PHP图片拼接类
支持横向和纵向的图片拼接，可以选择将拼接好的图片输出到文件或输出到用户浏览器，并且可以设置允许的最大宽度或最大高度，程序将自动进行缩放。
值得注意的是，程序中包含了一个重写了的file_get_contents函数。phper都知道，普通的file_get_contents是fsockopen功能的简单打包，如果网速很慢或下载这个页面需要很长的时间，会卡在那，持续占用资源，具体分析可以看张宴 - PHP-CGI 进程 CPU 100% 与 file_get_contents 函数的关系。所以此处的file_get_contents重写了一下，避免出现上述情况。
<?php
/**
* Created by IntelliJ IDEA.
* User: chenzhidong
* Date: 13-11-19
* Time: 下午2:55
*/
class ImageCombiner {
const COMBINE_HORIZONTAL = 1;
const COMBINE_VERTICAL = 2;
private $srcs;
private $src_infos;
private $dest_type = IMAGETYPE_JPEG;
private $dest_width = 0;
private $dest_height = 0;
private $combine_mode = self::COMBINE_VERTICAL;
private $canvas;
private $done = false;
public function __construct($srcs, $mode = self::COMBINE_VERTICAL, $dest_width = 0, $dest_height = 0) {
$this->srcs = $srcs;
$this->combine_mode = $mode;
$this->dest_width = $dest_width;
$this->dest_height = $dest_height;
$this->canvas = null;
}
private function sys_get_temp_dir() {
if (function_exists('sys_get_temp_dir')) {
return sys_get_temp_dir();
}
if ($temp = getenv('TMP')) {
return $temp;
}
if ($temp = getenv('TEMP')) {
return $temp;
}
if ($temp = getenv('TMPDIR')) {
return $temp;
}
$temp = tempnam(__FILE__, '');
if (file_exists($temp)) {
unlink($temp);
return dirname($temp);
}
return null;
}
private function file_get_contents($url, $use_include_path = false, $stream_context = null, $curl_timeout = 8) {
if ($stream_context == null && preg_match('/^https?:\/\//', $url))
$stream_context = @stream_context_create(array('http' => array('timeout' => $curl_timeout)));
if (in_array(ini_get('allow_url_fopen'), array('On', 'on', '1')) || !preg_match('/^https?:\/\//', $url))
return @file_get_contents($url, $use_include_path, $stream_context);
elseif (function_exists('curl_init')) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 5);
curl_setopt($curl, CURLOPT_TIMEOUT, $curl_timeout);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
$opts = stream_context_get_options($stream_context);
if (isset($opts['http']['method']) && strtolower($opts['http']['method']) == 'post') {
curl_setopt($curl, CURLOPT_POST, true);
if (isset($opts['http']['content'])) {
parse_str($opts['http']['content'], $datas);
curl_setopt($curl, CURLOPT_POSTFIELDS, $datas);
}
}
$content = curl_exec($curl);
curl_close($curl);
return $content;
}
else
return false;
}
private function saveFile($url, $filepath) {
if ($url && $filepath) {
$file = $this->file_get_contents($url);
$fp = @fopen($filepath, 'w');
if ($fp) {
@fwrite($fp, $file);
@fclose($fp);
return $filepath;
}
}
return false;
}
private function writeImage($type, $resource, $filename) {
switch ($type) {
case IMAGETYPE_GIF:
$success = imagegif($resource, $filename);
break;
case IMAGETYPE_PNG:
$success = imagepng($resource, $filename);
break;
case IMAGETYPE_BMP:
$success = imagewbmp($resource, $filename);
break;
case IMAGETYPE_JPEG:
default:
$success = imagejpeg($resource, $filename, 100);
break;
}
@chmod($filename, 0664);
return $success;
}
private function checkSrcs() {
foreach ($this->srcs as $key => $src) {
$tmp = tempnam($this->sys_get_temp_dir(), 'img_');
if ($this->saveFile($src, $tmp)) {
list($src_width, $src_height, $type) = @getimagesize($tmp);
if ($src_width && $src_height && $type && in_array($type, array(IMAGETYPE_BMP, IMAGETYPE_JPEG, IMAGETYPE_PNG, IMAGETYPE_GIF))) {
$image = array('width' => $src_width, 'height' => $src_height, 'type' => $type, 'image' => $tmp);
$this->src_infos[$key] = $image;
}
else {
unset($this->srcs[$key]);
}
}
else {
unset($this->srcs[$key]);
}
}
}
private function checkSizes() {
switch ($this->combine_mode) {
case self::COMBINE_VERTICAL:
if (!$this->dest_width) {
foreach ($this->src_infos as $src) {
$this->dest_width = max($this->dest_width, $src['width']);
}
}
foreach ($this->src_infos as $src) {
$this->dest_height += round($this->dest_width * $src['height'] / $src['width']);
}
break;
case self::COMBINE_HORIZONTAL:
if (!$this->dest_height) {
foreach ($this->src_infos as $src) {
$this->dest_height = max($this->dest_height, $src['height']);
}
}
foreach ($this->src_infos as $src) {
$this->dest_width += round($this->dest_height * $src['width'] / $src['height']);
}
break;
}
}
private function createTransImage($width, $height) {
$image = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $white);
imagecolortransparent($image, $white);
return $image;
}
private function combineVertical() {
$destX = 0;
$destY = 0;
foreach ($this->src_infos as $key => $src) {
if ($this->dest_width != $src['width']) {
$dest_height = round($src['height'] * ($this->dest_width / $src['width']));
}
else
$dest_height = $src['height'];
switch ($src['type']) {
case IMAGETYPE_PNG:
$image = @imagecreatefrompng($src['image']);
break;
case IMAGETYPE_BMP:
$image = @imagecreatefromwbmp($src['image']);
break;
case IMAGETYPE_GIF:
$image = @imagecreatefromgif($src['image']);
break;
case IMAGETYPE_JPEG:
default:
$image = @imagecreatefromjpeg($src['image']);
break;
}
if ($image && !imagecopyresampled($this->canvas, $image, $destX, $destY, 0, 0, $this->dest_width, $dest_height, $src['width'], $src['height']))
return false;
if ($image)
imagedestroy($image);
unlink($src['image']);
$destY += $dest_height;
}
return $this->canvas;
}
private function combineHorizontal() {
$destX = 0;
$destY = 0;
foreach ($this->src_infos as $key => $src) {
if ($this->dest_height != $src['height']) {
$dest_width = round($src['width'] * ($this->dest_height / $src['height']));
}
else
$dest_width = $src['width'];
switch ($src['type']) {
case IMAGETYPE_PNG:
$image = @imagecreatefrompng($src['image']);
break;
case IMAGETYPE_BMP:
$image = @imagecreatefromwbmp($src['image']);
break;
case IMAGETYPE_GIF:
$image = @imagecreatefromgif($src['image']);
break;
case IMAGETYPE_JPEG:
default:
$image = @imagecreatefromjpeg($src['image']);
break;
}
if ($image && !imagecopyresampled($this->canvas, $image, $destX, $destY, 0, 0, $dest_width, $this->dest_height, $src['width'], $src['height']))
return false;
if ($image)
imagedestroy($image);
unlink($src['image']);
$destX += $dest_width;
}
return true;
}
public function setDestType($type) {
$this->dest_type = $type;
}
public function getDestType() {
return $this->dest_type;
}
private function combine() {
if (!$this->done) {
if (PHP_VERSION_ID < 50300)
clearstatcache();
$this->checkSrcs();
$this->checkSizes();
if (!empty($this->src_infos)) {
$this->canvas = $this->createTransImage($this->dest_width, $this->dest_height);
switch ($this->combine_mode) {
case self::COMBINE_HORIZONTAL:
$this->done = $this->combineHorizontal();
break;
case self::COMBINE_VERTICAL:
$this->done = $this->combineVertical();
break;
}
}
}
return $this->done;
}
public function getCombination() {
$image = $this->combine();
if ($image)
return $this->canvas;
return false;
}
public function showCombination() {
$image = $this->combine();
if ($image) {
switch ($this->getDestType()) {
case IMAGETYPE_GIF:
header("Content-type: image/gif");
imagegif($this->canvas);
break;
case IMAGETYPE_BMP:
header("Content-type: image/bmp");
imagewbmp($this->canvas);
break;
case IMAGETYPE_JPEG:
header("Content-type: image/jpeg");
imagejpeg($this->canvas);
break;
case IMAGETYPE_PNG:
header("Content-type: image/png");
imagepng($this->canvas);
break;
}
}
imagedestroy($this->canvas);
}
public function saveCombination($dest_file) {
$image = $this->combine();
if ($image) {
if ($this->writeImage($this->dest_type, $this->canvas, $dest_file)) {
imagedestroy($this->canvas);
return true;
}
}
return false;
}
}
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