如何使用php中each方法

current() - 返回数组中的当前元素的值。
end() - 将内部指针指向数组中的最后一个元素，并输出。
next() - 将内部指针指向数组中的下一个元素，并输出。
prev() - 将内部指针指向数组中的上一个元素，并输出。
reset() - 将内部指针指向数组中的第一个元素，并输出。

each(array)

<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
 
reset($people);
 
while (list($key, $val) = each($people))
{
    echo "$key => $val<br>";
}
?>

0 => Peter
1 => Joe
2 => Glenn
3 => Cleveland

<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
 
echo current($people) . "<br>"; // The current element is Peter
echo next($people) . "<br>"; // The next element of Peter is Joe
echo current($people) . "<br>"; // Now the current element is Joe
echo prev($people) . "<br>"; // The previous element of Joe is Peter
echo end($people) . "<br>"; // The last element is Cleveland
echo prev($people) . "<br>"; // The previous element of Cleveland is Glenn
echo current($people) . "<br>"; // Now the current element is Glenn
echo reset($people) . "<br>"; // Moves the internal pointer to the first element of the array, which is Peter
echo next($people) . "<br>"; // The next element of Peter is Joe
 
print_r (each($people)); // Returns the key and value of the current element (now Joe), and moves the internal pointer forward
?>

Peter
Joe
Joe
Peter
Cleveland
Glenn
Glenn
Peter
Joe

Array ( [1] => Joe [value] => Joe [0] => 1 [key] => 1 )