上传一个php图片处理类

<?php
class Image {
 ???private $file;
 ???private $image;
 ???private $width;
 ???private $height;
 ???private $bits;
 ???private $mime;

 ???/**
 ????* 图片路径
 ????* Image constructor.
 ????* @param $file
 ????*/
 ???public function __construct($file) {
 ???????if (file_exists($file)) {
 ???????????$this->file = $file;

 ???????????$info = getimagesize($file);

 ???????????$this->width ?= $info[0];
 ???????????$this->height = $info[1];
 ???????????$this->bits = isset($info[‘bits‘]) ? $info[‘bits‘] : ‘‘;
 ???????????$this->mime = isset($info[‘mime‘]) ? $info[‘mime‘] : ‘‘;

 ???????????if ($this->mime == ‘image/gif‘) {
 ???????????????$this->image = imagecreatefromgif($file);
 ???????????} elseif ($this->mime == ‘image/png‘) {
 ???????????????$this->image = imagecreatefrompng($file);
 ???????????} elseif ($this->mime == ‘image/jpeg‘) {
 ???????????????$this->image = imagecreatefromjpeg($file);
 ???????????}
 ???????} else {
 ???????????exit(‘Error: Could not load image ‘ . $file . ‘!‘);
 ???????}
 ???}

 ???public function getFile() {
 ???????return $this->file;
 ???}

 ???public function getImage() {
 ???????return $this->image;
 ???}

 ???public function getWidth() {
 ???????return $this->width;
 ???}

 ???public function getHeight() {
 ???????return $this->height;
 ???}

 ???public function getBits() {
 ???????return $this->bits;
 ???}

 ???public function getMime() {
 ???????return $this->mime;
 ???}

 ???/**
 ????* 保存新图片
 ????* @param $file
 ????* @param int $quality 图片质量 0 -100 imagepng与imagegif函数都没有第三个参数quality。
 ????*/
 ???public function save($file, $quality = 90) {
 ???????$info = pathinfo($file);

 ???????$extension = strtolower($info[‘extension‘]);

 ???????if (is_resource($this->image)) {
 ???????????if ($extension == ‘jpeg‘ || $extension == ‘jpg‘) {
 ???????????????imagejpeg($this->image, $file, $quality);
 ???????????} elseif ($extension == ‘png‘) {
 ???????????????imagepng($this->image, $file);
 ???????????} elseif ($extension == ‘gif‘) {
 ???????????????imagegif($this->image, $file);
 ???????????}
 ???????????imagedestroy($this->image);
 ???????}
 ???}

 ???/**
 ????* 设置图像大小
 ????* @param int $width
 ????* @param int $height
 ????* @param string $default 已那个高度或宽度比例为准
 ????*/
 ???public function resize($width = 0, $height = 0, $default = ‘‘) {
 ???????if (!$this->width || !$this->height) {
 ???????????return;
 ???????}

 ???????$xpos = 0;
 ???????$ypos = 0;
 ???????$scale = 1;

 ???????$scale_w = $width / $this->width;
 ???????$scale_h = $height / $this->height;

 ???????if ($default == ‘w‘) {
 ???????????$scale = $scale_w;
 ???????} elseif ($default == ‘h‘) {
 ???????????$scale = $scale_h;
 ???????} else {
 ???????????$scale = min($scale_w, $scale_h);
 ???????}

 ???????if ($scale == 1 && $scale_h == $scale_w && $this->mime != ‘image/png‘) {
 ???????????return;
 ???????}

 ???????$new_width = (int)($this->width * $scale);
 ???????$new_height = (int)($this->height * $scale);
 ???????$xpos = (int)(($width - $new_width) / 2);
 ???????$ypos = (int)(($height - $new_height) / 2);

 ???????$image_old = $this->image;
 ???????$this->image = imagecreatetruecolor($width, $height);

 ???????if ($this->mime == ‘image/png‘) {
 ???????????imagealphablending($this->image, false);
 ???????????imagesavealpha($this->image, true);
 ???????????$background = imagecolorallocatealpha($this->image, 255, 255, 255, 127);
 ???????????imagecolortransparent($this->image, $background);
 ???????} else {
 ???????????$background = imagecolorallocate($this->image, 255, 255, 255);
 ???????}

 ???????imagefilledrectangle($this->image, 0, 0, $width, $height, $background);

 ???????imagecopyresampled($this->image, $image_old, $xpos, $ypos, 0, 0, $new_width, $new_height, $this->width, $this->height);
 ???????imagedestroy($image_old);

 ???????$this->width = $width;
 ???????$this->height = $height;
 ???}

 ???/**
 ????* 添加图片水印
 ????* @param $watermark 水印图片对象
 ????* @param string $position 水印位置
 ????*/
 ???public function watermark($watermark, $position = ‘bottomright‘) {
 ???????switch($position) {
 ???????????case ‘topleft‘: //左上
 ???????????????$watermark_pos_x = 0;
 ???????????????$watermark_pos_y = 0;
 ???????????????break;
 ???????????case ‘topright‘://右上
 ???????????????$watermark_pos_x = $this->width - $watermark->getWidth();
 ???????????????$watermark_pos_y = 0;
 ???????????????break;
 ???????????case ‘bottomleft‘://左下
 ???????????????$watermark_pos_x = 0;
 ???????????????$watermark_pos_y = $this->height - $watermark->getHeight();
 ???????????????break;
 ???????????case ‘bottomright‘://右下
 ???????????????$watermark_pos_x = $this->width - $watermark->getWidth();
 ???????????????$watermark_pos_y = $this->height - $watermark->getHeight();
 ???????????????break;
 ???????}

 ???????imagecopy($this->image, $watermark->getImage(), $watermark_pos_x, $watermark_pos_y, 0, 0, $watermark->getWidth(), $watermark->getHeight());

 ???????imagedestroy($watermark->getImage());
 ???}

 ???/**
 ????* 裁剪图片有效部分
 ????* @param $top_x
 ????* @param $top_y
 ????* @param $bottom_x
 ????* @param $bottom_y
 ????*/
 ???public function crop($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->width, $this->height);
 ???????imagedestroy($image_old);

 ???????$this->width = $bottom_x - $top_x;
 ???????$this->height = $bottom_y - $top_y;
 ???}

 ???/**
 ????* 旋转图片
 ????* @param $degree
 ????* @param string $color
 ????*/
 ???public function rotate($degree, $color = ‘FFFFFF‘) {
 ???????$rgb = $this->html2rgb($color);

 ???????$this->image = imagerotate($this->image, $degree, imagecolorallocate($this->image, $rgb[0], $rgb[1], $rgb[2]));

 ???????$this->width = imagesx($this->image);
 ???????$this->height = imagesy($this->image);
 ???}

 ???private function filter() {
 ???????$args = func_get_args();

 ???????call_user_func_array(‘imagefilter‘, $args);
 ???}

 ???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]));
 ???}

 ???/**
 ????* 合并水印图片
 ????* @param $merge
 ????* @param int $x
 ????* @param int $y
 ????* @param int $opacity
 ????*/
 ???private function merge($merge, $x = 0, $y = 0, $opacity = 100) {
 ???????imagecopymerge($this->image, $merge->getImage(), $x, $y, 0, 0, $merge->getWidth(), $merge->getHeight(), $opacity);
 ???}

 ???/**
 ????* 16进制颜色转rgb
 ????* @param $color
 ????* @return array|bool
 ????*/
 ???private function html2rgb($color) {
 ???????if ($color[0] == ‘#‘) {
 ???????????$color = substr($color, 1);
 ???????}

 ???????if (strlen($color) == 6) {
 ???????????list($r, $g, $b) = array($color[0] . $color[1], $color[2] . $color[3], $color[4] . $color[5]);
 ???????} elseif (strlen($color) == 3) {
 ???????????list($r, $g, $b) = array($color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2]);
 ???????} else {
 ???????????return false;
 ???????}

 ???????$r = hexdec($r);
 ???????$g = hexdec($g);
 ???????$b = hexdec($b);

 ???????return array($r, $g, $b);
 ???}
}

$imgpath = "old/1.jpg";
$newimgpath = "new/";
$type = 1;
$image = new Image($imgpath);

$width = $image->getWidth();
$height = $image->getHeight();
//$width $height 为新图片的高度和宽度
$image->resize($width, $height);

//输入新图片
$image->save($newimgpath);

上传一个php图片处理类

原文地址：https://www.cnblogs.com/jj0219/p/10436287.html