PHP 圖片浮水印法

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<?php

class protect_img {    /**     * Image File variables     * @var string $file //img file     * @var string $save // saved water marked file     * @var string $im   //img resource     * @var string $tmp  //temp img for encoding     */    private $file;    private $save;    private $im;       private $tmp;      /**     * secure_img, bootstrap the class with img file     * @param string $file      */    function __construct($file) {     if (is_file($file)) {      $this->file=$file;      $this->save=‘wm‘.basename($this->file).‘.jpg‘; // new file to save watermarked image as      $this->im=$this->open_img($this->file);        // open image      $this->tmp=__DIR__.‘/‘.__CLASS__.‘.jpg‘;       // tmp img file     } else {          $this->error_img("Only works with a file");      }    }    /**     * clean up tmp file      */    function __destruct() {     if (is_file($this->tmp)) { unlink($this->tmp); }    }    /**     * private variables for watermark string     *      * @var array $watermark  file or string     * @var int $mark_alpha    watermark transpanency     * @var int $mark_font      font type     * @var int $mark_start_x  left and right position     * @var int $mark_start_y  up and down position     * @var int $mark_border  watermark boarder     * @var int $mark_height  watermark height     * @var int $mark_width   watermark width     * @var string $color1       boarder and font color     * @var string $color2       background color     * @var string $encoded    encoded image string      */    private $watermark=array(); //file or string    private $mark_alpha=50;     private $mark_font=4;    private $mark_start_x=20;    private $mark_start_y=20;    private $mark_border=9;    private $mark_height=36;    private $mark_width;    private $color1=‘0x0000FF‘;    private $color2=‘0xFFFFFF‘;    private $encoded;    /**     * __get() select private values magicly     * @param string $name     * @return string, on error display image with error      */    function __get($name) {        switch ($name) {            case ‘encoded‘: return $this->encoded; break;            case ‘save‘:    return $this->save;    break;            default:        $this->error_img(‘You called an unknown variable‘);        };    }    /**     * __set() for setting private watermark properties     * @param type $name     * @param type $value      * @return bool, return error image     */    function __set($name, $value) {     switch($name) {      case ‘add_watermark‘:       $this->watermark[]=$value;       $new=round(((strlen($value))*(((strlen($value)/2)+10))/2));       if ($new > $this->mark_width) {        $this->mark_width=$new;       }       $this->mark_height=$this->mark_height+20;      break;      case ‘watermark_alpha‘:       if (is_numeric($value) && (0 <= $value || $value <= 100)) {            $this->mark_alpha=$value;        } else {             $this->error_img($value." is not a number or between 0 and 100, plese fix this ");       }      break;      case ‘watermark_font‘:       if (is_numeric($value)) {            $this->mark_font=$value;        } else {           $this->error_img($value." is not a number, plese fix this ");       }      break;      case ‘watermark_start_x‘:       if (is_numeric($value)) {            $this->mark_start_x=$value;        } else {           $this->error_img($value." is not a number, plese fix this");       }      break;      case ‘watermark_start_y‘:       if (is_numeric($value)) {          $this->mark_start_y=$value;       } else {          $this->error_img($value." is not a number, plese fix this ");       }      break;      case ‘watermark_border‘:       if (is_numeric($value)) {            $this->mark_border=$value;        } else {             $this->error_img($value." is not a number, plese fix this ");       }      break;      case ‘watermark_height‘:       if (is_numeric($value)) {            $this->mark_height=$value;        } else {             $this->error_img($value." is not a number, plese fix this ");       }      break;      case ‘watermark_width‘:       if (is_numeric($value)) {            $this->mark_width=$value;        } else {             $this->error_img($value." is not a number, plese fix this");       }      break;      case ‘watermark_colors‘:       if(is_array($value) && count($value) == 2) {        $this->color1=array_shift($value);        $this->color2=array_shift($value);       } else {             $this->error_img("only works with an array with two values!");        }      break;      default : $this->error_img("Can‘t set the following value ".$name); break;     }     return TRUE;    }  /**   * apply water mark to image   * @param type $x pass any to unset right alignment   * @param type $y pass any to unset bottom alignment   * @return resource returns an imagecopymerge resource   */  function water_mark($x=‘right‘, $y=‘bottom‘) {   if (is_array($this->watermark) && count($this->watermark) > 0) {    $stamp=  imagecreatetruecolor($this->mark_width, $this->mark_height);    imagefilledrectangle($stamp, 0, 0, $this->mark_width-5, $this->mark_height-5, $this->color1);    imagefilledrectangle($stamp, $this->mark_border, $this->mark_border, $this->mark_width-($this->mark_border+5), $this->mark_height-($this->mark_border+5), $this->color2);    $top=$this->mark_border+11;    foreach ($this->watermark as $w) {     imagestring($stamp, $this->mark_font, $this->mark_border+11, $top, $w, $this->color1);     $top=$top+18;    }   } else {       $this->error_img(‘Watermark is not set‘);   }   // if set to right, then subtract watermark width and start width from image width    if ($x == ‘right‘) {        $start_x=imagesx($this->im)-imagesx($stamp)-$this->mark_start_x;    } else {        $start_x=$this->mark_start_x;    }   // if set to bottom, then subtract watermark height and start height from image height   if ($y == ‘bottom‘) {        $start_y=imagesy($this->im)-imagesy($stamp)-$this->mark_start_y;    } else {       $start_y=$this->mark_start_y;    }   return imagecopymerge($this->im, $stamp, $start_x, $start_y, 0, 0, imagesx($stamp), imagesy($stamp), $this->mark_alpha);  }  /**   * Send image to the browser as jpeg    */  function send_img(){   header("Content-type: image/jpeg");   imagejpeg($this->im);   imagedestroy($this->im);   exit();  }  /**   * save the water marked image to a new file in the current path   */  function save_img() {   return $this->write_img($this->save);  }    /**   * write new image to a file   * @param type $file   * @return boolean    */  function write_img($file) {   imagejpeg($this->im, $file);   imagedestroy($this->im);   return TRUE;  }  /**   * encode jpeg image as base64 with data: prefix   * @return boolean    */  function encode_img() {   imagejpeg($this->im, $this->tmp);   imagedestroy($this->im);   $t=file_get_contents($this->tmp);   $this->encoded=‘data:image/jpeg;base64,‘.base64_encode($t);   return TRUE;  }  /**   * encode img with <img /> html tag   * @return string    */  function encode_img_html($alt=‘watermark tester‘) {   if (isset($this->encoded)) {    return ‘<img src="‘.$this->encoded.‘" alt="‘.$alt.‘" />‘;   } else {        $this->error_img("You must encode this image first ");    }  }  /**   * open_img   * @param type $filename   * @return boolean    */  function open_img($file) {   $fn=explode(‘.‘, $file);   $type=array_pop($fn);   switch (strtolower($type)) { // add more mime types    case "jpg": case "jpeg": case "jpe":  return imagecreatefromjpeg($file);    break; case "gif":                    return imagecreatefromgif($file);    break; case "png":                    return imagecreatefrompng($file);    break; case "bmp": case "wbmp":       return imagecreatefromwbmp($file);    break; default:  $this->error_img("$type is invalid, use an image file [ bmp, jpg, gif or png ]");   }   return TRUE;  }    /**   * prints error in an image instead of text   * @param string $txt    */  private function error_img($txt) {    $w=600;    $h=60;    $f=12;    $stamp=  imagecreatetruecolor($w, $h);    imagefilledrectangle($stamp, 0, 0, $w-5, $h-5, ‘0xCD0000‘);    imagefilledrectangle($stamp, $this->mark_border, $this->mark_border, $w-($this->mark_border+5), $h-($this->mark_border+5), ‘0xFFFAFA‘);    imagestring($stamp, $f, $this->mark_border+11, $this->mark_border+11, $txt, ‘0xCC1100‘);    header("HTTP/1.0 500 Internal Server Error");    header("Content-type: image/jpeg");    imagejpeg($stamp);    imagedestroy($stamp);    exit();  }}

 

 

用法：

 

<?php/* * To change this template, choose Tools | Templates * and open the template in the editor. */$file=‘oldboxes.png‘;//$test=‘string‘;$test=‘save‘;//$test=‘encode‘;//$test=‘invalid_file‘;//$test=‘encode_html‘;//$test=‘invalid_img‘;require_once ‘protectimg.class.php‘;switch  ($test) {  case ‘string‘:   $img=new protect_img($file);   $img->add_watermark="Name Here";   $img->add_watermark="<[email protected]>";   $img->add_watermark="http://www.website.com";   // add watermark text first, width guessing might not work out as you want,    // just play around to get the proper width to meet your needs   $img->watermark_width=300;   $img->watermark_font=8;      /**$img->watermark_alpha=46;$img->watermark_font=5;$img->watermark_start_x=20;$img->watermark_start_y=180;$img->watermark_border=8;$img->watermark_height=70;$img->watermark_colors=array(‘0xABCDEF‘, ‘0x012345‘); */   $img->water_mark();   $img->send_img();  break;  case ‘invalid_file‘:   $img=new protect_img(‘$invalid‘);  break;  case ‘invalid_img‘:   $invalid=‘/var/log/apache2/error.log‘;         $img=new protect_img($invalid);  break;  case ‘encode‘: // return encoded string, for storing in a db, after water_mark   header("Content-type: text/plain");   $img=new protect_img($file);   //$img->add_watermark=$mark;   $img->add_watermark="Name Here";   $img->add_watermark="<[email protected]>";   $img->add_watermark="http://www.website.com";   // add watermark text first, width guessing might not work out as you want,    // just play around to get the proper width to meet your needs   $img->watermark_width=300;   $img->watermark_font=8;    $img->encode_img();   echo $img->encoded;   exit();  break;  case ‘encode_html‘: // encode image, after water_mark   header("Content-type: text/html");   $img=new protect_img($file);   //$img->add_watermark=$mark;   $img->add_watermark="Name Here";   $img->add_watermark="<[email protected]>";   $img->add_watermark="http://www.website.com";   // add watermark text first, width guessing might not work out as you want,    // just play around to get the proper width to meet your needs   $img->watermark_width=300;   $img->watermark_font=8;      $img->water_mark();   $img->encode_img();   echo $img->encode_img_html();  break;  case ‘save‘:   $img=new protect_img($file);   //$img->add_watermark=$mark;   $img->add_watermark="Name Here";   $img->add_watermark="<[email protected]>";   $img->add_watermark="http://www.website.com";   // add watermark text first, width guessing might not work out as you want,    // just play around to get the proper width to meet your needs   $img->watermark_width=300;   $img->watermark_font=8;    $img->water_mark();   $img->save_img();   $file=  str_replace(basename($_SERVER[‘SCRIPT_NAME‘]), $img->save ,$_SERVER[‘SCRIPT_NAME‘]);   header("Content-type: text/html");   echo ‘<a href="http://‘.$_SERVER[‘HTTP_HOST‘].$file.‘" >‘.$file.‘</a> saved‘;  break;}  ?>