PHP bar chart implementation code

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Copy codeThe Code is as follows:
<? Php
Function createImage ($ data, $ twidth, $ tspace, $ height ){
Header ("Content-Type: image/jpeg ");
$ Dataname = array ();
$ Datavalue = array (); // values in data
$ I = 0;
$ J = 0;
$ K = 0;
$ Num = sizeof ($ data );

Foreach ($ data as $ key => $ val ){
$ Dataname [] = $ key;
$ Datavalue [] = $ val;
}

$ Width = $ num * ($ twidth + $ tspace) + 20; // obtain the image width.
$ Im = imagecreate ($ width, $ height); // create an image

$ Bgcolor = imagecolorallocate ($ im, 255,255,255); // background color
$ Jcolor = imagecolorallocate ($ im, 255,255, 0); // specifies the background color of the rectangle.
$ Acolor = imagecolorallocate ($ im, 0); // line color

Imageline ($ im, 25, $ height-20, $ width-5, $ height-20, $ acolor); // X axis
Imageline ($ im, 25, $ height-20, 25, 2, $ acolor); // y axis
While ($ I <$ num ){
Imagefilledrectangle ($ im, $ I * ($ tspace + $ twidth) + 40, $ height-$ datavalue [$ I]-20, $ I * ($ twidth + $ tspace) + $ tspace + 40, $ height-20, $ jcolor); // draw a rectangle
Imagestring ($ im, 3, $ I * ($ tspace + $ twidth) + 40 + $ twidth/2, $ height-$ datavalue [$ I]-35, $ datavalue [$ I], $ acolor); // write the value on the column
Imagestring ($ im, 3, $ I * ($ tspace + $ twidth) + 40 + $ twidth/2, $ height-15, $ dataname [$ I], $ acolor); // write the value below the column
$ I ++;

}
While ($ j <400/10 ){
Imageline ($ im, 25, ($ height-20)-$ j * 8, 28, ($ height-20)-$ j * 8, $ acolor); // draw a scale
Imagestring ($ im, 2, 5, ($ height-30)-$ j * 8, $ j * 10, $ acolor); // mark the scale value
$ J = $ j + 10;
}
Imagejpeg ($ im );
}
$ Data = array ("1" => 25, "2" => 30, "3" => 21 );
CreateImage ($ data, 300 );

?>