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PHP Upload imagen con thumbs resize and transparent png

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AL subir imagen png, se deben pasar al directorio con transparencia

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  1. $myfile=$_FILES["youimage"];
  2. function ismyimage($myfile)
  3. {
  4.     if((($myfile["type"] == "image/gif") || ($myfile["type"] == "image/jpg") || ($myfile["type"] == "image/jpeg") || ($myfile["type"] == "image/png")) && ($myfile["size"] <= 2097152 /*2mb*/) ) return true; 
  5.     else return false;
  6. }
  7.  
  8. function upload_file($myfile)
  9. {           
  10.  
  11.             if(ismyimage($myfile)){
  12.                 $information=getimagesize($myfile["tmp_name"]);
  13.                 $mywidth=$information[0];
  14.                 $myheight=$information[1];
  15.  
  16.                 $newwidth=$mywidth;
  17.                 $newheight=$myheight;
  18.                 while(($newwidth > 600) || ($newheight > 400 )){
  19.                         $newwidth = $newwidth-ceil($newwidth/100);
  20.                         $newheight = $newheight-ceil($newheight/100);
  21.                     } 
  22.  
  23.                 $files=$myfile["name"];
  24.  
  25.                 if($myfile["type"] == "image/gif"){
  26.                 $tmp=imagecreatetruecolor($newwidth,$newheight);
  27.                 $src=imagecreatefromgif($myfile["tmp_name"]);
  28.                 imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $mywidth, $myheight);
  29.                 $con=imagegif($tmp, $files);
  30.                 imagedestroy($tmp);
  31.                 imagedestroy($src);
  32.                 if($con){return true;} else {return false;}
  33.                 }
  34.                 else if(($myfile["type"] == "image/jpg") || ($myfile["type"] == "image/jpeg") ) {
  35.                 $tmp=imagecreatetruecolor($newwidth,$newheight);
  36.                 $src=imagecreatefromjpeg($myfile["tmp_name"]); 
  37.                 imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $mywidth, $myheight);
  38.                 $con=imagejpeg($tmp, $files);
  39.                 imagedestroy($tmp);
  40.                 imagedestroy($src);
  41.                 if($con){  return true;} else {return false;}
  42.                     }
  43.                 else if($myfile["type"] == "image/png") {
  44.                 $tmp=imagecreatetruecolor($newwidth,$newheight);
  45.                 $src=imagecreatefrompng($myfile["tmp_name"]);
  46.                 imagealphablending($tmp, false);
  47.                 imagesavealpha($tmp,true);
  48.                 $transparent = imagecolorallocatealpha($tmp, 255, 255, 255, 127);
  49.                 imagefilledrectangle($tmp, 0, 0, $newwidth, $newheight, $transparent); 
  50.                 imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $mywidth, $myheight);
  51.                 $con=imagepng($tmp, $files);
  52.                 imagedestroy($tmp);
  53.                 imagedestroy($src);
  54.                 if($con){ return true;} else {return false;}
  55.                     }
  56.  
  57.                 }
  58.                 else return false;
  59. }

URL: http://stackoverflow.com/questions/32243/can-png-image-transparency-be-preserved-when-using-phps-gdlib-imagecopyresample

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