get_class_methods is not implemented

[dave-irvine]

var php = require('uniter').createEngine('PHP');
php.getStdout().on('data', function (text) { console.log(text); });
php.getStderr().on('data', function (text) { console.error(text); });

php.execute('<?php print get_class_methods();');

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PHP Fatal error: Call to undefined function get_class_methods()