1)  stristr() 
IT find the first occurrence of "top" inside "who is on top", and return the rest of the string:

<?php
echo stristr("who is on top","top");
?>
returnns top

2)    array_walk_recursive()

The work of  array_walk_recursive() function runs each array
element in a user-defined function. The array's keys and values 
are parameters in the function.


<?php
$vehical = array('c' => 'car', 'b' => 'bike');
$second = array('vehical' => $vehical, 'big' => 'Truck');

function print_vehical($key, $value)
{
    echo "$value runs on  $key\n";
}

array_walk_recursive($second, 'print_vehical');
?>
                    
                

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