比较基于数组先前值的数组

Question

I have an array that looks like this:

Array ( 
    [0] => Array (  
        [START] => COI-COK 
        [RETURN] => CAI - DEL 
    ) 
    [1] => Array ( 
        [START] => COK - AMM 
        [RETURN] => CAI - DEL 
    ) 
)

I want to check if both 'start' and 'end' values of previous and current array are same or not. If not then, print some value. How can I do it?

This is my attempt:

foreach($data as $datas)
{     
    $old_start  = $datas['START'];
    $old_return = $datas['RETURN'];

    ...

    if( ($old_start == $datas['START']) && ($old_return == $datas['RETURN']))
    {

    }
    else
    {

    }
}

But it didn't work because all the time old_start value will be equal to $datas['START'].

print_r($data) shows this output:

Array ( 
    [0] => Array ( 
        [Sl] => 2 
        [TRAVELDAY] => 2015-11-11 
        [RETURNDAY] => 2015-11-27 
        [START] => COI-COK 
        [RETURN] => CAI - DEL 
    ) 
    [1] => Array ( 
        [Sl] => 1 
        [TRAVELDAY] => 2015-11-11 
        [RETURNDAY] => 2015-11-27 
        [START] => COK - AMM 
        [RETURN] => CAI - DEL 
    ) 
)

Answer 1

You have to put the assignment after the comparison, not before:

$old_start = '';
$old_return = '';
foreach($data as $datas)
{     
     //....
     if($old_start=='' || $old_start == $datas['START'] && $old_return == $datas['RETURN'])
     {
         //....
     }
     else
     {
         //code to be executed
     }

     $old_start = $datas['START'];
     $old_return = $datas['RETURN'];
}