<?php
	$str = "intKey=6, floatKey=12.34, simpleString=simple_value, booleanValue=true, 
	quotedString=\"test value\", singlQuoted='singleQuotedvalue', nullValue=null";

	$result = explode(',', $str);
	$result2 = [];
	foreach ($result as $key) {
		$expl = explode('=', $key);
		$result2[trim($expl[0])] = trim($expl[1]);
	};
	
	print_r($result2);
?>