Bueno, no sé si ya te servirá porque te han ayudado otros, pero de todos modos si no es a ti a alguien le podría servir:
Código PHP:
<?php
class Imagen {
private $exist = false;
private $width = 0;
private $height = 0;
private $source = null;
private $thumb = null;
function Imagen($img) {
if (file_exists($img)) {
list($wi, $he, $tip) = getimagesize($img);
$this->width = $wi;
$this->height = $he;
if ($tip == 1) $this->source = imagecreatefromgif($img);
elseif ($tip == 2) $this->source = imagecreatefromjpeg($img);
elseif ($tip == 3) $this->source = imagecreatefrompng($img);
$this->exist = true;
}
}
private function createThumb($w, $h) {
$this->thumb = imagecreatetruecolor($w, $h);
}
function makeThumb($ruta, $w, $h, $opc = false) {
if ($this->exist) {
$wi = $this->width;
$he = $this->height;
if ($w) {
$wp = $w;
$hp = round(($he / $wi) * $wp);
} elseif ($h) {
$hp = $h;
$wp = round(($wi / $he) * $hp);
}
$this->createThumb($wp, $hp);
$this->reDim(0, 0, 0, 0, $wp, $hp, $wi, $he);
if ($opc) return $this->thumb;
else return $this->setImg($ruta);
} else return false;
}
function makeCuadro($ruta, $w, $h, $opc = false) {
if ($this->exist) {
if ($w && $h) {
$wi = $this->width;
$he = $this->height;
if ($wi > $w || $he > $h) {
if ($wi / $w > $he / $h) {
$wp = $w;
$hp = round(($he / $wi) * $wp);
} else {
$hp = $h;
$wp = round(($wi / $he) * $hp);
}
} else {
$wp = $wi;
$hp = $he;
}
$this->createThumb($wp, $hp);
$this->reDim(0, 0, 0, 0, $wp, $hp, $wi, $he);
if ($opc) return $this->thumb;
else return $this->setImg($ruta);
} else return false;
} else return false;
}
function makeCorte($ruta, $w, $h, $opc = false) {
if ($this->exist) {
$wi = $this->width;
$he = $this->height;
if ($w && $h) {
if ($wi / $w < $he / $h) {
$wp = $wi;
$hp = round(($h / $w) * $wp);
} else {
$hp = $he;
$wp = round(($w / $h) * $hp);
}
$lf = round(($wi - $wp) / 2);
$tp = round(($he - $hp) / 2);
$this->createThumb($w, $h);
$this->reDim(0, 0, $lf, $tp, $w, $h, $wp, $hp);
if ($opc) return $this->thumb;
else return $this->setImg($ruta);
} else return false;
} else return false;
}
private function reDim($dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH) {
imagecopyresampled($this->thumb, $this->source, $dstX, $dstY, $srcX, $srcY, $dstW, $dstH, $srcW, $srcH);
}
private function setImg($ruta) {
return imagejpeg($this->thumb, $ruta);
}
}
if (isset($_GET["img"])) {
$img = $_GET["img"];
if (file_exists($img)) {
$ima = new Imagen($img);
$tip = $_GET["tip"];
$w = $_GET["w"];
$h = $_GET["h"];
if ($tip == 0) $thumb = $ima->makeThumb("", $w, $h, true);
if ($tip == 1) $thumb = $ima->makeCuadro("", $w, $h, true);
if ($tip == 2) $thumb = $ima->makeCorte("", $w, $h, true);
if ($thumb) {
header('Content-type: image/jpeg');
imagejpeg($thumb);
} else echo "Error";
}
}
?>