gistfile1.txt

<?php 
		$month = array();
		foreach ($a_input as $element) {$month[] = $element[0];}
		$serie1 = new XYDataSet();
		$serie1->addPoint(new Point("$month[0]", $a_input[0][1]));
		$serie1->addPoint(new Point("$month[1]", $a_input[1][1]));
		$serie1->addPoint(new Point("$month[2]", $a_input[2][1]));
		$serie1->addPoint(new Point("$month[3]", $a_input[3][1]));
		$serie1->addPoint(new Point("$month[4]", $a_input[4][1]));
		$serie1->addPoint(new Point("$month[5]", $a_input[5][1]));
		$serie1->addPoint(new Point("$month[6]", $a_input[6][1]));
		$serie1->addPoint(new Point("$month[7]", $a_input[7][1]));
		$serie1->addPoint(new Point("$month[8]", $a_input[8][1]));
		$serie1->addPoint(new Point("$month[9]", $a_input[9][1]));
		$serie1->addPoint(new Point("$month[10]", $a_input[10][1]));
		$serie1->addPoint(new Point("$month[11]", $a_input[11][1]));
?>

optimized nicely into:

<?php 
		$month = array();
		foreach ($a_input as $element) {$month[] = $element[0];}
		$serie1 = new XYDataSet();
		for ( $counter = 0; $counter < count($month); $counter += 1) {
			$serie1->addPoint(new Point("$month[$counter]", $a_input[$counter][1]));
        }
?>