php create square image resized to best fit

GD2.php

<?php
// Note: Has problem with color spaces if input image is not sRGB some color info will be dropped. Loss of saturation/vibrance may be noticable.
function create_square_image($original_file, $destination_file=NULL, $square_size = 96){
	// get width and height of original image
	$imagedata = getimagesize($original_file);
	$original_width = $imagedata[0];	
	$original_height = $imagedata[1];
	
	if($original_width > $original_height){
		$new_height = $square_size;
		$new_width = $new_height*($original_width/$original_height);
	}
	if($original_height > $original_width){
		$new_width = $square_size;
		$new_height = $new_width*($original_height/$original_width);
	}
	if($original_height == $original_width){
		$new_width = $square_size;
		$new_height = $square_size;
	}
	
	$new_width = round($new_width);
	$new_height = round($new_height);
	
	// load the image
	if(substr_count(strtolower($original_file), ".jpg") or substr_count(strtolower($original_file), ".jpeg")){
		$original_image = imagecreatefromjpeg($original_file);
	}
	if(substr_count(strtolower($original_file), ".gif")){
		$original_image = imagecreatefromgif($original_file);
	}
	if(substr_count(strtolower($original_file), ".png")){
		$original_image = imagecreatefrompng($original_file);
	}
	
	$smaller_image = imagecreatetruecolor($new_width, $new_height);
	$square_image = imagecreatetruecolor($square_size, $square_size);
	
	imagecopyresampled($smaller_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);
	
	if($new_width>$new_height){
		$difference = $new_width-$new_height;
		$half_difference =  round($difference/2);
		imagecopyresampled($square_image, $smaller_image, 0-$half_difference+1, 0, 0, 0, $square_size+$difference, $square_size, $new_width, $new_height);
	}
	if($new_height>$new_width){
		$difference = $new_height-$new_width;
		$half_difference =  round($difference/2);
		imagecopyresampled($square_image, $smaller_image, 0, 0-$half_difference+1, 0, 0, $square_size, $square_size+$difference, $new_width, $new_height);
	}
	if($new_height == $new_width){
		imagecopyresampled($square_image, $smaller_image, 0, 0, 0, 0, $square_size, $square_size, $new_width, $new_height);
	}
	

	//// if no destination file was given then display a png		
	//if(!$destination_file){
	//	imagepng($square_image,NULL,9);
	//}
	
	// save the smaller image FILE if destination file given
	if(substr_count(strtolower($destination_file), ".jpg")){
		imagejpeg($square_image,$destination_file,100);
	}
	if(substr_count(strtolower($destination_file), ".gif")){
		imagegif($square_image,$destination_file);
	}
	if(substr_count(strtolower($destination_file), ".png")){
		imagepng($square_image,$destination_file,9);
	}

	imagedestroy($original_image);
	imagedestroy($smaller_image);
	imagedestroy($square_image);

}

ImageMagick.php

<?php
// Note: If you are trying to manipulate a uploaded file and then save the file all in the same request with Apache + mod_dav this will fail.
function create_square_image($original_file, $destination_file=NULL, $square_size = 96){
    // Over-write original.
    if (!$destination_file) {
        $destination_file = $original_file;
    }

    $im = new Imagick($original_file);

    // Ensure image colorspace is SRGB.
    if ($im->getColorspace() !== imagick::COLORSPACE_SRGB) {
        $im->transformImageColorspace(imagick::COLORSPACE_SRGB);
    }

    // Remove pixels that are the background color/within fuzzy selection. // Note: The tolerance here was too high, so I just commented it out, results may vary.
    //$im->trimImage(20000); // Quantum Range is probably 65535 can get with $im->getQuantumRange() which returns an associative array.

    // Resize image to a square size with best fit.
    $im->resizeImage($square_size, $square_size, Imagick::FILTER_LANCZOS, 1, TRUE);
    $im->setImageBackgroundColor("white");

    // Decide how to crop this image to the appropriate square size.
    $w = $im->getImageWidth();
    $h = $im->getImageHeight();

    $off_top=0;
    $off_left=0;

    if ($w > $h){
        $off_top = (($square_size-$h)/2) * -1;
    } else {
        $off_left = (($square_size-$w)/2) * -1;
    }

    $im->extentImage($square_size, $square_size, $off_left, $off_top);
    $im->writeImage($destination_file);
}

To Install PHP Imagemagick.

apt-get install php-imagick

Verify it loaded as an extension.

php -m | grep imagick

Restart Apache

service apache2 restart

To put image magick for php 7.2 into a docker container.

sudo apt-get update && sudo apt-get install -y --no-install-recommends libmagickwand-dev && sudo rm -rf /var/lib/apt/lists/* && sudo pecl install imagick-3.4.3 && sudo docker-php-ext-enable imagick