get the next key in array in php foreach loop

Question

I have a select box and wanting to get the key of the next value in array to go with the option here is my code

<select>

<?php foreach ($make as $key => $make):?>
      <option value="<?php echo next($key);//not correct ?> - <?php echo $key; ?>"> <?php echo $make; ?></option>
<?php endforeach; 

Here is the array

 Array
(
    [0] => Brand
    [1] => Alfa Romeo
    [123] => Alpina
    [142] => Aston Martin
    [152] => Audi
    [619] => Bentley
    [640] => BMW
    [1122] => Buick

)

Answer 1

This will work with an associative array as well as numerically indexed:

<?php foreach ($make as $key => $value):?>
    <?php next($make); ?>
    <option value="<?php echo key($make); ?> - <?php echo $key; ?>"> <?php echo $value; ?></option>
<?php endforeach; ?>

Note, it's confusing and probably a bad idea to use the same variable name for iterating as the array. so instead of foreach ($make as $key => $make) I did foreach ($make as $key => $value) here.

The code above simply advances the pointer on the array and then gets the key for your option value using key() . Since there is no next key on the final array element, the value will be empty.

Answer 2

You can resolve your issue with a lot of solution, but if you have an assoiatve array or none order array or not numirc, you can use this:

<?php
$array = ["a" => 1, "b" => 2, "c" => 3, 1 => "aa"];

next($array);
$key = key($array);
echo $key;
prev($array);
$key = key($array);
echo $key;

Else, if array is ordered and numeric you can use $key + 1 ;

Answer 3

Simple way to get key of next element is to use array_search of next element of array eg

<?php foreach ($makers as $key => $make):?>
  <option value="<?php echo array_search( next($makers), $makers );"> <?php echo $make; ?></option>
 <?php endforeach; 

Hope this helps.

Answer 4

try this function. it finds current key of given value in the array, and from that found key's position, you can get next/previous key with $increment Ex: when $increment=1 , it finds next key when $increment=2 , it finds 2 next key when $increment=-1 , it finds 1 previous key, and so on.

function sov_find_key($findvalue, $array, $increment) {
    reset($array);
    $key = array_search($findvalue, $array);
    
    if ($key === false || $key === 0){
        return false;
    }
    
    if ($increment === 0){
        return $key;
    }
    
    $isNegative = $increment < 0 ? true:false;
    $increment = abs($increment);
    
    while(key($array) !== $key) {
        next($array);
    }
    
    $x=0;
    while($x < $increment) {
        if( $isNegative ){
            prev($array);
        } else {
            next($array);
        }
        $x++;
    }
    
    return key($array);
} 

DEMO: https://3v4l.org/CSSmR

Answer 5

<select>

<?php 
foreach ($make as $key => $make):
?>
      <option value="<?php echo $key + 1; ?> - <?php echo $key; ?>"> 
<?php echo $make; 
?>
</option>
<?php 
endforeach; 

Just increment the $key by 1, and you will have the next array element if the keys are in order and are numeric.