I want to get the next value in a PHP array for example:
$array = array('a', 'b', 'c', 'd', 'e', 'f');
$current_array_val = 'c';
//so I want to run a code to get the next value in the array and
$next_array_val = 'd';
//And also another code to get the previous value which will be
$prev_array_val = 'b';
Please how do I run my code to achieve this
http://php.net/manual/ro/function.array-search.php
$index = array_search($current_array_val, $array);
if($index !== false && $index > 0 ) $prev = $array[$index-1];
if($index !== false && $index < count($array)-1) $next = $array[$index+1];
Here are another solution,
$values = array_values($array);
$search=array_search($current_array_val,$values);
$next=$values[(1+$search)%count($values)];
Use array_search, and increment/decrement for next/prev item in array.
$array = array('a', 'b', 'c', 'd', 'e', 'f');
$current_array_val = array_search('c', $array);
//so I want to run a code to get the next value in the array and
$next_array_val = $array[$current_array_val+1];
//And also another code to get the previous value which will be
$prev_array_val = $array[$current_array_val-1];
echo $next_array_val; // print d
echo $prev_array_val; // print b
$array = array('a', 'b', 'c', 'd', 'e', 'f');
$flipped_array = array_flip($array);
$middle_letter = 'c'; //Select your middle letter here
$index_of_middle_letter = $flipped_array[$middle_letter];
$next_index = $index_of_middle_letter + 1;
$prev_index = $index_of_middle_letter - 1;
$next_item = $array[$next_index];
$prev_item = $array[$prev_index];
array_search() is slower than doing an array_flip() when it comes to dealing with large arrays. The method I have described above is far more scalable.
Take a look at this code sample for a better understanding of the object-oriented way of navigating through arrays:
$array = array('a', 'b', 'c', 'd', 'e', 'f');
$pointer = 'c';
// Create new iterator
$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();
$iterator->seek($pointer); //set position
// Go to the next value
$iterator->next(); // move iterator
// Assign next value to a variable
$nextValue = $iterator->current();
