php上传图片客户端和服务器端实现方法

2024-05-04 23:33:37

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这篇文章主要介绍了php上传图片客户端和服务器端实现方法,涉及php操作文件的技巧,涉及图片后缀验证、文件重命名等常用方法,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php上传图片客户端和服务器端实现方法。分享给大家供大家参考。具体如下：

前台表单代码

<form name="form1" method="post" action="admin_upfile.php" enctype="multipart/form-data">

<input type="file" name="pic">

<input type="submit" name="Submit" value="开始上传" class="button">

</form>

后端php代码

<?php

//这里上传 $upsize判断上传文件的大小

$uppath = "/attached/"; //文件上传路径

//转换根目录的路径

if (strpos($uppath, "/") == 0)

{

$i = 0;

$thpath = $_SERVER["SCRIPT_NAME"];

$thpath = substr($thpath, 1, strlen($thpath));

while (strripos($thpath, "/") !== false)

{

$thpath = substr($thpath, strpos($thpath, "/") + 1, strlen($thpath));

$i = ++$i;

}

$pp = "";

for ($j = 0; $j < $i; ++$j)

{

$pp .= "../";

}

$uppaths = $pp . substr($uppath, 1, strlen($thpath));

}

$filename = date("y-m-d");

if (is_dir($uppaths . $filename) != TRUE)

mkdir($uppaths . $filename, 0777);

$f = $_FILES['pic'];

if ($f["type"] != "image/gif" && $f["type"] != "image/pjpeg" && $f["type"] != "image/jpeg" && $f["type"] != "image/x-png")

{

echo "<script>alert('只能上传图片格式的文件');window.close()</script>";

return false;

}

//获得文件扩展名

$temp_arr = explode(".", $f["name"]);

$file_ext = array_pop($temp_arr);

$file_ext = trim($file_ext);

$file_ext = strtolower($file_ext);

//新文件名

$new_file_name = md5(date("YmdHis")) . '.' . $file_ext;

echo $dest = $uppaths . $filename . "/" . date("ymdhis") . "_" .

$new_file_name; //设置文件名为日期加上文件名避免重复上传目录

echo $dest1 = $uppath . $filename . "/" . date("ymdhis") . "_" .

$new_file_name; //设置文件名为日期加上文件名避免重复

$r = move_uploaded_file($f['tmp_name'], $dest);

?>