图片转Base64上传，PHP获取转码为图片
先写一下JS函数和调用
<script>
/**
*
* @param id{string}
* @param [width]{number}
* @param [quality]{number}
* @param [type]{string}
* @constructor
* @return [base64格式]{string}
*/
function MinImg(id, width, quality, type) {
var a = this;
a.width = width || 640;
a.quality = quality || 0.8;
a.type = type || "image/jpeg";
var readFile = function () {
var file = this.files[0];
if (!file) {
return
}
if (!/image\/\w+/.test(file.type)) {
a.error('格式错误')
return false
} else {
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
var img = new Image(),
canvas = document.createElement('canvas'),
drawer = canvas.getContext("2d");
img.src = e.target.result;
img.onload = function () {
a.height = a.width * (img.height / img.width);
canvas.width = a.width;
canvas.height = a.height;
drawer.drawImage(img, 0, 0, a.width, a.height);
a.result = canvas.toDataURL(a.type, a.quality);
a.success(a.result, e.target.result)
}
}
}
}
if (typeof(FileReader) === 'undefined') {
a.error('浏览器不支持');
} else {
var input = document.getElementById(id);
input.addEventListener('change', readFile, false);
}
}
// 好啦，告诉你怎么调用的（^_^）
var file_s = new MinImg('id','',0.95)
file_s.success = function (y,n){
var i_id = $("#i_id").val();
$.post(action_img,{id:i_id,file_img:y},function(res){
// res=JSON.encode(res)
if (res.code == 100){
$("#y_img").css('display','none');
var img = document.querySelector('#fileImg')
img.style.display = 'block';
img.src = y;
alert(res.data)
}else{
alert(res.data);
}
},'json')
}
file_s.error = function (err) {
alert(err)
}
</script>嗯，是时候表演真正的技术了（哈哈，小装一下...）
class UploadBase64
{
/**
* $base64 {string} base64格式
* $link {string} 文件存放路径
*
* return $arr{f_name:文件名；fileName:文件路径}
*/
public static function imgsList($base64,$link='./'){
$base64 = explode(',',$base64);
$base64s = $base64[1];
$a = str_replace(';base64','',$base64['0']);
$a = str_replace('data:image/','',$a);
$data = base64_decode($base64s);
$f_name = uniqid() .'.'. $a;
$fileName = $link;
if (!is_dir($fileName) || !is_writable($fileName)){
is_dir($fileName) or mkdir(iconv("UTF-8", "GBK", $fileName),0777,true);
}
$success = file_put_contents($fileName.'/'.$f_name, $data);
if (!$success){
return $success;
}
$arr = ['f_name'=>$f_name,'fileName'=>$fileName.'/'.$f_name];
return $arr;
}
/**
* 裁剪图片为缩略图
* $link 图片存放路径
* $status = 1 按 $wid 的倍数缩放
* $status = 2 按固定像素缩放，$wid为宽，$hei为高
*/
public static function cutImgs($img,$link='./',$status=1,$wid=0,$hei=0){
list($src_w,$src_h)=getimagesize($img);
$a_u = strrchr($img,'.');
$b_h = str_replace('.','',$a_u);
$fileName = '../../upload/web/thumb/'.$link;
if (!is_dir($fileName) || !is_writable($fileName)){
is_dir($fileName) or mkdir(iconv("UTF-8", "GBK", $fileName),0777,true);
}
if ($status == 1){
if($wid!=0&&$hei!=0){
$w = intval($src_w/$wid);
$h = intval($src_h/$wid);
}else{
$w = intval($src_w);
$h = intval($src_h);
}
$source=imagecreatefromjpeg($img);
$target = imagecreatetruecolor($w, $h);
$res=imagecopyresampled($target, $source, 0, 0, 0, 0, $w,$h, $src_w, $src_h);
$postfix = explode(".", $img);
$files = uniqid(). rand(1000, 9999) . '.' . end($postfix);
$tt=Yii::getAlias("@upload").'/web/thumb/'.$link.'/'.$files;
imagejpeg($target, $tt);
imagedestroy($target);
return $files;
}
if ($status == 2){
$target = imagecreatetruecolor($wid, $hei);
if ($b_h == 'png'){
$source=imagecreatefrompng($img);
//设置颜色
$color=imagecolorallocate($target,255,255,255);
imagecolortransparent($target,$color);
imagefill($target,0,0,$color);
}else if($b_h == 'gif'){
$source=imagecreatefromgif($img);
//设置颜色
$color=imagecolorallocate($target,255,255,255);
imagecolortransparent($target,$color);
imagefill($target,0,0,$color);
}else{
$source=imagecreatefromjpeg($img);
}
if ($src_h >= $src_w){
$y = ($src_h-$src_w)/2;
$x = 0;
$src_h = $src_w;
}else{
$x = ($src_w-$src_h)/2;
$y = 0;
$src_w = $src_h;
}
imagecopyresampled($target, $source, 0, 0, $x, $y, $wid,$hei, $src_w, $src_h);
$postfix = explode(".", $img);
$files = uniqid(). rand(1000, 9999) . '.' . end($postfix);
$tt=$fileName.'/'.$files;
imagejpeg($target, $tt);
imagedestroy($target);
return $files;
}
}
}
/**
*
* $base64 {string} base64格式
*
* $path {string} 路径
*/
// 出来吧！皮卡丘！！！
$file_path = UploadBase64::imgsList($base64, $path); // 上传base64的原图
// file_path['fileName']:图片路径+图片名; file_path['f_name']:图片名
$thumb = UploadBase64::cutImgs($file_path['fileName'], $path_s, 2, 450, 450);//上传缩略图，只返回图片名打完收工(～￣▽￣)～
