Showing createimage() as undefined function.

[Raju B]

Hi all
i had written code for displaying graph.but it showing error like this:

Fatal error: Call to undefined function imagecreate() in /var/www/graph.php on line 27

what i have to do for get graph properly.
My code is:

<?php
    # ------- The graph values in the form of associative array
    $values=array(
        "Jan" => 110,
        "Feb" => 130,
        "Mar" => 215,
        "Apr" => 81,
        "May" => 310,
        "Jun" => 110,
        "Jul" => 190,
        "Aug" => 175,
        "Sep" => 390,
        "Oct" => 286,
        "Nov" => 150,
        "Dec" => 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,43,43,43);
    $border_color=imagecolorallocate($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<=$horizontal_lines;$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< $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);
 
?>
 
 

[Markus]

You need the GD[1] extension to use that function.

[1] http://www.php.net/manual/en/image.installation.php

[Raju B]

thank you markus.
Now problem is solved.