Question

让我有一个像这样的数组

Array
(
    [126] => pitch
    [134] => pithc2
    [155] => pithc3
    [87]  => pithc4
    [45]  => pithc5
    [192] => pithc6
)

现在有没有办法从特定键应用此数组中的循环？示例：我想在155之后输出，然后输出看起来像

1. pitch4,
2. pithc5
3. pithc6

如果我想在45之后获得输出，那么输出看起来像

1. pithc6

Answer 1

这应该适合你：

在这里，我使用reset()，next()，current()，key()，end()按照您的意愿循环播放数组

<?php

    $arr = array(126 => "pitch", 134 => "pithc2", 155 => "pithc3", 87  => "pithc4", 45  => "pithc5", 192 => "pithc6");
    $from = 134;

    //Get last element + rest the array
    $end = end($arr);
    reset($arr);

    //set array pointer to '$from'
    while(key($arr) != $from) next($arr);


    while(current($arr) != $end) {

        next($arr);
        //prints the current array element and goes to the next one
        echo current($arr) . "<br />";

    }

?>

输出：

pithc3
pithc4
pithc5
pithc6

如果你想限制应该打印多少元素，你可以使用它：

<?php

    $arr = array(126 => "pitch", 134 => "pithc2", 155 => "pithc3", 87  => "pithc4", 45  => "pithc5", 192 => "pithc6");
    $from = 134;
    $howmany = 6;

    //Get last element + rest the array
    $end = end($arr);
    reset($arr);

    //set array pointer to '$from'
    while(key($arr) != $from) next($arr);

    //go through '$howmany' times
    for($i = 0; $i < $howmany; $i++) {

        //prints the current array element and goes to the next one
        echo current($arr) . "<br />";

        //rest the array to the beginning, while it reached the end
        if(current($arr) == $end)
            reset($arr);
        else
            next($arr);

    }

?>

输出：

pithc2
pithc3
pithc4
pithc5
pitch6
pithc

有没有办法从php中的特定键循环数组

1 个答案: