imagecrop()

(PHP 5 >= 5.5.0, PHP 7)

Crop an image to the given rectangle

说明

imagecrop(resource $image,array $rect): resource

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

参数

$image

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

$rect

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.

<?php
$im = imagecreatefrompng('example.png');
$size = min(imagesx($im), imagesy($im));
$im2 = imagecrop($im, ['x' => 0, 'y' => 0, 'width' => $size, 'height' => $size]);
if ($im2 !== FALSE) {
    imagepng($im2, 'example-cropped.png');
    imagedestroy($im2);
}
imagedestroy($im);
?>

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.
<?php
// Desired function call.
$cropped = imagecrop( $image, array( 'x' => $x, 'y' => $y, 'width' => $width, 'height' => $height ) );
// Equivalent function which works in both PHP pre 5.6.12 and 5.6.12+.
$cropped = imagecreatetruecolor( $width, $height );
imagecopyresampled( $cropped, $image, 0, 0, $x, $y, $width, $height, $width, $height );
?>

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);