How do I assign values obtained from a loop to array

Question

I want to assign or store the values I get from foreach loop into an array, so that I can use array sort function for the values. Please below is my code. It seems to create a whole new array for every loop with key = 0. And if i place the print statement below the loop, it will display only the last value obtained from the loop. I don't understand how it was explained in This Question

<?php  

  $studen_id = $this->db->get_where('student' , array('class_id' => $class_id))->result_array();
    foreach($studen_id as $row){
    $mark_obtained = $this->crud_model->get_exam_total($row2['exam_id'] , $class_id , $row['student_id']);

        $student_mark = array($mark_obtained);

        // rsort($student_mark);

        echo "<li>";  print_r($student_mark);  echo "</li>";

    }
?>

Output

Dhara Parmar · Accepted Answer · 2016-05-04 13:57:14Z

4

You need to add [] to generate proper array. Try this:

<?php  
  $studen_id = $this->db->get_where('student' , array('class_id' => $class_id))->result_array();
  $student_mark = array();
  foreach($studen_id as $row){
    $mark_obtained = $this->crud_model->get_exam_total($row2['exam_id'] , $class_id , $row['student_id']);
    $student_mark[] = $mark_obtained;
  }
?>

answered May 4, 2016 at 13:57

Dhara Parmar

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2 Comments

MonkeyZeus Over a year ago

3 correct answers but "Fastest gun in the west" gets my vote :-)

MonkeyZeus Over a year ago

Also, per OP's question, I recommend showing an example of using a sort function after the foreach() loop.

Ghulam Ali · Accepted Answer · 2016-05-04 13:57:33Z

3

Create an empty array outside the loop:

$Array = array();

Within the loop add the values:

$Array[] = $mark_obtained;

After the end of loop test your array:

print_r($Array);

answered May 4, 2016 at 13:57

Ghulam Ali

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1 Comment

4Jean Over a year ago

Thanks guys for all the answers it worked. Im grateful

Webomatik · Accepted Answer · 2016-05-04 13:58:21Z

1

To create only one array, use this form:

$student_mark = array();
foreach($studen_id as $row){
 $mark_obtained = ......
  $student_mark[] = $mark_obtained;
  ....

answered May 4, 2016 at 13:58

Webomatik

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Comments

Jean-Luc Barat · Accepted Answer · 2016-05-04 14:25:20Z

1

Try to use array_push(). example:

<?php
    $student_mark = array();
    $studen_id = $this->db->get_where('student' , array('class_id' => $class_id))->result_array();

    foreach($studen_id as $row){
        $mark_obtained = $this->crud_model->get_exam_total($row2['exam_id'] , $class_id , $row['student_id']);

        array_push($student_mark, $mark_obtained);

        // rsort($student_mark);

        echo "<li>";  print_r($student_mark);  echo "</li>";
    }
?>

$student_marks is now a flat array...

Regards.

edited May 4, 2016 at 14:25

answered May 4, 2016 at 14:02

Jean-Luc Barat

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3 Comments

MonkeyZeus Over a year ago

Ahem, shouldn't it be array_push($student_mark, $mark_obtained); ?

Jean-Luc Barat Over a year ago

Sorry, I edit my post in order to use array_merge... You talk about the array() function, yeah copy/paste error ;).

MonkeyZeus Over a year ago

$mark_obtained is not an array so array_merge() is going to produce an error...

Ivan · Accepted Answer · 2016-05-04 14:47:32Z

1

I think this is what you want ...

$student_mark =array();
$studen_id = $this->db->get_where('student' , array('class_id' => $class_id))->result_array();
foreach($studen_id as $row)
{
    $mark_obtained = $this->crud_model->get_exam_total($row2['exam_id'] , $class_id , $row['student_id']);
    $student_mark[] = $mark_obtained;        
}

sort($student_mark);
$arrlength = count($student_mark);

for($x = 0; $x < $arrlength; $x++) 
{
    echo "<li>".$student_mark[$x]."</li>";
}

edited May 4, 2016 at 14:47

Ivan

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answered May 4, 2016 at 14:02

Manjeet Barnala

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