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PHP将前导0添加到范围_Php_Loops_Foreach - Fatal编程技术网
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PHP将前导0添加到范围

php loops

PHP将前导0添加到范围,php,loops,foreach,Php,Loops,Foreach,如何为1-9渲染前导0 <?php foreach (range(1, 12) as $month): ?> <option value="<?=$month?>"><?=$month?></option> <?php endforeach?> 使用sprintf使用以下任一选项： 或： if（$month

如何为1-9渲染前导0

<?php foreach (range(1, 12) as $month): ?>


                  <option value="<?=$month?>"><?=$month?></option>

                <?php endforeach?>


使用sprintf
使用以下任一选项：

或：


if（$month<10）回显“0”$月份


<?php foreach (range(1, 12) as $month): ?>
  <option value="<?= sprintf("%02d", $month) ?>"><?= sprintf("%02d", $month) ?></option>
<?php endforeach?>


或


if（$month<10）$month='0'$月份


<?php foreach (range(1, 12) as $month): ?>
  <option value="<?= sprintf("%02d", $month) ?>"><?= sprintf("%02d", $month) ?></option>
<?php endforeach?>



数组映射（函数（$day）{
返回str_pad（$day，2，'0'，str_pad_LEFT）；
}，范围（1,31））；


结果:


Array
(
    [0] => 01
    [1] => 02
    [2] => 03
    [3] => 04
    [4] => 05
    [5] => 06
    [6] => 07
    [7] => 08
    [8] => 09
    [9] => 10
    [10] => 11
    [11] => 12
    [12] => 13
    [13] => 14
    [14] => 15
    [15] => 16
    [16] => 17
    [17] => 18
    [18] => 19
    [19] => 20
    [20] => 21
    [21] => 22
    [22] => 23
    [23] => 24
    [24] => 25
    [25] => 26
    [26] => 27
    [27] => 28
    [28] => 29
    [29] => 30
    [30] => 31
)



适用于PHP5.3+。你自己试试看：
我不知道
stru-pad
。。。酷。

<?php foreach (range(1, 12) as $month): ?>
  <option value="<?= sprintf("%02d", $month) ?>"><?= sprintf("%02d", $month) ?></option>
<?php endforeach?>



Array
(
    [0] => 01
    [1] => 02
    [2] => 03
    [3] => 04
    [4] => 05
    [5] => 06
    [6] => 07
    [7] => 08
    [8] => 09
    [9] => 10
    [10] => 11
    [11] => 12
    [12] => 13
    [13] => 14
    [14] => 15
    [15] => 16
    [16] => 17
    [17] => 18
    [18] => 19
    [19] => 20
    [20] => 21
    [21] => 22
    [22] => 23
    [23] => 24
    [24] => 25
    [25] => 26
    [26] => 27
    [27] => 28
    [28] => 29
    [29] => 30
    [30] => 31
)