How to draw a graph in PHP

Question

Hey I want to draw a graph Stdent mark distribution  in my site based on PHP  How can I do this

User · Answer

pChart is another great PHP graphing library

User · Answer

Your best bet is to look up php gd2   It s a fairly decent image library that comes with PHP  just disabled in php ini   and not only can you output your finished images in a couple formats  it s got enough functions that you should be able to do up a good graph fairly easily   EDIT  it might help if I gave you a couple useful links   http   www libgd org  - You can get the latest php gd2 herehttp   ca3 php net gd - The php gd manual

User · Answer

There are also several graphing libraries available for PHP to make your life simpler  JPGraph is a good  non-free  one

User · Answer

There are a number of libraries available for generating graphs      Open Flash Cart - Flash based GraPHPite JS charts - Javascript based Libchart   More are listed above and here

User · Answer

By far the easiest solution is to just use the Google Chart API http   code google com apis chart   You can make bar graphs  pie charts  use 3D  and it s as easy as building a url with some parameters  See the simple example below

User · Answer

Have no idea about gd2  but I have done a similar thing with gd and it was not that hard    Go to http   www php net  and search for things like    ImageCreate  imageline  imagestring   It s not as flashy as some of those other solution out there   but since you generate a picture it will work in all browsers   except lynx     -      Johan    Update  I nearly forgot  don t use jpeg for this type of pictures  The jpeg artefacts will be really annoying   png is a better solution

User · Answer

lt     ------- The graph values in the form of associative array  values array       Jan    gt  110       Feb    gt  130       Mar    gt  215       Apr    gt  81       May    gt  310       Jun    gt  110       Jul    gt  190       Aug    gt  175       Sep    gt  390       Oct    gt  286       Nov    gt  150       Dec    gt  196       img width 450   img height 300    margins 20      ---- Find the size of graph by substracting the size of borders  graph width  img width -  margins   2   graph height  img height -  margins   2    img imagecreate  img width  img height      bar width 20   total bars count  values    gap    graph width-  total bars    bar width       total bars  1       -------  Define Colors ----------------  bar color imagecolorallocate  img 0 64 128    background color imagecolorallocate  img 240 240 255    border color imagecolorallocate  img 200 200 200    line color imagecolorallocate  img 220 220 220      ------ Create the border around the graph ------  imagefilledrectangle  img 1 1  img width-2  img height-2  border color   imagefilledrectangle  img  margins  margins  img width-1- margins  img height-1- margins  background color       ------- Max value is required to adjust the scale -------  max value max  values    ratio   graph height  max value      -------- Create scale and draw horizontal lines  --------  horizontal lines 20   horizontal gap  graph height  horizontal lines   for  i 1  i lt   horizontal lines  i          y  img height -  margins -  horizontal gap    i       imageline  img  margins  y  img width- margins  y  line color        v intval  horizontal gap    i   ratio       imagestring  img 0 5  y-5  v  bar color          ----------- Draw the bars here ------ for  i 0  i lt   total bars   i            ------ Extract key and value pair from the current pointer position     list  key  value  each  values         x1   margins    gap    i     gap  bar width         x2   x1    bar width        y1  margins   graph height- intval  value    ratio         y2  img height- margins      imagestring  img 0  x1 3  y1-10  value  bar color  imagestring  img 0  x1 3  img height-15  key  bar color               imagefilledrectangle  img  x1  y1  x2  y2  bar color     header  Content-type image png    imagepng  img     REQUEST  asdfad   234234     gt

User · Answer

You can use google s chart api to generate charts

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