Question

我想在PHP数组中获取下一个值，例如：

$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';

请如何运行我的代码来实现此目标

Answer 1

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];

Answer 2

使用next()功能：

另外：使用current（）或prev（）

$array = array('a', 'b', 'c', 'd', 'e', 'f');

$current= current($array); // 'a'
$nextVal = next($array); // 'b'
$nextVal = next($array); // 'c'

// ...

Answer 3

$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];

在处理大型数组时，

array_search（）比执行array_flip（）要慢。我上面描述的方法远更具可扩展性。

Answer 4

使用array_search，并为数组中的next / prev项增加/减少。

$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

Answer 5

看一下这段代码示例，以便更好地理解面向对象的数组导航方式：

$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();

获取php数组中的下一个值

5 个答案: