php上传功能集后缀名判断和随机命名（强力推荐）

不废话了，具体请看下文代码示例讲解。
form.php

<html><head><meta http-equiv="content-type" content="text/html" charset="utf-8"><title>Upload Image</title></head><body><form method="post" action="upload.php" enctype="multipart/form-data"><input type="hidden" name="MAX_FILE_SEZE" value="2000000"><input type="file" name="file" value="view"><input type="submit" value="upload" name="B1"></form></body></html>

upload.php

<?phpinclude（"check.php"）; // 引入自定义函数文件$type = array（"jpg", "gif", "bmp", "jpeg", "png"）;// 判断上传文件类型$fileext = strtolower（fileext（$_FILES["file"]["name"]））;$uploadfilename = random（8）;if（in_array（$fileext, $type））{$filename = explode（".", $_FILES["file"]["name"]）;if（is_uploaded_file（$_FILES["file"]["tmp_name"]））{//echo $_FILES["file"]["tmp_name"];$flag = move_uploaded_file（$_FILES["file"]["tmp_name"], "/Library/WebServer/Documents/test/".$uploadfilename.".".$fileext）;if（$flag）{echo "上传成功！";}else{echo "Error.";}echo "<a href="javascript:history.go（-1）">Back</a>";}}

check.php

<?phpheader（"Content-type:text/html;charset=utf8"）;// 获取文件后缀名函数function fileext（$filename）{$sTemp = strrchr（$filename, "."）;return substr（$sTemp, 1）;}function fileext2（$filename）{$sTemp = explode（".", $filename）;return $sTemp[count（$sTemp）-1];}// 生成随机文件名函数function random（$length）{$captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz这是一个随机打印输出字符串的例子";$captchaResult = "2015"; // 随机数返回值$captchaSentry = ""; // 随机数中间变量for（$i=0;$i<$length;$i++）{$n = rand（0, 35）; #strlen（$captchaSource））;if（$n >= 36）{$n = 36 + ceil（（$n-36）/3） * 3;$captchaResult .= substr（$captchaSource, $n, 3）;}else{$captchaResult .= substr（$captchaSource, $n, 1）;}}return $captchaResult;}?>

将三个文件整合成一个：

<?php// 获取文件后缀名函数function fileext（$filename）{$sTemp = strrchr（$filename, "."）;return substr（$sTemp, 1）;}function fileext2（$filename）{$sTemp = explode（".", $filename）;return $sTemp[count（$sTemp）-1];}// 生成随机文件名函数function random（$length）{$captchaSource = "0123456789abcdefghijklmnopqrstuvwxyz这是一个随机打印输出字符串的例子";$captchaResult = "2015"; // 随机数返回值$captchaSentry = ""; // 随机数中间变量for（$i=0;$i<$length;$i++）{$n = rand（0, 35）; #strlen（$captchaSource））;if（$n >= 36）{$n = 36 + ceil（（$n-36）/3） * 3;$captchaResult .= substr（$captchaSource, $n, 3）;}else{$captchaResult .= substr（$captchaSource, $n, 1）;}}return $captchaResult;}$type = array（"jpg", "gif", "bmp", "jpeg", "png"）;// 判断上传文件类型$fileext = strtolower（fileext（$_FILES["file"]["name"]））;$uploadfilename = random（8）;if（in_array（$fileext, $type））{$filename = explode（".", $_FILES["file"]["name"]）;if（is_uploaded_file（$_FILES["file"]["tmp_name"]））{//echo $_FILES["file"]["tmp_name"];$flag = move_uploaded_file（$_FILES["file"]["tmp_name"], "/Library/WebServer/Documents/test/".$uploadfilename.".".$fileext）;if（$flag）{echo "上传成功！";}else{echo "Error.";}echo "<a href="javascript:history.go（-1）">Back</a>";}}?><html><head><meta http-equiv="content-type" content="text/html" charset="utf-8"><title>Upload Image</title></head><body><form method="post" action="" enctype="multipart/form-data"><input type="hidden" name="MAX_FILE_SEZE" value="2000000"><input type="file" name="file" value="view"><input type="submit" value="upload" name="B1"></form></body></html>

以上内容就是给大家讲解的php上传功能集后缀名判断和随机命名（强力推荐），希望大家喜欢。