PHP implements client-side and server-side methods for uploading images

This article mainly introduces the client and server-side implementation methods of uploading images in PHP, involving the skills of operating files in PHP, and common methods such as image suffix verification and file renaming. It has certain reference value and friends in need can refer to it. Next

The example in this article describes the client and server-side implementation methods of uploading pictures in PHP. The details are as follows:

Front-end form code

<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>

Back-end php code

<?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 = $_FILES[&#39;pic&#39;];
if ($f["type"] != "image/gif" && $f["type"] != "image/pjpeg" && $f["type"] != "image/jpeg" && $f["type"] != "image/x-png")
{
  echo "<script>alert(&#39;只能上传图片格式的文件&#39;);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")) . &#39;.&#39; . $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[&#39;tmp_name&#39;], $dest);
?>

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