WordPress - Send mail wp_mail with attachment

class.ys_mail.php

<?php

class YS_Mail {

    public function YS_Mail() {}

    public function enviar( $e ) {

        $headers  = "From: ".$e['from_name']." <".$e['to_mail']."> \n";
        $headers .= "Reply-To:".$e['from_name']." <".$e['from_mail']."> \n";
        $headers .= "MIME-Version: 1.0 \n";
        $headers .= "Content-type: text/html; charset=utf8 \n";
        $headers .= "Return-Path:".$e['to_mail']." \n";
        $headers .= "To:".$e['to_mail']." \n";

        if ( isset( $e['to_cc'] ) ) {
            $headers .= "Cc:".$e['to_cc']." \n";
        }

        if (isset($e['attachment'])) {

            $allowed =  array('gif','png' ,'jpg', 'doc', 'docx', 'odt', 'pdf', 'zip', 'rar', '7zip');
            $ext = pathinfo($e['attachment']['name'], PATHINFO_EXTENSION);
            if(in_array($ext,$allowed) ) {
                move_uploaded_file( $e['attachment']['tmp_name'], WP_CONTENT_DIR.'/uploads/'.basename( $e['attachment']['name'] ) );
                $anexo = WP_CONTENT_DIR.'/uploads/'.basename( $e['attachment']['name'] );
                $return = wp_mail( $e['to_mail'], $e['subject'], $e['message'], $headers, $anexo );
                unlink($anexo);
            } else {
                $return = false;
            }


        } else {

            $return = wp_mail( $e['to_mail'], $e['subject'], $e['message'], $headers );

        }

        return $return;
    }

}

send-attachment.php

<?php
if (isset($_POST['envia']) && $_POST['envia'] == 'ok') {

	require('../../../../wp-blog-header.php');
	require('class.ys_mail.php');

	$ysmail = new YS_Mail();

	$mensagem = array(
		'from_name' => 'Name',
	    'from_mail' => 'client@email.com.br',
	    'to_name' => 'Name',
	    'to_mail' => 'email@email.com.br',
	    'subject' => 'Subject',
	    'message' => 'Message'
	    'attachment' => $_FILES['file']
	);

	$ysmail->enviar($mensagem);

}

?>

<form method="post" enctype="multipart/form-data">
	<input type="file" name="arquivo">
	<input type="hidden" name="envia" value="ok">
	<button>OK</button>
</form>

send.php

<?php
if (isset($_POST['envia']) && $_POST['envia'] == 'ok') {

	require('../../../../wp-blog-header.php');
	require('class.ys_mail.php');

	$ysmail = new YS_Mail();

	$mensagem = array(
		'from_name' => 'Name',
	    'from_mail' => 'client@email.com.br',
	    'to_name' => 'Name',
	    'to_mail' => 'email@email.com.br',
	    'subject' => 'Subject',
	    'message' => 'Message'
	);

	$ysmail->enviar($mensagem);

}

?>
<form method="post" enctype="multipart/form-data">
	<input type="hidden" name="envia" value="ok">
	<button>OK</button>
</form>

Thank you. This code is working for me.

Thank you, Clean and understandable code works well and correct with routines, unlink uploaded file and so on.