PHP加水印代碼 支持文字和圖片水印
Jun 13, 2016 am 09:37 AM
? PHP加圖片水印、文字水印類代碼，PHP加水印類，支持文字圖片水印的透明度設(shè)置、水印圖片背景透明。自己寫的一個類，因為自己開發(fā)的一套CMS中要用到，網(wǎng)上的總感覺用著不順手，希望大家也喜歡這個類，后附有類使用方法。
001
002class WaterMask{
003 public $waterType = 1; //水印類型：0為文字水印、1為圖片水印
004 public $pos = 0; //水印位置
005 public $transparent = 45; //水印透明度
006 public $waterStr = 'www.codefans.net'; //水印文字
007 public $fontSize = 16; //文字字體大小
008 public $fontColor = array(255,0,255); //水印文字顏色(RGB)
009 public $fontFile = 'AHGBold.ttf';//字體文件
010 public $waterImg = 'logo.png';//水印圖片
011 private $srcImg = '';//需要添加水印的圖片
012 private $im = '';//圖片句柄
013 private $water_im = '';//水印圖片句柄
014 private $srcImg_info = '';//圖片信息
015 private $waterImg_info = '';//水印圖片信息
016 private $str_w = '';//水印文字寬度
017 private $str_h = '';//水印文字高度
018 private $x = '';//水印X坐標(biāo)
019 private $y = '';//水印y坐標(biāo)
020 function __construct($img) {
021 $this->srcImg = file_exists($img) $img : die('"'.$img.'" 對不起，水印文件不存在!');
022 }
023 private function imginfo() {//獲取水印圖片信息，并加載。
024 $this->srcImg_info = getimagesize($this->srcImg);
025 switch ($this->srcImg_info[2]) {
026 case 3:
027 $this->im = imagecreatefrompng($this->srcImg);
028 break 1;
029 case 2:
030 $this->im = imagecreatefromjpeg($this->srcImg);
031 break 1;
032 case 1:
033 $this->im = imagecreatefromgif($this->srcImg);
034 break 1;
035 default:
036 die('水印圖片('.$this->srcImg.')水印圖片格式不對，請選擇PNG、JPEG、GIF格式的圖片。');
037 }
038 }
039 private function waterimginfo() {//獲取水印圖片并載入。
040 $this->waterImg_info = getimagesize($this->waterImg);
041 switch ($this->waterImg_info[2]) {
042 case 3:
043 $this->water_im = imagecreatefrompng($this->waterImg);
044 break 1;
045 case 2:
046 $this->water_im = imagecreatefromjpeg($this->waterImg);
047 break 1;
048 case 1:
049 $this->water_im = imagecreatefromgif($this->waterImg);
050 break 1;
051 default:
052 die('水印圖片('.$this->srcImg.')格式不對，只支持PNG、JPEG、GIF。');
053 }
054 }
055 private function waterpos() {//水印位置算法
056 switch ($this->pos) {
057 case 0: //隨機位置
058 $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
059 $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
060 break 1;
061 case 1: //上左
062 $this->x = 0;
063 $this->y = 0;
064 break 1;
065 case 2: //上中
066 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
067 $this->y = 0;
068 break 1;
069 case 3: //上右
070 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
071 $this->y = 0;
072 break 1;
073 case 4: //中左
074 $this->x = 0;
075 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
076 break 1;
077 case 5: //中中
078 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
079 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
080 break 1;
081 case 6: //中右
082 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
083 $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
084 break 1;
085 case 7: //下左
086 $this->x = 0;
087 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
088 break 1;
089 case 8: //下中
090 $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
091 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
092 break 1;
093 default: //下右
094 $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
095 $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
096 break 1;
097 }
098 }
099 private function waterimg() {
100 if ($this->srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
101 die('水印比原圖大!');
102 }
103 $this->waterpos();
104 $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
105 imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
106 $pct = $this->transparent;
107 imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
108 imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
109 }
110 private function waterstr() {
111 $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
112 $w = abs($rect[2]-$rect[6]);
113 $h = abs($rect[3]-$rect[7]);
114 $fontHeight = $this->fontSize;
115 $this->water_im = imagecreatetruecolor($w, $h);
116 imagealphablending($this->water_im,false);
117 imagesavealpha($this->water_im,true);
118 $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
119 imagefill($this->water_im,0,0,$white_alpha);
120 $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
121 imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
122 $this->waterImg_info = array(0=>$w,1=>$h);
123 $this->waterimg();
124 }
125 function output() {
126 $this->imginfo();
127 if ($this->waterType == 0) {
128 $this->waterstr();
129 }else {
130 $this->waterimginfo();
131 $this->waterimg();
132 }
133 switch ($this->srcImg_info[2]) {
134 case 3:
135 imagepng($this->im,$this->srcImg);
136 break 1;
137 case 2:
138 imagejpeg($this->im,$this->srcImg);
139 break 1;
140 case 1:
141 imagegif($this->im,$this->srcImg);
142 break 1;
143 default:
144 die('原因未知：水印添加失敗!');
145 break;
146 }
147 imagedestroy($this->im);
148 imagedestroy($this->water_im);
149 }
150}
151?>
PHP生成水印類用法：
view sourceprint?01
02$obj = new WaterMask($imgFileName);
03$obj->$waterType = 1;//水印類型：0為文字水印、1為圖片水印
04$obj->$transparent = 45;//水印透明度
05$obj->$waterStr = 'www.codefans.net';//水印文字
06$obj->$fontSize = 16;//字體大小
07$obj->$fontColor = array(255,0,255);//水印文字顏色(RGB值)
08$obj->$fontFile = = 'AHGBold.ttf'; //字體名稱
09$obj->output(); //輸出水印圖片
10?>
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
How to access a character in a string by index in PHP
Jul 12, 2025 am 03:15 AM
In PHP, you can use square brackets or curly braces to obtain string specific index characters, but square brackets are recommended; the index starts from 0, and the access outside the range returns a null value and cannot be assigned a value; mb_substr is required to handle multi-byte characters. For example: $str="hello";echo$str[0]; output h; and Chinese characters such as mb_substr($str,1,1) need to obtain the correct result; in actual applications, the length of the string should be checked before looping, dynamic strings need to be verified for validity, and multilingual projects recommend using multi-byte security functions uniformly.
How Do Generators Work in PHP?
Jul 11, 2025 am 03:12 AM
AgeneratorinPHPisamemory-efficientwaytoiterateoverlargedatasetsbyyieldingvaluesoneatatimeinsteadofreturningthemallatonce.1.Generatorsusetheyieldkeywordtoproducevaluesondemand,reducingmemoryusage.2.Theyareusefulforhandlingbigloops,readinglargefiles,or
How to prevent session hijacking in PHP?
Jul 11, 2025 am 03:15 AM
To prevent session hijacking in PHP, the following measures need to be taken: 1. Use HTTPS to encrypt the transmission and set session.cookie_secure=1 in php.ini; 2. Set the security cookie attributes, including httponly, secure and samesite; 3. Call session_regenerate_id(true) when the user logs in or permissions change to change to change the SessionID; 4. Limit the Session life cycle, reasonably configure gc_maxlifetime and record the user's activity time; 5. Prohibit exposing the SessionID to the URL, and set session.use_only
PHP get the first N characters of a string
Jul 11, 2025 am 03:17 AM
You can use substr() or mb_substr() to get the first N characters in PHP. The specific steps are as follows: 1. Use substr($string,0,N) to intercept the first N characters, which is suitable for ASCII characters and is simple and efficient; 2. When processing multi-byte characters (such as Chinese), mb_substr($string,0,N,'UTF-8'), and ensure that mbstring extension is enabled; 3. If the string contains HTML or whitespace characters, you should first use strip_tags() to remove the tags and trim() to clean the spaces, and then intercept them to ensure the results are clean.
PHP get the last N characters of a string
Jul 11, 2025 am 03:17 AM
There are two main ways to get the last N characters of a string in PHP: 1. Use the substr() function to intercept through the negative starting position, which is suitable for single-byte characters; 2. Use the mb_substr() function to support multilingual and UTF-8 encoding to avoid truncating non-English characters; 3. Optionally determine whether the string length is sufficient to handle boundary situations; 4. It is not recommended to use strrev() substr() combination method because it is not safe and inefficient for multi-byte characters.
How to URL encode a string in PHP with urlencode
Jul 11, 2025 am 03:22 AM
The urlencode() function is used to encode strings into URL-safe formats, where non-alphanumeric characters (except -, _, and .) are replaced with a percent sign followed by a two-digit hexadecimal number. For example, spaces are converted to signs, exclamation marks are converted to!, and Chinese characters are converted to their UTF-8 encoding form. When using, only the parameter values ??should be encoded, not the entire URL, to avoid damaging the URL structure. For other parts of the URL, such as path segments, the rawurlencode() function should be used, which converts the space to . When processing array parameters, you can use http_build_query() to automatically encode, or manually call urlencode() on each value to ensure safe transfer of data. just
How to set and get session variables in PHP?
Jul 12, 2025 am 03:10 AM
To set and get session variables in PHP, you must first always call session_start() at the top of the script to start the session. 1. When setting session variables, use $_SESSION hyperglobal array to assign values ??to specific keys, such as $_SESSION['username']='john_doe'; it can store strings, numbers, arrays and even objects, but avoid storing too much data to avoid affecting performance. 2. When obtaining session variables, you need to call session_start() first, and then access the $_SESSION array through the key, such as echo$_SESSION['username']; it is recommended to use isset() to check whether the variable exists to avoid errors
How to prevent SQL injection in PHP
Jul 12, 2025 am 03:02 AM
Key methods to prevent SQL injection in PHP include: 1. Use preprocessing statements (such as PDO or MySQLi) to separate SQL code and data; 2. Turn off simulated preprocessing mode to ensure true preprocessing; 3. Filter and verify user input, such as using is_numeric() and filter_var(); 4. Avoid directly splicing SQL strings and use parameter binding instead; 5. Turn off error display in the production environment and record error logs. These measures comprehensively prevent the risk of SQL injection from mechanisms and details.
