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一个简单的PHP文件上传示例程序

May 25, 2016 pm 04:47 PM
function

本文章来给各位初学者来介绍一个简单的PHP文件上传示例程序代码,有需要学习的朋友可进入参考参考.

实例代码如下:

<?php
// 定义提示函数
function alert($msg) {
    return &#39;<script type="text/javascript">alert("&#39; . $msg . &#39;");window.history.back(-1);</script>&#39;;
}
// 定义允许的文件类型
$allowType = array(
    &#39;image/jpeg&#39;,
    &#39;image/gif&#39;,
    &#39;image/jpg&#39;
);
// 定义路径,可以是绝对路径,或者相对路径都可以
$filePath = &#39;./uploadFileDir/&#39;;
// 接收表单信息 其中里边写的 file 值是 静态页form表单里的name值
$file = $_FILES[&#39;file&#39;];
// 第一步,判断上传的文件是否有错误
if ($file[&#39;error&#39;] !== 0) {
    exit(alert(&#39;文件上传错误&#39;));
}
// 第二步,判断文件大小,这里的102400是字节,换算为kb就是100kb
if ($file[&#39;size&#39;] > 102400) {
    exit(alert(&#39;文件过大&#39;));
}
// 第三步,判断文件类型
if (!in_array(mime_content_type($file[&#39;tmp_name&#39;]) , $allowType)) {
    exit(alert(&#39;文件类型错误&#39;));
}
// 第四步,判断路径是否存在,如果不存在则创建
if (!file_exists($filePath) && !mkdir($filePath, 0777, true)) {
    exit(alert(&#39;创建目录错误&#39;));
}
// 第五步,定义上传后的名字及路径
$filename = time() . &#39;_&#39; . $file[&#39;name&#39;];
// 第六步,复制文件
if (!copy($file[&#39;tmp_name&#39;], $filePath . $filename)) {
    exit(alert(&#39;上传文件出错,请稍候重试&#39;));
}
// 第七步,删除临时文件
unlink($file[&#39;tmp_name&#39;]);
// 提示上传成功
echo alert(&#39;恭喜,上传文件[&#39; . $filename . &#39;]成功!&#39;);
?>
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