封装调用验证码check（），thumb（）缩略图，logo（

  
    

   
     
//check(); 调用验证码
   
     
//thumb('图片文件',是否覆盖，宽度，高度，'重命名前缀');生成缩略图
   
     
//logo('图片文件'，位置，是否覆盖，'重命名前缀');添加图片水印
   
     
//txt('图片文件',字号,'要添加的水印文字','水印颜色','水印透明度',位置，是否覆盖,'重命名前缀');添加文字水印
   
     
//thumb('./a.jpg',false,100,100,'logo_');
   
     
//logo('./a.jpg',5,false,'s_');
   
     
//txt('./a.jpg',50,'育机构','rand',80,1,false,'t_');
   
     
include 'inc/i.php';
   
     
function check($len=4){
   
     
 session_start();
   
     
 header('content-type:image/png');
   
     
 $fs = ['/a.ttf','/b.ttf','/f.ttf'];
   
     
 $font = dirname(__FILE__).$fs[mt_rand(0,1)];
   
     
 $w = 35*$len;
   
     
 $h = 50;
   
     
 $i = imagecreatetruecolor($w,$h);
   
     
 $c = imagecolorallocatealpha($i,0,0,0,127);
   
     
 //imagecolortransparent($i,$c);
   
     
 //imagefill($i,0,0,$c);
   
     
 imagefilledrectangle($i,0,0,$w,$h,gc($i,'ffffff',mt_rand(0,2)));
   
     
 $sss = '';
   
     
 for($j=0;$j<$len;$j++){
   
     
 $st = gs(1);
   
     
 $sss.=$st;
   
     
 imagettftext($i,mt_rand(15,25),mt_rand(-30,30),$j*35+10,mt_rand(28,38),gc($i),$font,$st);
   
     
 }
   
     
 $_SESSION['code'] = $sss;
   
     
 imagesetthickness($i,mt_rand(2,8));
   
     
 for($j=0;$j<mt_rand(5,10);$j++){
   
     
 imagefilledarc($i,mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,$w),mt_rand(0,$h),mt_rand(0,360),mt_rand(0,360),gc($i,'rand',mt_rand(100,120)),IMG_ARC_NOFILL); 
   
     
 }
   
     
 for($j=0;$j<10;$j++){
   
     
 imagettftext($i,mt_rand(10,15),mt_rand(-5,5),mt_rand(0,$w),mt_rand(0,$h),gc($i,'rand',mt_rand(100,120)),$font,gs(1));
   
     
 }
   
     
 imagepng($i);
   
     
 imagedestroy($i); 
   
     
}
   
     

   
     
function gs($n=4){
   
     
 $s = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; 
   
     
 $t = '';
   
     
 for($i=0;$i<$n;$i++){
   
     
 $t.=substr($s,mt_rand(0,strlen($s)-1),1);
   
     
 }
   
     
 return $t;
   
     
}
   
     

   
     
/**
   
     
 * 生成缩略
   
     
 */
   
     
function thumb($i,$f=false,$w=220,$h=0,$fn='s_'){
   
     
 $ii = getimagesize($i);
   
     
 if($ii[2]==2){
   
     
 if($ii[0]>$w){
   
     
 $src = imagecreatefromjpeg($i);
   
     
 $sw = $ii[0];
   
     
 $sh = $ii[1];
   
     

   
     
 $h = $h==0 ? $w/$sw*$sh : $h;
   
     
 //建立新的缩略图
   
     
 $dst = imagecreatetruecolor($w,$h);
   
     
 imagecopyresampled($dst,$src,0,0,0,0,$w,$h,$sw,$sh);
   
     
 if($f){
   
     
 imagejpeg($dst,$i);
   
     
 }else{
   
     
 $path = dirname($i).'/';
   
     
 $name = $fn.substr($i,strrpos($i,'/')+1);
   
     
 imagejpeg($dst,$path.$name); 
   
     
 }
   
     
 imagedestroy($dst);
   
     
 imagedestroy($src);
   
     
 }
   
     
 }
   
     
}
   
     

   
     
/**
   
     
 * 功能：生成水银图标，水银图标文件在inc目录中 名称 logo.png
   
     
 */
   
     
function logo($i,$p=5,$f=true,$fn='logo_'){
   
     
 $ii = getimagesize($i);
   
     
 if($ii[2]==2){
   
     
 if($ii[0]>300){
   
     
 $ni = imagecreatefromjpeg($i);
   
     
 $w = $ii[0];
   
     
 $h = $ii[1];
   
     
 
   
     
 //水银图标 logo.png 格式
   
     
 $logo = dirname(__FILE__).'/logo.png';
   
     
 $li = imagecreatefrompng($logo);
   
     
 $liw = imagesx($li);
   
     
 $lih = imagesy($li);
   
     
 
   
     
 $x = ($w-$liw)/2;
   
     
 $y = ($h-$lih)/2;
   
     
 
   
     
 $pad = 35;
   
     
 switch($p){
   
     
 case 1:
   
     
 $x = 0+$pad;
   
     
 $y = 0+$pad;
   
     
 break;
   
     
 
   
     
 case 2:
   
     
 $y = 0+$pad; 
   
     
 break;
   
     
 
   
     
 case 3:
   
     
 $x = $w-$liw-$pad;
   
     
 $y = 0+$pad;
   
     
 break;
   
     
 
   
     
 case 4:
   
     
 $x = 0+$pad;
   
     
 break;
   
     
 
   
     
 case 6:
   
     
 $x = $w-$liw-$pad;
   
     
 break;
   
     
 
   
     
 case 7:
   
     
 $x = 0+$pad;
   
     
 $y = $h-$lih-$pad;
   
     
 break;
   
     
 
   
     
 case 8:
   
     
 $y = $h-$lih-$pad;
   
     
 break;
   
     
 
   
     
 case 9:
   
     
 $x = $w-$liw-$pad;
   
     
 $y = $h-$lih-$pad;
   
     
 break; 
   
     
 }
   
     
 imagecopy($ni,$li,$x,$y,0,0,$liw,$lih);
   
     
 if($f){
   
     
 imagejpeg($ni,$i);
   
     
 }else{
   
     
 $path = dirname($i).'/';
   
     
 $name = $fn.substr($i,strrpos($i,'/')+1);
   
     
 imagejpeg($ni,$path.$name); 
   
     
 }
   
     
 imagedestroy($ni);
   
     
 imagedestroy($li);
   
     
 }
   
     
 }
   
     
}
   
     

   
     
function txt($i,$s=30,$t='版权所有',$c='rand',$a=0,$p=5,$f=true,$fn='t_'){
   
     
 $font = dirname(__FILE__).'/f.ttf';
   
     
 $ii = getimagesize($i);
   
     
 if($ii[2]==2){
   
     
 if($ii[0]>300){
   
     
 $ni = imagecreatefromjpeg($i);
   
     
 $pos = imagettfbbox($s,0,$font,$t);
   
     
 $pad = 30;
   
     
 switch($p){
   
     
 case 1://左上角
   
     
 $x = 0-$pos[0]+$pad;
   
     
 $y = 0-$pos[7]+$pad;
   
     
 break;
   
     
 
   
     
 case 2://上边 水平中央
   
     
 $x = ($ii[0]-$pos[2])/2;
   
     
 $y = 0-$pos[7]+$pad;
   
     
 break;
   
     
 
   
     
 case 3:
   
     
 $x = $ii[0]-$pos[2]-$pad;
   
     
 $y = 0-$pos[7]+$pad;
   
     
 break;
   
     
 
   
     
 case 4:
   
     
 $x = 0-$pos[0]+$pad;
   
     
 $y = ($ii[1]-$pos[6])/2;
   
     
 break;
   
     
 
   
     
 case 5:
   
     
 $x = ($ii[0]-$pos[2])/2;
   
     
 $y = ($ii[1]-$pos[6])/2;
   
     
 break;
   
     
 
   
     
 case 6:
   
     
 $x = $ii[0]-$pos[2]-$pad;
   
     
 $y = ($ii[1]-$pos[6])/2;
   
     
 break;
   
     
 
   
     
 case 7:
   
     
 $x = 0-$pos[0]+$pad;
   
     
 $y = $ii[1]-$pos[6]-$pad;
   
     
 break;
   
     
 
   
     
 case 8:
   
     
 $x = ($ii[0]-$pos[2])/2;
   
     
 $y = $ii[1]-$pos[6]-$pad;
   
     
 break;
   
     
 
   
     
 case 9:
   
     
 $x = $ii[0]-$pos[2]-$pad;
   
     
 $y = $ii[1]-$pos[6]-$pad;
   
     
 break;
   
     
 }
   
     
 imagettftext($ni,$s,0,$x,$y,gc($ni,$c,$a),$font,$t);
   
     

   
     
 if($f){
   
     
 imagejpeg($ni,$i);
   
     
 }else{
   
     
 $path = dirname($i).'/';
   
     
 $name = $fn.substr($i,strrpos($i,'/')+1);
   
     
 imagejpeg($ni,$path.$name); 
   
     
 }
   
     
 imagedestroy($ni);
   
     
 }
   
     
 }
   
     
}
   
     

   
     
function gc($i,$c='rand',$a=0){
   
     
 $color = '';
   
     
 switch($c){
   
     
 case 'white':
   
     
 $color = imagecolorallocatealpha($i,255,255,255,$a);
   
     
 break;
   
     
 case 'black':
   
     
 $color = imagecolorallocatealpha($i,0,0,0,$a);
   
     
 break;
   
     
 case 'red':
   
     
 $color = imagecolorallocatealpha($i,255,0,0,$a);
   
     
 break;
   
     
 case 'green':
   
     
 $color = imagecolorallocatealpha($i,0,255,0,$a);
   
     
 break;
   
     
 case 'rand':
   
     
 $color = imagecolorallocatealpha($i,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255),$a);
   
     
 break;
   
     
 default:
   
     
 $cc = str_split($c,2);
   
     
 $color = imagecolorallocatealpha($i,hexdec($cc[0]),hexdec($cc[1]),hexdec($cc[2]),$a);
   
     
 break;
   
     
 }
   
     
 return $color;
   
     
}
  
    

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