Create square 1:1 thumbnail in PHP - php

Question

How can I set this code to return images in 1:1 (square)?
The purpose is to create a square (non stretched) thumbnail.
I've tried making changes in the 'if section'. I get a square image but stretched. I want it to be cropped.
define('THUMBNAIL_IMAGE_MAX_WIDTH', 150);
define('THUMBNAIL_IMAGE_MAX_HEIGHT', 150);
$source_image_path = {here the source filename};
$thumbnail_image_path = {here de thumb filename};
list($source_image_width, $source_image_height, $source_image_type) = getimagesize($source_image_path);
switch ($source_image_type) {
case IMAGETYPE_GIF:
$source_gd_image = imagecreatefromgif($source_image_path);
break;
case IMAGETYPE_JPEG:
$source_gd_image = imagecreatefromjpeg($source_image_path);
break;
case IMAGETYPE_PNG:
$source_gd_image = imagecreatefrompng($source_image_path);
break;
}
$source_aspect_ratio = $source_image_width / $source_image_height;
$thumbnail_aspect_ratio = THUMBNAIL_IMAGE_MAX_WIDTH / THUMBNAIL_IMAGE_MAX_HEIGHT;
if ($source_image_width <= THUMBNAIL_IMAGE_MAX_WIDTH && $source_image_height <= THUMBNAIL_IMAGE_MAX_HEIGHT) {
$thumbnail_image_width = $source_image_width;
$thumbnail_image_height = $source_image_height;
} elseif ($thumbnail_aspect_ratio > $source_aspect_ratio) {
$thumbnail_image_width = (int) (THUMBNAIL_IMAGE_MAX_HEIGHT * $source_aspect_ratio);
$thumbnail_image_height = THUMBNAIL_IMAGE_MAX_HEIGHT;
} else {
$thumbnail_image_width = THUMBNAIL_IMAGE_MAX_WIDTH;
$thumbnail_image_height = (int) (THUMBNAIL_IMAGE_MAX_WIDTH / $source_aspect_ratio);
}
$thumbnail_gd_image = imagecreatetruecolor($thumbnail_image_width, $thumbnail_image_height);
imagecopyresampled($thumbnail_gd_image, $source_gd_image, 0, 0, 0, 0, $thumbnail_image_width, $thumbnail_image_height, $source_image_width, $source_image_height);
imagejpeg($thumbnail_gd_image, $thumbnail_image_path, 90);
PS. It's not a duplicate, I've read several questions of this topic, but I'm unable to integrate it whit my code.

Answer 1

This function did the trick
function crop_img($imgSrc){
//getting the image dimensions
list($width, $height) = getimagesize($imgSrc);
//saving the image into memory (for manipulation with GD Library)
$myImage = imagecreatefromjpeg($imgSrc);
// calculating the part of the image to use for thumbnail
if ($width > $height) {
$y = 0;
$x = ($width - $height) / 2;
$smallestSide = $height;
} else {
$x = 0;
$y = ($height - $width) / 2;
$smallestSide = $width;
}
// copying the part into thumbnail
$thumbSize = min($width,$height);
$thumb = imagecreatetruecolor($thumbSize, $thumbSize);
imagecopyresampled($thumb, $myImage, 0, 0, $x, $y, $thumbSize, $thumbSize, $smallestSide, $smallestSide);
unlink($imgSrc);
imagejpeg($thumb,$imgSrc);
#imagedestroy($myImage);
#imagedestroy($thumb);
}
Found in: PHP crop image to fix width and height without losing dimension ratio

Answer 2

Use this code this code uploads image to folder and renames the file and thumb will be created with same name
HTML
<INPUT NAME="userfile[]" TYPE="file">
image directory "upimg/"
thumb directory thimg
php processing
$rename = md5(rand() * time());
$add = "upimg/" . $rename . $_FILES['userfile']['name'];
if (move_uploaded_file($_FILES['userfile']['tmp_name'], $add)) {
echo "Successfully uploaded the image";
chmod("$add", 0777);
} else {
exit;
}
$n_width = 200;
$n_height = 200;
$tsrc = "thimg/" . $rename . $_FILES['userfile']['name'];
if (!($_FILES['userfile']['type'] == "image/jpeg" OR $_FILES['userfile']['type'] == "image/gif")) {
exit;
}
if ($_FILES['userfile']['type'] == "image/gif") {
$im = ImageCreateFromGIF($add);
$width = ImageSx($im);
$height = ImageSy($im);
$newimage = imagecreatetruecolor($n_width, $n_height);
imageCopyResized($newimage, $im, 0, 0, 0, 0, $n_width, $n_height, $width, $height);
if (function_exists("imagegif")) {
Header("Content-type: image/gif");
ImageGIF($newimage, $tsrc);
} elseif (function_exists("imagejpeg")) {
Header("Content-type: image/jpeg");
ImageJPEG($newimage, $tsrc);
}
chmod("$tsrc", 0777);
}
if ($_FILES['userfile']['type'] == "image/jpeg") {
$im = ImageCreateFromJPEG($add);
$width = ImageSx($im);
$height = ImageSy($im);
$newimage = imagecreatetruecolor($n_width, $n_height);
imageCopyResized($newimage, $im, 0, 0, 0, 0, $n_width, $n_height, $width, $height);
ImageJpeg($newimage, $tsrc);
chmod("$tsrc", 0777);
}