how to parseFloat this? - php

Question

i have this code :
$wage = array();
foreach ($result3 as $row3) {
$wage[] = '[' . floatval($row3['age']) . ',' . floatval($row3['point']) .']';
}
if ($userid == 0 ) {
$age= "";
} else {
$age = implode(',', $wage).",";
}
echo json_encode("var2"=>$myvar ,"var3"=>$age)); // i didnt write var2 because is same as var3
the above will outputs something like [4,2.3][5,6],[1.7,5],
and in javascript im receiving this value outputed above via ajax which has name var3.
dataType: 'json' ,
success: function(response){
var age = response['var3'] ;
.....
so the question is how can i parseFloat this variable age ?
EDIT .
if i alert the json like that
alert (response);
i get [object Object] // make attention to small o and big O
EDIT2 .
used consol log
and i get this
{"var2":"[2,5],[3.5,5],[6.5,6.5],[8,7],","var3":"[2,46],[3.5,61],[6.5,70],[8,71],","var4":"[2,32],[3.5,41],[6.5,42],[8,43],","var5":"[46,5],[61,5],[70,6.5],[71,7],"}
this returned values i want to parseFloat them as you see they are like strings between two quotes

Answer 1

This is incorrect:
$wage[] = '[' . floatval($row3['age']) . ',' . floatval($row3['point']) .']';
You're building a string, which coincidentally happens to LOOK like a javascript array definition, but it's still just a string. When this gets json_encoded, it'll come out as
"[...,...]"
^-- ^-- string
You need to build NATIVE data structures at all stages while in PHP, e.g.
$wage[] = array(floatval($row3['age']), floatval($row3['point']));
and not this mish-mash of native AND "json-like" strings. json_encode() converts NATIVE datatypes of the equivalent Javascript types. Since your own floatval business is producing a string, you'll get a json-encoded string, not an array.

Answer 2

You are getting this all wrong. You do not need to do this;
foreach ($result3 as $row3) {
$wage[] = '[' . floatval($row3['age']) . ',' . floatval($row3['point']) .']';
}
Perhaps what you want is;
foreach ($result3 as $i => $row3) {
$newRow = $row3;
$newRow['age'] = intval($row3['age']);
$newRow['point'] = floatval($row3['point']);
$result3[$i] = $newRow;
}
And then do this;
// Create JSON data, assuming that $result3 is an array
$jsonData = json_encode($result3);
// This will give you a JSON string, output this and finish to ensure it IS the only thing output
echo $jsonData;
die;
Now in your javascript, open the development console in what ever browser your using and use the following code in javascript
console.log(response)
This will output the whole response variable to the console and enable you to debug how to get specific data out of the response var.
Hope that helps.