Bar chart PHP bar chart implementation code

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Copy code The code is as follows:

function createImage($data,$twidth,$tspace,$height){
header("Content-Type:image /jpeg");
$dataname = array();
$datavalue = array();//The value 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;//Get the width of the image
$im = imagecreate($width,$height);//Create the image
$bgcolor = imagecolorallocate($im,255,255,255);//Background color
$jcolor = imagecolorallocate($im,255,255,0);//The background color of the rectangle
$acolor = imagecolorallocate($im,0,0,0);//The color of the line
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 the 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,40,40,300);
?>

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