how can i draw pyramid with php?

how can i draw pyramid with php?

References

Reference NO 1

http://stackoverflow.com/questions/15185973/how-can-i-draw-pyramid-with-php

Reference NO 2

http://stackoverflow.com/questions/15660797/how-to-make-pyramid-programs-in-php

Reference NO 3

http://php-training-free.blogspot.com/2012/04/creating-pyramid-using-php-php-tutorial.html

Reference NO 4

http://blog.decryptweb.com/pyramid-program-php/

Reference NO 5

http://nuclearpyramid.com/great_pyramid.php

Reference NO 6

http://pdepend.org/documentation/handbook/reports/overview-pyramid.html

Reference NO 7

http://www.opengl.org/discussion_boards/showthread.php/123078-best-way-to-draw-a-pyramid

Reference NO 8

https://github.com/leprechau/zap-graph/blob/master/pChart/examples/example.drawStackedBarChart.pyramid.php