PHP error check before trying to send emails

Dealing with a live site and don't want to blow up the page - will this cause any problems anyone can see

			// Send emails to individuals
		if (isset($_POST['id-01'])) {
			$to = 'email@somewhere.com';
		}
		elseif (isset($_POST['id-02'])) {
			$to = 'email@somewhere.com';
		}
		elseif (isset($_POST['id-03'])) {
			$to = 'email@somewhere.com';
		}
		elseif (isset($_POST['id-04'])) {
			$to = 'email@somewhere.com';
			
		$send_data = array(
			'to' => $contact_form['Mail_To'] ? $contact_form['Mail_To'] : $this->default_contact_email,
			'from' => $contact_form['Mail_From'] ? $contact_form['Mail_From'] : $this->default_email_from_address,
			'subject' => "{$contact_form['Subject']} from $this->End_User_URL",
			'body' => $contact_form['Body']
			);
		}

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