PHP搜索替换有趣的任务

from:
$string = \'
h= 1.00                h= 2.00  h= 3.50
W= 1.50                w= 3.00  w= 4.50
st=5000                st=6000  st=7000
\';

to:
$string = \'
A=1.00, B=2.00, C=3.50
A=1.50, B=3.00, C=4.50
A=5000, B=6000, C=7000
\';

preg_match_all(\'/\\w+=\\s*([\\d.]+).+\\w+=\\s*([\\d.]+).+\\w+=\\s*([\\d.]+)/\',
     $input, $values, PREG_SET_ORDER);
print_r($values);

[0] => Array
    (
        [0] => h= 1.00                h= 2.00  h= 3.50
        [1] => 1.00
        [2] => 2.00
        [3] => 3.50
    )

foreach ($values as $row) {
    array_shift($row);
    $output .= \"A=$row[0], B=$row[1], C=$row[2]\\n\";
}