PHP development picture watermark tutorial - opening pictures

<?php
    /*打开图片*/
    //配置图片路径
    $src = "https://img.php.cn/upload/course/000/000/004/581454f755fb1195.jpg";
    //获取图片的基本信息
    $info=getimagesize($src);
    //通过图像的编号来获取图片的类型
    $type=image_type_to_extension($info[2],false);
    //内存中创建一个和我们图像类型一致的图像
    $fun = "imagecreatefrom{$type}";
    //把要操作的图片复制到内存中
    $image=$fun($src);
?>

The first step of adding a picture in php is the same as adding text. Open the picture, read the file information, get the type of the picture, and then create an identical picture in the memory.