Simple example of uploading files in php

This article introduces a simple example of file upload in PHP. Friends in need can refer to it.

Share a piece of PHP code to implement file upload. Mainly learn how to receive uploaded data in PHP, including the usage of enctype="multipart/form-data", move_uploaded_file, etc.

1, Simple example of uploading files in php

<?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. Code to detect whether the uploaded file exists

<?php
/**
* 通过$_FILES['file']['tmp_name']检查上传文件存在与否
* by bbs.it-home.org
*/
if (!is_uploaded_file($_FILES['upload_file']['tmp_name'])) {
    $error = "You must upload a file!";
    unlink($_FILES['upload_file']['tmp_name']);
}
else {
   
}?>