How can I resize the image before uploading it in php? On this code that I completed, I want to modify it for the purpose of placing the appropriate size for me before uploading

• Note that the code works normally and without any problems. I want to change how to scale the image only on the same code variables

if ($_POST['add']){
$img1 = $_FILES["img1"]["name"];
$temp1 = $_FILES["img1"]["tmp_name"];
$rename = "image/".uniqid();
$folder1 = "$rename".$img1;
 $videoFileType = strtolower(pathinfo($folder1,PATHINFO_EXTENSION));
 $extensions_arr = array("jpg","png","jpeg");
if(!in_array($videoFileType,$extensions_arr) {
echo "error";
}else {
$sql = "INSERT INTO -----------"
}
}