<?php
$output = [
'META>>DisplayName=Donald Trump',
'META>>EmailAddress=TheDonald@rnc.com',
'META>>EmployeeID=E666420',
'META>>EmployeeType=E',
];

$result = array();

foreach ($output as $value) {
	$meta = explode('>>', $value);
	$property = explode('=', $meta[1]);
	$result['meta'][$property[0]] = $property[1]; 
}

var_dump($result);