Untitled

<?php

/*#############################
* Developer: Mohammad Sharaf Ali
* Designation: Web Developer
* Version: 1.0
*/#############################

##################### CONSTANTS #####################
// grade equivalence constants
const IBCC_GRADES = array(
		'A*' => 90,
		'A' => 85,
		'B' => 75,
		'C' => 65,
		'D' => 55,
		'E' => 45);

const IBCC_MATRIC_TOTAL = 900;
const IBCC_INTERMEDIATE_TOTAL = 1100;


##################### HELPER METHODS #####################
function notEmptyString($str) {
	return $str !== '';
}

function getEquivalent($grade) {
	$percent = 0;

	if (array_key_exists($grade, IBCC_GRADES)) {
		$percent = IBCC_GRADES[$grade];
	}

	return $percent;
}

function significatDigits($num, $sep = '.', $sig = 2) {
    $cut = substr($num, 0, ((strpos($num, $sep) + 1) + $sig));

    return $cut;
}

function printResult($str) {
	echo '<pre>';
	echo $str;
	echo '</pre>';
}


##################### MAIN #####################
if (isset($_POST['submit'])) {
	$OLevelSum = 0;
	$OLevelTotal = 0;
	$ALevelSum = 0;
	$ALevelTotal = 0;

	$OLevelGrades = isset($_POST['grades_o']) ? $_POST['grades_o'] : array();
	$ALevelGrades = isset($_POST['grades_a']) ? $_POST['grades_a'] : array();

	if (!empty($OLevelGrades)) { // calculate Matric Equivalence Certificate
		$OLevelGrades = explode(',', $_POST['grades_o']); // validation when no comma separated
		$OLevelGrades = array_map('trim', $OLevelGrades);
		$OLevelGrades = array_filter($OLevelGrades, 'notEmptyString');

		foreach ($OLevelGrades as $OLevelGrade) {
			list($subject, $grade) = explode('-', $OLevelGrade); // validation when no hyphen separated

			$equivalentGrade = getEquivalent(strtoupper($grade));
			$OLevelSum += $subject * $equivalentGrade;

			if ($equivalentGrade > 0) {
				$OLevelTotal += $subject;
			}
		}

		$equivalentMarks = ceil(($OLevelSum / ($OLevelTotal * 100)) * IBCC_MATRIC_TOTAL);
		$equivalentPercent = ($equivalentMarks / IBCC_MATRIC_TOTAL) * 100;

		$toScreen = 'Matric Marks obtained:';
		$toScreen .= '<br />';
		$toScreen .= 'In number <strong>'. $equivalentMarks. '</strong> out of <strong>'. IBCC_MATRIC_TOTAL. '</strong>';
		$toScreen .= '<br />';
		$toScreen .= 'In percentage <strong>'. significatDigits($equivalentPercent). '%</strong>';

		printResult($toScreen);

		if (!empty($ALevelGrades)) { // calculate Intermediate Equivalence Certificate
			$ALevelGrades = explode(',', $_POST['grades_a']); // validation when no comma separated
			$ALevelGrades = array_map('trim', $ALevelGrades);
			$ALevelGrades = array_filter($ALevelGrades, 'notEmptyString');

			foreach ($ALevelGrades as $ALevelGrade) {
				list($subject, $grade) = explode('-', $ALevelGrade); // validation when no hyphen separated

				$equivalentGrade = getEquivalent(strtoupper($grade));
				$ALevelSum += $subject * $equivalentGrade;

				if ($equivalentGrade > 0) {
					$ALevelTotal += $subject;
				}
			}

			$equivalentMarks = ceil((($OLevelSum + $ALevelSum) / (($OLevelTotal + $ALevelTotal) * 100)) * IBCC_INTERMEDIATE_TOTAL);
			$equivalentPercent = ($equivalentMarks / IBCC_INTERMEDIATE_TOTAL) * 100;

			$toScreen = 'Intermediate Marks obtained:';
			$toScreen .= '<br />';
			$toScreen .= 'In number <strong>'. $equivalentMarks. '</strong> out of <strong>'. IBCC_INTERMEDIATE_TOTAL. '</strong>';
			$toScreen .= '<br />';
			$toScreen .= 'In percentage <strong>'. significatDigits($equivalentPercent). '%</strong>';

			printResult($toScreen);
		}
	}
}

?>

<html>
<head>
	<title>Script for calculating O and A Level's Equivalence</title>
</head>

<body>

<h4>O and A Level Equivalence Calculator</h4>

<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="POST">
	<input type="text" id="grades_o" name="grades_o" required autofocus tabindex="1" placeholder="Enter grades as 3-A, 2-B, 1-C, 1-D, 1-E" />
	<br /><br />

	<input type="text" id="grades_a" name="grades_a" tabindex="2" placeholder="Enter grades as 1-A*, 2-B" />
	<br /><br />

	<input type="submit" id="submit" name="submit" value="CALCULATE" tabindex="3" />
</form>

</body>
</html>