返回FALSE.

范例

imagecrop() example

This example shows how to crop an image to a square area.

参见

• imagecropauto()Crop an image automatically using one of the available modes

It appears that imagecrop() will output a black line along the bottom the resulting image until version 5.6.12. Your only choices are to upgrade PHP or use imagecopyresampled().
http://php.net/ChangeLog-5.php#5.6.12 (bug #67447)

Use imagecopyresampled to crop your image instead, and it should work correctly in PHP 5.5+ without any black lines. 

To get the center crop of a image in php:
      
$new = imagecreatefromjpeg($uploadedfile);
  $crop_width = imagesx($new);
  $crop_height = imagesy($new);
        
      $size = min($crop_width, $crop_height);
      
      
      if($crop_width >= $crop_height) {
      $newx= ($crop_width-$crop_height)/2;
      
      $im2 = imagecrop($new, ['x' => $newx, 'y' => 0, 'width' => $size, 'height' => $size]);
      }
      else {
        $newy= ($crop_height-$crop_width)/2;
      
        $im2 = imagecrop($new, ['x' => 0, 'y' => $newy, 'width' => $size, 'height' => $size]);
        }
      
        
  imagejpeg($im2,$filename,90);

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