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。
