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php – Traverse multi dimensional array recursively without using foreach

Posted by: admin July 12, 2020 Leave a comment

Questions:

I have an array like this and the code using foreach loop.

$arr = array( array ( array( 'CAR_TIR', 'Tires', 100 ),
           array( 'CAR_OIL', 'Oil', 10 ),
           array( 'CAR_SPK', 'Spark Plugs', 4 )
          ),
       array ( array( 'VAN_TIR', 'Tires', 120 ),
           array( 'VAN_OIL', 'Oil', 12 ),
           array( 'VAN_SPK', 'Spark Plugs', 5 )
          ),
       array ( array( 'TRK_TIR', 'Tires', 150 ),
           array( 'TRK_OIL', 'Oil', 15 ),
           array( 'TRK_SPK', 'Spark Plugs', 6 )
          )
      );


function recarray($array)
{
    foreach($array as $key=>$value)
    {
        if(is_array($value))
        {
            RecArray($value);
        }
        else
        {
            echo "key = $key value = $value";
       }
    }
}
recarray($arr);

I have to traverse the array using recursion and without using foreach.

How to&Answers:

Simple depth first search:

function DFS($array) {      
    for ($i = 0; $i < count($array); $i ++) {
        if (is_array($array[$i])) {
            DFS($array[$i]);
        }
        else {
            echo "key: ".$i.", value: ".$array[$i]."<br />";
        }
    }
}

Answer:

What about array_walk_recursive()? it can apply function to each element of the array:

function test_print($value, $key)
{
    echo "key = $key value = $value";
}

array_walk_recursive($arr, 'test_print');

not tested

Answer:

I would use a while loop – like

while($i < count($array)) {}