Ищете готовую библиотеку, работаете с ней.
$image = file_get_contents( $link );
file_put_contents( $dir . $filename, $image );
Вот готовая библиотека из opencarta:
<?php
class agooImage
{
private $file;
private $image;
private $info;
public function __construct($file)
{
if (file_exists($file)) {
$this->file = $file;
$info = getimagesize($file);
$this->info = array(
'width' => $info[0],
'height' => $info[1],
'bits' => $info['bits'],
'mime' => $info['mime']
);
$this->image = $this->create($file);
} //file_exists($file)
else {
exit('Error: Could not load image ' . $file . '!');
}
}
private function create($image)
{
$mime = $this->info['mime'];
if ($mime == 'image/gif') {
return imagecreatefromgif($image);
} //$mime == 'image/gif'
elseif ($mime == 'image/png') {
return imagecreatefrompng($image);
} //$mime == 'image/png'
elseif ($mime == 'image/jpeg') {
return imagecreatefromjpeg($image);
} //$mime == 'image/jpeg'
}
public function save($file, $quality = 90)
{
$info = pathinfo($file);
$extension = strtolower($info['extension']);
if (is_resource($this->image)) {
if ($extension == 'jpeg' || $extension == 'jpg') {
imagejpeg($this->image, $file, $quality);
} //$extension == 'jpeg' || $extension == 'jpg'
elseif ($extension == 'png') {
imagepng($this->image, $file);
} //$extension == 'png'
elseif ($extension == 'gif') {
imagegif($this->image, $file);
} //$extension == 'gif'
imagedestroy($this->image);
} //is_resource($this->image)
}
public function resize($width = 0, $height = 0, $default = 'i')
{
if (!$this->info['width'] || !$this->info['height']) {
return;
} //!$this->info['width'] || !$this->info['height']
$xpos = 0;
$ypos = 0;
$scale = 1;
$scale_w = $width / $this->info['width'];
$scale_h = $height / $this->info['height'];
if ($default == 'i') {
$prop_source = $this->info['width'] / $this->info['height'];
$prop_output = $width / $height;
if ($prop_source > 1 && $prop_output > 1) {
$default = 'w';
} //$prop_source > 1 && $prop_output > 1
if ($prop_source > 1 && $prop_output < 1) {
$default = 'h';
} //$prop_source > 1 && $prop_output < 1
if ($prop_source < 1 && $prop_output > 1) {
$default = 'w';
} //$prop_source < 1 && $prop_output > 1
if ($prop_source < 1 && $prop_output < 1) {
$default = 'h';
} //$prop_source < 1 && $prop_output < 1
} //$default == 'i'
if ($default == 'w') {
$scale = $scale_w;
} //$default == 'w'
elseif ($default == 'h') {
$scale = $scale_h;
} //$default == 'h'
else {
$scale = min($scale_w, $scale_h);
}
if ($scale == 1 && $scale_h == $scale_w && $this->info['mime'] != 'image/png') {
return;
} //$scale == 1 && $scale_h == $scale_w && $this->info['mime'] != 'image/png'
$new_width = ceil($this->info['width'] * $scale);
$new_height = ceil($this->info['height'] * $scale);
$xpos = floor(($width - $new_width) / 2);
$ypos = floor(($height - $new_height) / 2);
$image_old = $this->image;
$this->image = imagecreatetruecolor($width, $height);
if (isset($this->info['mime']) && $this->info['mime'] == 'image/png') {
imagealphablending($this->image, false);
imagesavealpha($this->image, true);
$background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
imagecolortransparent($this->image, $background);
} //isset($this->info['mime']) && $this->info['mime'] == 'image/png'
else {
$background = imagecolorallocate($this->image, 255, 255, 255);
}
imagefilledrectangle($this->image, 0, 0, $width, $height, $background);
imagecopyresampled($this->image, $image_old, $xpos - 1, $ypos - 1, 0, 0, $new_width + 3, $new_height + 3, $this->info['width'], $this->info['height']);
imagedestroy($image_old);
$this->info['width'] = $width;
$this->info['height'] = $height;
}
public function watermark($file, $position = 'bottomright')
{
$watermark = $this->create($file);
$watermark_width = imagesx($watermark);
$watermark_height = imagesy($watermark);
switch ($position) {
case 'topleft':
$watermark_pos_x = 0;
$watermark_pos_y = 0;
break;
case 'topright':
$watermark_pos_x = $this->info['width'] - $watermark_width;
$watermark_pos_y = 0;
break;
case 'bottomleft':
$watermark_pos_x = 0;
$watermark_pos_y = $this->info['height'] - $watermark_height;
break;
case 'bottomright':
$watermark_pos_x = $this->info['width'] - $watermark_width;
$watermark_pos_y = $this->info['height'] - $watermark_height;
break;
} //$position
imagecopy($this->image, $watermark, $watermark_pos_x, $watermark_pos_y, 0, 0, 120, 40);
imagedestroy($watermark);
}
public function crop($top_x, $top_y, $bottom_x, $bottom_y)
{
$image_old = $this->image;
$this->image = imagecreatetruecolor($bottom_x - $top_x, $bottom_y - $top_y);
imagecopy($this->image, $image_old, 0, 0, $top_x, $top_y, $this->info['width'], $this->info['height']);
imagedestroy($image_old);
$this->info['width'] = $bottom_x - $top_x;
$this->info['height'] = $bottom_y - $top_y;
}
public function rotate($degree, $color = 'FFFFFF')
{
$rgb = $this->html2rgb($color);
$this->image = imagerotate($this->image, $degree, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
$this->info['width'] = imagesx($this->image);
$this->info['height'] = imagesy($this->image);
}
private function filter($filter)
{
imagefilter($this->image, $filter);
}
private function text($text, $x = 0, $y = 0, $size = 5, $color = '000000')
{
$rgb = $this->html2rgb($color);
imagestring($this->image, $size, $x, $y, $text, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));
}
private function merge($file, $x = 0, $y = 0, $opacity = 100)
{
$merge = $this->create($file);
$merge_width = imagesx($image);
$merge_height = imagesy($image);
imagecopymerge($this->image, $merge, $x, $y, 0, 0, $merge_width, $merge_height, $opacity);
}
private function html2rgb($color)
{
if ($color[0] == '#') {
$color = substr($color, 1);
} //$color[0] == '#'
if (strlen($color) == 6) {
list($r, $g, $b) = array(
$color[0] . $color[1],
$color[2] . $color[3],
$color[4] . $color[5]
);
} //strlen($color) == 6
elseif (strlen($color) == 3) {
list($r, $g, $b) = array(
$color[0] . $color[0],
$color[1] . $color[1],
$color[2] . $color[2]
);
} //strlen($color) == 3
else {
return false;
}
$r = hexdec($r);
$g = hexdec($g);
$b = hexdec($b);
return array(
$r,
$g,
$b
);
}
}
?>