php 图片文件上传

<?php
header("Content-type: text/html; charset=utf-8");
if (isset($_POST['token'])&&$_POST['token']=='upload') {
    // echo "正确提交";
    // print_r($_FILES);
    // die();
    // echo "<br>";
    // $_POST[''];
    //判断是否出错
    if ($_FILES['uploadFile']['error']!=0) {
        echo "<h2>文件上传出错！</h2>";
        die();
    }
    //判断文件是否超出限制
    if ($_FILES['uploadFile']['size']>=2*1024*1024) {
        echo "<h2>文件大于2M!</h2>";
        die();
    }
    //判断文件类型是否图像
    $type = $_FILES['uploadFile']['type'];
    $arr = array('image/jpeg','image/png','image/gif','image/webp'); 
    if (!in_array($type,$arr)) {
        echo '不是图像!';
        die();
    }
    //另存文件到upload文件夹
    $tmp_name = $_FILES['uploadFile']['tmp_name'];
    $ext = pathinfo($_FILES['uploadFile']['name'],PATHINFO_EXTENSION);
    $dst_name = "./upload/".uniqid().'.'.$ext  ;
    // echo $dst_name;
    // die();
    // $dst_name = './upload/'.date('YmdHis').substr($str,stripos($str,'.'),strlen($str)-stripos($str,'.'));
    move_uploaded_file($tmp_name,$dst_name);
    // echo $d;
    print_r($_FILES);
}
else{
    echo "非法提交";
}