What is the difference between imagecopyresized() and imagecopyresampled() in PHP, and when should each be used?

The main difference between imagecopyresized() and imagecopyresampled() in PHP is the quality of the resized image. imagecopyresized() simply resizes the image, which can result in a loss of quality, especially when scaling down. imagecopyresampled() uses a more advanced algorithm to resample the image, resulting in a higher quality resized image. When resizing images without worrying too much about quality, imagecopyresized() can be used. However, when maintaining image quality is important, especially when scaling down images, imagecopyresampled() should be used. 

// Example using imagecopyresized()
$newWidth = 100;
$newHeight = 100;

$sourceImage = imagecreatefromjpeg('source.jpg');
$destinationImage = imagecreatetruecolor($newWidth, $newHeight);

imagecopyresized($destinationImage, $sourceImage, 0, 0, 0, 0, $newWidth, $newHeight, imagesx($sourceImage), imagesy($sourceImage));

imagejpeg($destinationImage, 'resized_image.jpg');

imagedestroy($sourceImage);
imagedestroy($destinationImage);
```

```php
// Example using imagecopyresampled()
$newWidth = 100;
$newHeight = 100;

$sourceImage = imagecreatefromjpeg('source.jpg');
$destinationImage = imagecreatetruecolor($newWidth, $newHeight);

imagecopyresampled($destinationImage, $sourceImage, 0, 0, 0, 0, $newWidth, $newHeight, imagesx($sourceImage), imagesy($sourceImage));

imagejpeg($destinationImage, 'resized_image.jpg');

imagedestroy($sourceImage);
imagedestroy($destinationImage);

Keywords

imagecopyresized imagecopyresampled PHP image manipulation resizing

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