Invoke $EDITOR from PHP script

EDITOR.php

<?php

$descriptorspec = array(
    0 => fopen('php://stdin','r'),
    1 => fopen('php://stdout','w'),
    2 => array("file", "/tmp/error-output.txt", "a")
);

$tempfile = tempnam('/tmp','testing_');
$cmd = getenv('EDITOR').' '.$tempfile;

$process = proc_open($cmd, $descriptorspec, $pipes);

if (is_resource($process)) {
    $return_value = proc_close($process);
}

echo 'FILE CONTENTS: '.PHP_EOL;
echo file_get_contents($tempfile);