Use a foreach loop, it loops through all the key=>value pairs:

 foreach($array as value){
     print "$key holds $value\n";
 }

Or to answer your question completely:

 foreach($array as $value){
     print $value."\n";
 }

You can achive it in this way

<?php

$products = array('Volvo', 'BMW', 'Toyota', 'Kijang');

foreach($products as $product){
    echo "'".$product."', ";
    foreach($products as $otherProduct){
        if($otherProduct == $product){
            // Skip the element
            continue;
        }
        echo "'".$otherProduct."', ";
    }
    echo "<br>";
}

You need to loop twice to get the result.

Try this

    <?php
        $set = array('0', '1', '2','3');
        $power_set = possible_set($set);
        echo "<pre>";
        print_r($power_set);
        echo "</pre>";
        function possible_set($array) {
            $results = array(array( ));
            foreach ($array as $element)
                foreach ($results as $inner_element)
                    array_push($results, array_merge(array($element), $inner_element));

            unset($results[0]);
            $results = array_values($results);
            return $results;
        }
    ?>

https://eval.in/516963