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AjaxUpload.class.php " >AjaxUpload.class.php 
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PHP 实现 Ajax 无刷新图片上传

May 25, 2016 pm 05:06 PM
php

AjaxUpload.class.php 

<?php
/*
 * Ajax 上传类库
 * @author Lee.
 * @date 2013/4/17
 */
class AjaxUpload {
    private $form_name;  //文件form名称
    private $ext_arr;    //允许上传的文件后缀
    private $upload_dir; //上传目录
    private $file_size;  //文件大小

    public function __construct($form_name, $file_size) {
        //初始化属性
        $this->form_name = $form_name;
        $this->ext_arr = array(
            &#39;.jpg&#39;,
            &#39;.png&#39;,
            &#39;.gif&#39;,
            &#39;.jpeg&#39;
        );
        $this->upload_dir = dirname(__FILE__)."/upload";
        $this->file_size = $file_size;
        $this->upload();
    }

    public function __set($key, $val) {
        $this->$key = $val;
    }

    /**
     * Ajax 无刷新上传图片(jpg|gif|png)
     * @param bool $return_arr 是否返回数组,前提是上传成功
     * @return (array)? || output
     */
    public function upload($return_arr=false) {
        if (!is_dir($this->upload_dir)) mkdir($this->upload_dir, 0777); //上传目录不存在则创建
        $file = $_FILES[$this->form_name];
        if ($file[&#39;error&#39;]==1 || $file[&#39;size&#39;]>($this->file_size*1024)) exit(&#39;1&#39;); //上传失败,图片不能大于 $this->file_size k!
        switch ($file[&#39;error&#39;]) {
            case 3:
                exit(&#39;3&#39;); //图片只有部分文件被上传,请重新上传!
                break;
            case 4:
                exit(&#39;4&#39;); //没有任何文件被上传!
                break;
        }
        $ext = $this->getExt($file[&#39;name&#39;]);
        if (!in_array($ext, $this->ext_arr)) exit(&#39;5&#39;); //非图片类型,请上传jpg|png|gif图片!
        $fname = str_replace(&#39;.&#39;, &#39;&#39;, microtime(true)) . rand(1, 9999) . $ext; //图片名称
        $filename = $this->upload_dir . &#39;/&#39; . $fname;
        if (!move_uploaded_file($file[&#39;tmp_name&#39;], $filename)) { //执行上传
            exit(&#39;upload error!&#39;); //上传失败,错误未知
        } else {
            $arr = array(&#39;ok&#39;=>1, &#39;filename&#39;=> &#39;upload/&#39; . $fname, &#39;size&#39;=>$file[&#39;size&#39;]);
            if ($return_arr) return $arr;
            else {
                echo json_encode(array(&#39;ok&#39;=>$arr[&#39;ok&#39;], &#39;filename&#39;=>$arr[&#39;filename&#39;])); exit;
            }
        }
    }

    /**
     * 获取文件后缀名
     * @param string $file_name 文件名称
     * @return string
     */
    private function getExt($file_name) {
        $ext = strtolower(strrchr($file_name, "."));
        return $ext;
    }
}
?>
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