Php array comparison and compute

Ferdinand · April 30, 2013

Hi I have these codes that try to compare content of array elements and add 1 for every similar comparison and zero for otherwise. But my codes seem not to be computing the final score, what could be the problem with my codes? Here are the codes:

<

<html>

<head>

<title>Chosen Answers</title>

</head>

<body>

<pre>

<?php

error_reporting(E_ALL);

ini_set('display_errors', '1');

//Posting of the chosen answers

$answers = $_POST['selected_answers'];

echo 'THE ANSWERS YOU HAVE CHOSEN ARE: ';

print_r($answers);

//Opening of the answers file, reading and printing it

$openFile = fopen("answers.txt", "r") or exit ("unable to open the answers file");

$fileContents = fread($openFile, filesize("answers.txt"));

trim($fileContents);

fclose($openFile);

$delimiter = " ";

$myArray = explode($delimiter, $fileContents);

$myArray_trimmed = array_map('trim', $myArray);

print_r($myArray);

echo '*' . $answers[0] . '*' . $myArray[0] . '*';

$score = $score1 = $score2 = $score3 = $score4 = $score5 = $score6 = $score7 = $score8 = 0;

//Computation of marks scored for the answered questions

if ($answers[0] == $myArray[0])

{

$score = 1;

}

if ($answers[1] == $myArray[1])

{

$score1 = 1;

}

if ($answers[2] == $myArray[2])

{

$score2 = 1;

}

if ($answers[3] == $myArray[3])

{

$score3 = 1;

}

if ($answers[4] == $myArray[4])

{

$score4 = 1;

}

if ($answers[5] == $myArray[5])

{

$score5 = 1;

}

if ($answers[6] == $myArray[6])

{

$score6 = 1;

}

if ($answers[7] == $myArray[7])

{

$score7 = 1;

}

if ($answers[8] == $myArray[8])

{

$score8 = 1;

}

$Total = $score + $score1 + $score2 + $score3 + $score4 + $score5 + $score6 + $score7 + $score8 ;

echo ' ';

echo "$Total";

?>

</pre>

</body>

</html>

>

What might be wrong with my codes? Thank you

akphidelt2007 · April 30, 2013

Well what do you think the problem is? When you print out $answers and $myArray are you getting the arrays that you think you are supposed to be getting? If that's the case, then is $myArray holding special characters?

I see you do $myArray_trimmed = array_map('trim', $myArray); But then you don't use $myArray_trimmed, you go back to using $myArray.

lemmin · April 30, 2013

What output ARE you getting?

Nothing jumps out as being incorrect so, like akphidelt2007 is saying, I don't think the data is exactly what you expect.

Also, you could really clean up the logic with a simply loop:

$Total = 0;
foreach ($answers as $i => $answer)
{
	if ($answer == $myArray[$i])
		$Total++;
}

Ferdinand · April 30, 2013

I have changed it as follows, but its still not computing the score, I don't know why

<

<html>

<head>

<title>Chosen Answers</title>

</head>

<body>

<pre>

<?php

error_reporting(E_ALL);

ini_set('display_errors', '1');

//Posting of the chosen answers

$answers = $_POST['selected_answers'];

echo 'THE ANSWERS YOU HAVE CHOSEN ARE: ';

$answers_trimmed = array_map('trim', $answers);

print_r($answers);

//Opening of the answers file, reading and printing it

$openFile = fopen("answers.txt", "r") or exit ("unable to open the answers file");

$fileContents = fread($openFile, filesize("answers.txt"));

trim($fileContents);

fclose($openFile);

$delimiter = " ";

$myArray = explode($delimiter, $fileContents);

//Deletes unnecessary spaces in the read text files.

$myArray_trimmed = array_map('trim', $myArray);

print_r($myArray_trimmed);

echo '*' . $answers[0] . '*' . $myArray_trimmed[0] . '*';

//Computation of marks scored for the answered questions

$Total = 0;

foreach ($answers as $i => $answer)

{

if ($answer == $myArray_trimmed[$i])

$Total++;

}

echo ' ';

echo "$Total";

?>

</pre>

</body>

</html>

and the score is 0

>

Ferdinand · April 30, 2013

Thanks to you all who have assisted me, Lemmin you gave me the idea and this is how I have implemented it


$score = 0;
$no_questions = 9;

for ($x = 0; $x < $no_questions; $x++) 
{
if ($answers_trimmed [$x]== $myArray_trimmed[$x])
				{
				$score++;
				}
}
echo '<br />';
echo "<b><u>$score</u></b>";

akphidelt2007 · April 30, 2013

I'm glad you found a solution, but if that works... the previous foreach() loop solution should work also.

Edited April 30, 2013 by akphidelt2007

Ferdinand · April 30, 2013

I thinks it was some errors in the syntax. Thank you.

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Php array comparison and compute

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