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0=>array (
"x" => "102.00001",
"y" => "20.12321"
),
1=>array (
"x" => "300.22",
"y" => "111.22"
),
2=>array (
"x" => "202.1121",
"y" => "30.2122"
)
);
$str = json_encode($coord);
echo $str;
//[{"x":"102.00001","y":"20.12321"},{"x":"300.22","y":"111.22"},{"x":"202.1121","y":"30.2122"}]