如何在PHP中使用foreach循环迭代关联数组()

给定两个数组arr1和2号大小为n。任务是在foreach循环中迭代两个数组。两个数组可以使用foreach循环合并为一个数组。
数组:PHP中的数组是一种数据结构, 它允许在单个变量下存储相似数据类型的多个元素, 从而节省了为每个数据创建不同变量的工作。数组有助于创建相似类型的元素列表, 可以使用它们的索引或键来访问它们。
例子:

Input : $sides = array('Up', 'Down', 'Left', 'Right')$directions = array('North', 'South', 'West', 'East')Output :Up => NorthDown => SouthLeft => WestRight => East

范例1:本示例使用foreach循环显示关联数组的元素。
< ?php// Declare an associative array $aso_arr = array ( "Up" => "North" , "Down" => "South" , "Left" => "West" , "Right" => "East" ); // Use foreach loop to traverse each // elements of array and display its // key and value foreach ( $aso_arr as $side => $direc ) { echo $side . " => " . $direc . "\n" ; }?>

输出如下:
Up => NorthDown => SouthLeft => WestRight => East

【如何在PHP中使用foreach循环迭代关联数组()】范例2:本示例使用数组显示带有值的索引。
< ?php// Declare an array $sides = array ( "Up" , "Down" , "Left" , "Right" ); // Use foreach loop to display the // elements of array foreach ( $sides as $index => $value ) { echo "sides[" . $index . "] => " . $value . " \n" ; }?>

输出如下:
sides[0] => Up sides[1] => Down sides[2] => Left sides[3] => Right

注意:
索引数组的每个条目都类似于一个关联数组, 其中键是索引号。
例如:
$sides = array("00"=> "Up", "01"=> "Down", "02"=> "Left", "03"=> "Right"); $directions = array("00"=> "North", "01"=> "South", "02"=> "West", "03"=> "East");

由于索引在所有索引数组中都是通用的, 因此它可以使用这些索引来访问其他数组中的值。
范例3:
< ?php // Declare and initialize array $sides = array ( "Up" , "Down" , "Left" , "Right" ); $directions = array ( "North" , "South" , "West" , "East" ); // Use foreach loop to display array elements foreach ( $sides as $index => $side ) { echo $side . " => " . $directions [ $index ] . " \n" ; }?>

输出如下:
Up => North Down => South Left => West Right => East

    推荐阅读