Need to overlap bar chart
Define the barPadding(space between bars at the same x position, or same category) a negative balue will overlap bars.
Here's an example with "barPadding".
http://phpchart.org/examples/set-php-chart-default-options/
Define the barPadding(space between bars at the same x position, or same category) a negative balue will overlap bars.
Here's an example with "barPadding".
http://phpchart.org/examples/set-php-chart-default-options/