PHP怎么上传图片路径,怎么获取图片路径?

得知以下代码中图片保存的的路径是./upload/. 我也知道怎么把图片的保存路径post到数据库,但是我就是不知道PHP的前端怎么获取./upload/下的图片,因为图片的文件名是随机改过的不是固定的,那我前端怎么获取图片名称啊? 还有我前端提交的是哪几张图片,怎么获取? 求PHP大神教教我, 万分感谢,急用!

<?php

// Make sure file is not cached (as it happens for example on iOS devices)
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");

// Support CORS
// header("Access-Control-Allow-Origin: *");
// other CORS headers if any...
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
exit; // finish preflight CORS requests here
}

if ( !empty($_REQUEST[ 'debug' ]) ) {
$random = rand(0, intval($_REQUEST[ 'debug' ]) );
if ( $random === 0 ) {
header("HTTP/1.0 500 Internal Server Error");
exit;
}
}

// header("HTTP/1.0 500 Internal Server Error");
// exit;

// 5 minutes execution time
@set_time_limit(5 * 60);

// Uncomment this one to fake upload time
usleep(5000);

// Settings
// $targetDir = ini_get("upload_tmp_dir") . DIRECTORY_SEPARATOR . "plupload";
$targetDir = 'upload_tmp';
$uploadDir = 'upload';

$cleanupTargetDir = true; // Remove old files
$maxFileAge = 5 * 3600; // Temp file age in seconds

// Create target dir
if (!file_exists($targetDir)) {
@mkdir($targetDir);
}

// Create target dir
if (!file_exists($uploadDir)) {
@mkdir($uploadDir);
}

// Get a file name
if (isset($_REQUEST["name"])) {
$fileName = time().$_REQUEST["name"];
} elseif (!empty($_FILES)) {
$fileName = $_FILES["file"]["name"];
} else {
$fileName = uniqid("file_");
}

$md5File = @file('md5list.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
$md5File = $md5File ? $md5File : array();

if (isset($_REQUEST["md5"]) && array_search($_REQUEST["md5"], $md5File ) !== FALSE ) {
die('{"jsonrpc" : "2.0", "result" : null, "id" : "id", "exist": 1}');
}

$filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;
$uploadPath = $uploadDir . DIRECTORY_SEPARATOR . $fileName;

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