Seems like a convoluted way to do whatever this is, but yeah, here's a simple way to generate that - all untested and may contain stupid bugs because I've got a headache, but here you go...

First build the array of weeks:

    $marking = [ strtotime('sunday') * 1000 ];
    for ( var $i = 1 ; $i <= 52 ; $i++ )
        $marking[i] = strtotime((-1*$i).' week sunday') * 1000;

Then re-map each one into the desired format (use a better function name):

    function convert_to_my_format( $CurMarking )
    {
        return "{ xaxis: { from: ".($CurMarking+10000000).", to: ".($CurMarking-96400000)." }, color: \"#F3F3ED\" }";
    }

    $markings = array_map( "convert_to_my_format" , $marking );

Finally convert that array into a comma-delimited string:

    $markings = implode( "," , $markings );

   for ( $i = 1 ; $i <= 52 ; $i++ )
        $marking[i] = strtotime((-1*$i).' week sunday') * 1000;

   function convert_to_markings( $CurMarking )
    {
        return "{ xaxis: { from: ".($CurMarking).", to: ".($CurMarking-96400000)." }, color: \"#F3F3ED\" }";
    }

    $markings = array_map( "convert_to_markings" , $marking );

    $markings = implode( "," , $markings );

{ xaxis: { from: 1425168000000, to: 1425071600000 }, color: "#F3F3ED" }

...of an idiot who doesn't know what things are. :S

Hmm, bit harsh? Maybe just a dunce. (hug)

jQuery neither prefixes variable names not puts dollars in front of selectors. It aliases itself as $, and as a function it can have arguments, the first of which can be a selector, though it also can be other things, and also has various methods attached to the function's object itself.

Which is not to say it isn't a bit dumb, but it is at least more convenient than typing case sensitive jQuery, though even that isn't as $durbrained $as $bloody $_PHP.