[grinditwp]

Jag har en funktion som fungerar fint som jag brukar använda mig av.
Vad den gör är att spara en thumbnail lokalt.

Funktionen kan användas till mycket mera oxå, men bör fungera fint till det du vill.

Kanske hjälper? Anyway, feel free.

Snabbt förklarat:

$src = Bilden du vill skapa thumbnail av.
$dst = Vart vill du spara bilden.
$dstx = Bredd
$dsty = Höjd
$quality = Kvalité, default 75. (0-100)
$text = Om du vill ha in ett textfält i bilden, default = ingentext.

<?
function resizeImage($src, $dst, $dstx, $dsty, $quality = 75, $text = ''){

$allowedExtensions = 'jpg jpeg gif png';

$name = explode(".", $src);
$currentExtensions = $name[count($name)-1];
$extensions = explode(" ", $allowedExtensions);

for($i=0; count($extensions)>$i; $i=$i+1){
if($extensions[$i]==$currentExtensions)
{ $extensionOK=1; 
$fileExtension=$extensions[$i]; 
break; }
}

if($extensionOK){

$size = getImageSize($src);
$width = $size[0];
$height = $size[1];

if($width >= $dstx AND $height >= $dsty){

$proportion_X = $width / $dstx;
$proportion_Y = $height / $dsty;

if($proportion_X > $proportion_Y ){
$proportion = $proportion_Y;
}else{
$proportion = $proportion_X;
}
$target['width'] = $dstx * $proportion;
$target['height'] = $dsty * $proportion;

$original['diagonal_center'] = 
round(sqrt(($width*$width)+($height*$height))/2);
$target['diagonal_center'] = 
round(sqrt(($target['width']*$target['width'])+
($target['height']*$target['height']))/2);

$crop = round($original['diagonal_center'] - $target['diagonal_center']);

if($proportion_X < $proportion_Y ){
$target['x'] = 0;
$target['y'] = round((($height/2)*$crop)/$target['diagonal_center']);
}else{
$target['x'] = round((($width/2)*$crop)/$target['diagonal_center']);
$target['y'] = 0;
}

if($fileExtension == "jpg" OR $fileExtension=='jpeg'){ 
$from = imagecreatefromjpeg($src); 
}elseif ($fileExtension == "gif"){ 
$from = imagecreatefromgif($src); 
}elseif ($fileExtension == 'png'){
 $from = imagecreatefrompng($src);
}

$new = imagecreatetruecolor ($dstx,$dsty);

imagecopyresampled ($new, $from, 0, 0, $target['x'], 
$target['y'], $dstx, $dsty, $target['width'], $target['height']);

//ADD TEXT
if($text != ''){
$im = $new;
if(!$im)
{
 die("");
}
$yellow = imagecolorallocate($im, 255, 255, 0);
$black = imagecolorallocate($im, 0, 0, 0);
$width = imagesx($im);
$height = imagesy($im);
imagefilledrectangle($im, 0, ($height-20) , $width, $height, $black);
$font = 4;
$leftTextPos = ( $width - imagefontwidth($font)*strlen($text) )/2;
imagestring($im, $font, $leftTextPos, $height-18, $text, $yellow);
$new = $im;
}


 if($fileExtension == "jpg" OR $fileExtension == 'jpeg'){ 
imagejpeg($new, $dst, $quality); 
}elseif ($fileExtension == "gif"){ 
imagegif($new, $dst); 
}elseif ($fileExtension == 'png'){
imagepng($new, $dst);
}
}
}
}
?>

För att bestämma bildens storlek brukar jag köra det något dynamiska systemet:

$setwidth = 120;
$setheight = 80;

list($width, $height, $type, $attr) = getimagesize('mapp/uppladdadfil.jpg');
  if($width > $setwidth){
  $pr = $setwidth/$width;
  $w = $pr * $width;
  $h = $pr * $height;
  } else {
  	$w = $width;
  	$h = $height;
  }
  if($h > $setheight){
  $pr = $setheight/$h;
  $w = $pr * $w;
  $h = $pr * $h;
  } else {
  	$w = $w;
  	$h = $h;
  }
resizeImage('mapp/uppladdadfil.jpg', 'mapp/nyfil.jpg', $w, $h, 100);