PHP | imagecopyresampled() function

The imagecopyresampled() function is an inbuilt function in PHP which is used to copy a rectangular portion of one image to another image, smoothly interpolating pixel values so that, in particular, reducing the size of an image still retains a great deal of clarity.

Syntax: 

bool imagecopyresampled( resource $dst_image, resource $src_image, int $dst_x, int $dst_y, int $src_x, int $src_y, int $dst_w, int $dst_h, int $src_w, int $src_h )

Parameters:This function accepts ten parameters as mentioned above and described below: 

  • $dst_image: It specifies the destination image resource.
  • $src_image: It specifies the source image resource.
  • $dst_x: It specifies the x-coordinate of destination point.
  • $dst_y: It specifies the y-coordinate of destination point.
  • $src_x: It specifies the x-coordinate of source point.
  • $src_y: It specifies the y-coordinate of source point.
  • $dst_w: It specifies the destination width.
  • $dst_h: It specifies the destination height.
  • $src_w: It specifies the source width.
  • $src_h: It specifies the source height.

Return Value: This function returns TRUE on success or FALSE on failure.



Below given programs illustrate the imagecopyresampled() function in PHP:
Program 1 (Resample image to half of its width and height): 

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<?php
// Get dimensions of new image
list($width, $height) = getimagesize(
   
// Reduce width and height to half
$new_width = $width * 0.5;
$new_height = $height * 0.5;
   
// Resample the image
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg(
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
   
// Output the image to browser
header('Content-Type: image/jpeg');
imagejpeg($image_p, null, 100);
?>

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Output: 
 

Program 2 (Resample image with a fixed width and height): 

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<?php
// Set a  fixed height and width
$width = 300;
$height = 300;
   
// Get image dimensions
list($width_orig, $height_orig) = getimagesize(
   
// Resample the image
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefromjpeg(
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
   
// Output the image
header('Content-Type: image/jpeg');
imagejpeg($image_p, null, 100);
?>

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Output: 
 

Reference: https://www.php.net/manual/en/function.imagecopyresampled.php
 




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