PHP文件上载无法移动文件

我自己创建了这个脚本，一旦我得到它来实际上传文件，就会考虑安全性，但目前我收到了以下错误：

警告：move_uploaded_file（public_html/uploades/rikkles/1/apt&c-application-
form-2005.pdf）[function.move上传文件]：无法打开流：没有此类文件或目录位于/websites/123reg/LinuxPackage22/sf/pa/ys/sfpayslips.info/public_html/login/第16行上传.php

错误：

警告：move_uploaded_file（）[function.move uploaded file]：无法移动'/tmp/phpz4zlrR'到'public_html/uploads/rikles/1/apt&c-application-form-2005.pdf'/websites/123reg/LinuxPackage22/sf/pa/ys/sfpayslips.info/public_html/login/upload.php在线16

这是代码：

if($_POST["upload"]){
$target_path = 'public_html/uploads/' . strtolower(str_replace(' ','',$_POST["username"])) . '/' . $_POST["month"] . '/' . basename($_FILES['uploadedfile']['name']);
$filename = basename($_FILES['uploadedfile']['name']);
$ext = substr($filename, strrpos($filename, '.') + 1);
if (($ext == "pdf") && ($_FILES["uploadedfile"]["type"] == "application/pdf") && ($_FILES["uploadedfile"]["size"] < 550000)) {
    if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)){
        echo "<div class='success'>The file " . "<span class='filename'>" . basename( $_FILES['uploadedfile']['name']) . "</span>" . " has been uploaded</div>";
    } else {
        echo "<div class='error'>There was an error uploading the file, please try again!</div>";
    }
} else {
    echo "<div class='error'>You can only upload PDF file types</div>";
}
print $target_path;
}