分享一段php实现文件上传的代码，主要学习下在php中接收上传数据的方法，包括enctype="multipart/form-data"、move_uploaded_file等的用法。
1，php上传文件的简单示例
<?php if ($_SERVER['REQUEST_METHOD'] == 'GET') { ?>
<form method="post" action="<?php echo $_SERVER['SCRIPT_NAME'] ?>" enctype="multipart/form-data">
<input type="file" name="document"/>
<input type="submit" value="上传文件"/>
</form>
<?php } else {
if (isset($_FILES['document']) &&
($_FILES['document']['error'] == UPLOAD_ERR_OK)) {
$newPath = '/tmp/' . basename($_FILES['document']['name']);
if (move_uploaded_file($_FILES['document']['tmp_name'], $newPath)) {
print "File saved in $newPath";
} else {
print "Couldn't move file to $newPath";
}
} else {
print "No valid file uploaded.";
}
}
?>
2，检测上传文件是否存在的代码
<?php
/**
* 通过$_FILES['file']['tmp_name']检查上传文件存在与否
* by www.jb200.com
*/
if (!is_uploaded_file($_FILES['upload_file']['tmp_name'])) {
$error = "You must upload a file!";
unlink($_FILES['upload_file']['tmp_name']);
}
else {
}?>