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@ 2016-04-28T10:21:47Z

<?php

$attendance = array(
                array(
                    "student_id" => "1",
                    "date" => "2016-04-24"
                )
            );
        

$students = array(
                array(
                    "student_id" => "1",
                    "Reason" => "",
                    "date" => "2016-04-24"
                ),
                array(
                    "student_id" => "6",
                    "Reason" => "1",
                    "date" => "2016-04-24"
                )
            );

$atts = array();
foreach($attendance as $att) 
{
    $atts[] = $att['student_id'];
}


foreach($students as &$student) {
    if(in_array($student['student_id'], $atts))
    {
        $student['Reason']='1';
    }
    else
    {
        $student['Reason']='0';
    }
}
echo '<pre>',print_r($students,1),'</pre>';

Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.24, 8.3.0 - 8.3.13: <pre>Array ( [0] => Array ( [student_id] => 1 [Reason] => 1 [date] => 2016-04-24 ) [1] => Array ( [student_id] => 6 [Reason] => 0 [date] => 2016-04-24 ) ) </pre>

preferences:dark modelive preview

63.13 ms | 408 KiB | 5 Q