PHP processing - watermark images (text, etc.)

<?php
// Specify the image path 
//1.  Open the image to be watermarked 
$img_logf_src="https://img1.baidu.com/it/u=554809536,2732110137&fm=253&fmt=auto&app=138&f=JPEG?w=500&h=560";
$image = imagecreatefromjpeg($img_logf_src);
// Get picture information 
$info = getimagesize($img_logf_src);
$type = image_type_to_extension($info[2],false);// Get the image extension 
//2.  Draw an image on the canvas 
$bai = imagecolorallocate($image, 255, 255, 255);
$bai2 = imagecolorallocate($image, 0, 0, 0);
// typeface 
$fontfil=dirname(__FILE__).'/SimHei.ttf';// typeface   Absolute path 
//3.  Set watermark text 
$text = 'XXXXXXX project '."\n";
$city= ' Chengdu ';
$user_name= '【 Zhang San 】'."\n";
$today = date( "D M j G:i:s T Y ");// Time 
$text_center=$user_name.$text.$city.$today;
$font_siz=(int)($info[0]/30);// font size  0= wide  1= high 
$font_y=(int)($info[1]-($info[0]/10)-20);// coordinate y
$font_x=(int)(($info[0]/10)-($info[0]/10)+10);// coordinate X
imagettftext($image, $fon