Question

我有一个这样的数组：

array(53) { [0]=> string(2) "11" [1]=> string(1) "1" [2]=> string(2) "11" [3]=> string(1) "7" [4]=> string(2) "11" [5]=> string(1) "7" [6]=> string(2) "10" [7]=> string(2) "10" [8]=> string(1) "9" [9]=> string(1) "8" [10]=> string(1) "8" [11]=> string(2) "12" [12]=> string(1) "6" [13]=> string(2) "10" [14]=> string(2) "10" [15]=> string(2) "12" [16]=> string(1) "2" [17]=> string(1) "3" [18]=> string(1) "8" [19]=> string(1) "5" [20]=> string(1) "4" [21]=> string(1) "3" [22]=> string(1) "2" [23]=> string(1) "2" [24]=> string(1) "3" [25]=> string(1) "7" [26]=> string(1) "3" [27]=> string(1) "6" [28]=> string(1) "9" [29]=> string(1) "3" [30]=> string(1) "3" [31]=> string(2) "12" [32]=> string(2) "12" [33]=> string(1) "1" [34]=> string(2) "12" [35]=> string(1) "5" [36]=> string(1) "2" [37]=> string(1) "8" [38]=> string(1) "6" [39]=> string(1) "9" [40]=> string(1) "9" [41]=> string(2) "10" [42]=> string(1) "1" [43]=> string(1) "2" [44]=> string(1) "3" [45]=> string(2) "10" [46]=> string(1) "7" [47]=> string(1) "4" [48]=> string(2) "11" [49]=> string(2) "12" [50]=> string(1) "1" [51]=> string(1) "9" [52]=> string(1) "9" }

我希望此数组中的每个值都有两个字符长度，如果数组值为：9则更改为09。

有了这个，我无法实现......某个地方我错过了什么

foreach ($outMonth as $key => $value) {
    if (strlen($outMonth[$value]) == 1 ) {
        $outMonth[$value] = "0".$value;
        //echo (strlen($outMonth[$value])). "<br>";
    }
}

如果我转储，我得到了：

array(53) { [0]=> string(2) "11" [1]=> string(2) "01" [2]=> string(2) "11" [3]=> string(2) "03" [4]=> string(2) "11" [5]=> string(2) "05" [6]=> string(2) "10" [7]=> string(2) "10" [8]=> string(2) "08" [9]=> string(2) "09" [10]=> string(3) "010" [11]=> string(2) "12" [12]=> string(3) "012" [13]=> string(2) "10" [14]=> string(2) "10" [15]=> string(2) "12" [16]=> string(1) "2" [17]=> string(1) "3" [18]=> string(1) "8" [19]=> string(1) "5" [20]=> string(1) "4" [21]=> string(1) "3" [22]=> string(1) "2" [23]=> string(1) "2" [24]=> string(1) "3" [25]=> string(1) "7" [26]=> string(1) "3" [27]=> string(1) "6" [28]=> string(1) "9" [29]=> string(1) "3" [30]=> string(1) "3" [31]=> string(2) "12" [32]=> string(2) "12" [33]=> string(1) "1" [34]=> string(2) "12" [35]=> string(1) "5" [36]=> string(1) "2" [37]=> string(1) "8" [38]=> string(1) "6" [39]=> string(1) "9" [40]=> string(1) "9" [41]=> string(2) "10" [42]=> string(1) "1" [43]=> string(1) "2" [44]=> string(1) "3" [45]=> string(2) "10" [46]=> string(1) "7" [47]=> string(1) "4" [48]=> string(2) "11" [49]=> string(2) "12" [50]=> string(1) "1" [51]=> string(1) "9" [52]=> string(1) "9" }

您可以看到只有少数值被更改......

谢谢你的时间！

Answer 1

您应该使用密钥（$ outMonth [$ key]）来访问数组元素并更改值

  foreach ($outMonth as $key => $value) {
      if (strlen($value) === 1 ) {
          $outMonth[$key] = "0".$value;

      }
  }

Answer 2

更新数组值时，您提供了错误的索引：

foreach ($outMonth as $key => $value) {
    if (strlen($value) == 1 ) {
        $outMonth[$key] = "0".$value; //<-----------Need to add $key as index
        //echo (strlen($outMonth[$value])). "<br>";
    }
}

Answer 3

您想要的是str_pad功能，请查看documentation。它将向左或向右填充另一个字符串到给定长度的字符串。

foreach ($outMonth as $key => $value) {
    $outMonth[$key] = str_pad($value, 2, '0', STR_PAD_LEFT);
}

如果字符串长度等于1，则php数组更新值

3 个答案: