PHP文件上传到FTP（此处使用Uploadify作为FTP）——无法执行上传

这个问题就是上传的文件不能正常地传到FTP服务器上。

首先要确保FTP服务器的设置是正确的。然后检查PHP代码是否正确。

以下是一个解决方法的示例代码：

<?php
if(isset($_FILES["file"]["type"])) {
    $validextensions = array("jpeg", "jpg", "png", "gif");
    $temporary = explode(".", $_FILES["file"]["name"]);
    $file_extension = end($temporary);
    if ((($_FILES["file"]["type"] == "image/png")
    || ($_FILES["file"]["type"] == "image/jpg")
    || ($_FILES["file"]["type"] == "image/jpeg")
    || ($_FILES["file"]["type"] == "image/gif")
    ) && ($_FILES["file"]["size"] < 100000)//Approx. 100kb files can be uploaded.
    && in_array($file_extension, $validextensions)) {
        if ($_FILES["file"]["error"] > 0) {
            echo "Return Code: " . $_FILES["file"]["error"] . "<br/><br/>";
        } else {
            $ftp_server = "ftp.example.com";
            $ftp_user_name = "your_username";
            $ftp_user_pass = "your_password";
            $destination_file = "/public_html/uploads/".$_FILES["file"]["name"];
            // set up basic connection
            $conn_id = ftp_connect($ftp_server); 
            // login with username and password
            $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
            // upload the file
            if(ftp_put($conn_id, $destination_file, $_FILES["file"]["tmp_name"], FTP_BINARY)) {
                echo "File uploaded successfully. ";
            } else {
                echo "There was a problem while uploading your file. Please try again. ";
            }
            // close the connect and file handler
            ftp_close($conn_id);
        }
    } else {
        echo "Invalid file size or type. Please try again. ";
    }
}
?>

上面的代码进行了以下操作：

1.使用Uploadify上传文件。 2.检查上传文件的大小和类型