php 基本的圖形處理函數

   覺得用php寫程式來處理圖片和做一個驗證碼比較有意思，所以就寫了一個簡單公用函數庫，跟大家分享

<?php

    /*公用函數*/

    /*載入圖片*/
    function load_picture($path)
    {
        $info = getimagesize($path);
         switch($info[2])
         {
             case 1:
                 $im = imagecreatefromgif($path);
                 return $im;
             case 2:
                 $im = imagecreatefromjpeg($path);
                 return $im;
             case 3:
                 $im = imagecreatefrompng($path);
                 return $im;
         }
    }

    /*改變圖片的大小*/
    function change_picture_size($path,$size)
    {
        $im = load_picture($path);
        $info = getimagesize($path);
        $width = $info[0]*$size;
        $height = $info[1]*$size;
        $new = imagecreatetruecolor($width,$height);
        $res = imagecopyresized($new,$im,0,0,0,0,$width,$height,$info[0],$info[1]);
        if($res)
        {
          return $new;
        }
        else
          echo  "<br>Sorry ,failed!<br>";
    }

    /*增加字型浮水印*/
    function add_fonts($im,$fontsize,$liner,$x,$y,$content)
    {
        $te = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        imagettftext($im,$fontsize,$liner,$x,$y,$te,"FZFangSong.ttf",$content);
    }

    /*增加圖片浮水印*/
    function add_water_code($dim,$sim_path,$x,$y,$cut_x,$cut_y,$width,$height)
    {
        $sim = load_picture($sim_path);
        imagecopy($dim,$sim,$x,$y,$cut_x,$cut_y,$width,$height);
    }

    /*產生驗證碼*/
    function check_code()
    {
        //產生隨機數
        for($i=0;$i<4;$i++)
        {
           $rand .=dechex(rand(0,15));
        }
        //建立圖片
        $im = imagecreatetruecolor(100,30);
        //建立調色盤
        $bg = imagecolorallocate($im,0,0,0);
        $te = imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));
        //寫隨機數
        //imagestring($im,4,rand(20,60),rand(8,16),$rand,$te);
        //寫漢字
        //$content = iconv("gbk","UTF-8","生日快樂");（windows下需要使用）
        imagettftext($im,15,0,rand(20,50),rand(16,20),$te,"FZFangSong.ttf","生日快樂");
        //畫點和畫畫線
        for($j=0;$j<5;$j++)
        {
           imageline($im,100,30,rand(0,100),rand(0,30),$te);
        }
        for($j=0;$j<100;$j++)
        {
           imagesetpixel($im,rand(0,100),rand(0,30),$te);
        }
        return $im;
    }

 

／／測試

   $path = "picture/1.jpg";
   $pic = change_picture_size($path,"0.5");
   add_fonts($pic,48,0,50,50,"中國你好");
   add_water_code($pic,"picture/2.jpg",50,200,10,20,100,100);

   //$imge = check_code();
   header("Content-type:image/jpeg");
   imagejpeg($pic);

?>