PHP, Structures and Functions of ARRAY

This function behaves like current, with one difference, it advances the internal ARRAY pointer one place forward before returning the element value.

This function returns the next ARRAY value and advances the internal ARRAY pointer by one.

This function returns the ARRAY value in the next place that's pointed to by the internal ARRAY pointer, or FALSE if there are no more elements.

To test the returned value the operator === must be used.


<?php

mix next ( arr &$array )


where,

$array = The input ARRAY

?>

$array

The given input array.

Can be passed by reference.

EXERCISE


<?php

$arr01a = array("countries" => array("Brasil", "Chile"), 
                        "continent" => "South America"); 

echo 'The given ARRAY:<br>'; 
print_r($arr01a);

echo '<br><br>The pointer advances the 1st time.';
echo '<br>The current INDEX:<br>';

next($arr01a);

$ndx01ca = key($arr01a);

// The current element
$ele01ca = current($arr01a);

print_r($ndx01ca);
echo '<br><br>The current ELEMENT:<br>';

print_r($ele01ca);

?>

EXERCISE


<?php

$arr02a = ["countries" => ["Brasil", "Chile"], 
                        "continent" => "South America"]; 
echo 'The given ARRAY:<br>'; 
print_r($arr02a);

echo '<br><br>The pointer advances the 1st time.';
echo '<br>The current INDEX:<br>';
next($arr02a);

$ndx02ca1 = key($arr02a);
print_r($ndx02ca1);

echo '<br><br>The current ELEMENT:<br>';
$ele02ca1 = current($arr02a);
print_r($ele02ca1);

echo '<br><br>The pointer advances the 2nd time.';
echo '<br>The current INDEX:<br>';
next($arr02a);

$ndx02ca2 = key($arr02a);
var_dump($ndx02ca2);

echo '<br><br>The current ELEMENT:<br>';
$ele02ca2 = current($arr02a);
var_dump($ele02ca2);


?>

RESULT

The given ARRAY:
Array ( [countries] => Array ( [0] => Brasil [1] => Chile ) [continent] => South America )

The pointer advances the 1st time.
The current INDEX:
continent

The current ELEMENT:
South America

The pointer advances the 2nd time.
The current INDEX:
NULL

The current ELEMENT:
bool(false)

EXERCISE


<?php

echo 'The given ARRAY:<br>'; 
$arr03a = array(1 => 1, 2 => 2, 3 => 4);

print_r($arr03a);

echo '<br><br>The pointer advances the 1st time.';
echo '<br>The current INDEX: ';
next($arr03a);

$ndx03ca1 = key($arr03a);
print_r($ndx03ca1);

echo '<br><br>The current ELEMENT: ';
$ele03ca1 = current($arr03a);
print_r($ele03ca1);

echo '<br><br>The pointer advances the 2nd time.';
echo '<br>The current INDEX: ';
next($arr03a);

$ndx03ca2 = key($arr03a);
print_r($ndx03ca2);

echo '<br><br>The current ELEMENT: ';
$ele03ca2 = current($arr03a);
print_r($ele03ca2);

?>

RESULT

The given ARRAY:
Array ( [1] => 1 [2] => 2 [3] => 4 )

The pointer advances the 1st time.
The current INDEX: 2

The current ELEMENT: 2

The pointer advances the 2nd time.
The current INDEX: 3

The current ELEMENT: 4