<?php
// create an array of values for the chart. These values
// could come from anywhere, POST, GET, database etc.
$values = array (23,32,35,57,12,3,36,54,32,15,43,24,30);
// now we get the number of values in the array. this will
// tell us how many columns to plot
$columns = count ( $values );
// set the height and width of the graph image
$width = 300;
$height = 200;
// Set the amount of space between each column
$padding = 5;
// Get the width of 1 column
$column_width = $width / $columns ;
// set the graph color variables
$im = imagecreate( $width , $height );
$gray = imagecolorallocate ( $im ,0xcc,0xcc,0xcc);
$gray_lite = imagecolorallocate ( $im ,0xee,0xee,0xee);
$gray_dark = imagecolorallocate ( $im ,0x7f,0x7f,0x7f);
$white = imagecolorallocate ( $im ,0xff,0xff,0xff);
// set the background color of the graph
imagefilledrectangle( $im ,0,0, $width , $height , $white );
// Calculate the maximum value we are going to plot
$max_value = max( $values );
// loop over the array of columns
for ( $i =0; $i < $columns ; $i ++)
{
// set the column hieght for each value
$column_height = ( $height / 100) * (( $values [ $i ] / $max_value )
*100);
// now the coords
$x1 = $i * $column_width ;
$y1 = $height - $column_height ;
$x2 = (( $i +1)* $column_width )- $padding ;
$y2 = $height ;
// write the columns over the background
imagefilledrectangle( $im , $x1 , $y1 , $x2 , $y2 , $gray );
// This gives the columns a little 3d effect
imageline( $im , $x1 , $y1 , $x1 , $y2 , $gray_lite );
imageline( $im , $x1 , $y2 , $x2 , $y2 , $gray_lite );
imageline( $im , $x2 , $y1 , $x2 , $y2 , $gray_dark );
}
// set the correct png headers
//开源代码phpfensi.com
header ( "Content-type: image/png" );
// spit the image out the other end
imagepng( $im );
?>