source: trunk/xgraph/jpgraph/Examples/manual_textscale_ex4.php

<?php // content="text/plain; charset=utf-8"
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_line.php');

define('DATAPERMONTH',40);

// Some data
$m=$gDateLocale->GetShortMonth();
$k=0;
for($i=0; $i < 480; ++$i) {
    $datay[$i] = rand(1,40);
    if( $i % DATAPERMONTH === 0 )
        $months[$i] = $m[(int)($i/DATAPERMONTH)];
    else
        $months[$i] = 'xx';
}


// New graph with a drop shadow
$graph = new Graph(400,200);
//$graph->SetShadow();

// Use a "text" X-scale
$graph->SetScale('textlin');

// Specify X-labels
$graph->xaxis->SetTickLabels($months);
$graph->xaxis->SetTextTickInterval(DATAPERMONTH,0);
$graph->xaxis->SetTextLabelInterval(2);

// Set title and subtitle
$graph->title->Set('Textscale with tickinterval=2');

// Use built in font
$graph->title->SetFont(FF_FONT1,FS_BOLD);

$graph->SetBox(true,'red');

// Create the bar plot
$lp1 = new LinePlot($datay);
$lp1->SetLegend('Temperature');

// The order the plots are added determines who's ontop
$graph->Add($lp1);

// Finally output the  image
$graph->Stroke();

?>