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each()
函数返回当前元素的键名和键值,并将内部指针向后移动:
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
print_r (each($people));
?>
执行结果
Array ( [1] => Peter [value] => Peter [0] => 0 [key] => 0 )
each()
函数返回当前元素的键名和键值,并将内部指针向后移动。
该元素的键名和键值返回到带有四个元素的数组中。两个元素(1 和 Value)包含键值,两个元素(0 和 Key)包含键名。
相关的方法:
提示:each() 函数在 PHP 7.2.0 中被弃用了。
each(array)
参数 | 描述 |
---|---|
array | 必需。规定要使用的数组。 |
#1 与页面顶部的实例相同,但是本例通过循环输出整个数组:
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
reset($people);
while (list($key, $val) = each($people))
{
echo "$key => $val<br>";
}
?>
执行结果
0 => Peter
1 => Joe
2 => Glenn
3 => Cleveland
#2 所有相关方法的演示:
<?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
?>
执行结果
Peter
Joe
Joe
Peter
Cleveland
Glenn
Glenn
Peter
Joe
Array ( [1] => Joe [value] => Joe [0] => 1 [key] => 1 )