PHP生成条形图的方法

Obelia ·

更新时间:2024-09-20

· 958 次阅读

本文实例讲述了PHP生成条形图的方法。分享给大家供大家参考。具体实现方法如下：

代码如下:
<?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
   header ("Content-type: image/png");
// spit the image out the other end
imagepng($im);
?>

运行效果如下图所示：

希望本文所述对大家的PHP程序设计有所帮助。

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方法条形图 PHP

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