What are the necessary steps to save multiple images as one image in PHP?

To save multiple images as one image in PHP, you can use the GD library to create a new blank image, then copy and paste the individual images onto this new image. This can be achieved by loading each image using imagecreatefromjpeg(), imagecreatefrompng(), or other similar functions, and then using imagecopy() or imagecopymerge() to combine them onto the new image. 

// Create a blank image with the desired dimensions
$newImage = imagecreatetruecolor($width, $height);

// Load each individual image
$image1 = imagecreatefromjpeg('image1.jpg');
$image2 = imagecreatefrompng('image2.png');

// Copy and paste the individual images onto the new image
imagecopy($newImage, $image1, 0, 0, 0, 0, imagesx($image1), imagesy($image1));
imagecopy($newImage, $image2, imagesx($image1), 0, 0, 0, imagesx($image2), imagesy($image2));

// Save the new image as a single image file
imagejpeg($newImage, 'combined_image.jpg');

// Free up memory by destroying the individual images
imagedestroy($newImage);
imagedestroy($image1);
imagedestroy($image2);

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