Control de sesion

[adrirs11]

Lo hago de esta manera (el echo lo he modificado para que devuelva ... 2014,02,17):

series: [{
name: 'EMF',
type: 'line',
zIndex: 10,
data: [[Date.UTC(<?php echo $_SESSION["val1"]["0"];?>), 0],
[Date.UTC(2013, 10, 10), 0.6 ],
[Date.UTC(2013, 10, 18), 0.7 ],
[Date.UTC(2013, 11, 2), 0.8 ],
[Date.UTC(2013, 11, 9), 0.6 ],
[Date.UTC(2013, 11, 16), 0.6 ],
[Date.UTC(2013, 11, 28), 0.67],
[Date.UTC(2014, 0, 1), 0.81],
[Date.UTC(2014, 0, 8), 0.78],
[Date.UTC(2014, 0, 12), 0.98],
[Date.UTC(2014, 0, 27), 1.84],
[Date.UTC(2014, 1, 10), 1.80],
[Date.UTC(2014, 1, 18), 1.80],
[Date.UTC(2014, 1, 24), 1.92],
[Date.UTC(2014, 2, 4), 2.49],
[Date.UTC(2014, 2, 11), 2.79],
[Date.UTC(2014, 2, 15), 2.73],
[Date.UTC(2014, 2, 25), 2.61],
[Date.UTC(2014, 3, 2), 2.76],
[Date.UTC(2014, 3, 6), 2.82],
[Date.UTC(2014, 3, 13), 2.8 ],
[Date.UTC(2014, 4, 3), 2.1 ],
[Date.UTC(2014, 4, 26), 1.1 ],
[Date.UTC(2014, 5, 9), 0.25],
[Date.UTC(2014, 5, 12), 0 ]],
marker: {
lineColor: '#d1cf3c',
lineWidth: 1,
states: {
hover: {
fillColor: '#d1cf3c',
lineColor: '#006699',
lineWidth: 2
}
}},

La variable sesion haciendo un echo fuera del highchart:

<?php echo json_encode($_SESSION["val1"]["0"]); ?>

Muestra la fecha correctamente, pero dentro del highchart no muestra nada o lo hace mal..