Question

我有以下PHP代码

$selected_items = explode(',' , $vars['value']);

foreach($vars['options'] as $option) {
    $selected = ""; 
    if(in_array($option,$selected_items)){
        $selected = " selected = 'selected'";
      }
        echo "<option" . $selected . ">" . $option . "</option>";
}

  $selected_items:
  array
  0 => string 'Html' (length=4)
  1 => string ' Css' (length=4)
  2 => string ' HTML5' (length=6)
  3 => string ' CSS3' (length=5)
  4 => string ' Javascript' (length=11)

$vars['options']:
array
  0 => string 'Html' (length=4)
  1 => string 'Css' (length=3)
  2 => string 'HTML5' (length=5)
  3 => string 'CSS3' (length=4)
  4 => string 'Javascript' (length=10)
  5 => string 'Dhtml' (length=5)
  6 => string 'Actionscript' (length=12)
  7 => string 'Javafx' (length=6)
  8 => string 'Flex' (length=4)
  9 => string 'VisualBasic' (length=11)
  10 => string 'Ajax' (length=4)
  11 => string 'ASP.NET' (length=7)
  12 => string 'Java' (length=4)
  13 => string 'Php' (length=3)
  14 => string 'Perl' (length=4)
  15 => string 'Python' (length=6)
  16 => string 'J2ME' (length=4)
  17 => string 'VB.NET' (length=6)
  18 => string 'C#' (length=2)
  19 => string 'ASP' (length=3)
  20 => string 'JSP' (length=3)
  21 => string 'J2EE' (length=4)
  22 => string 'C++' (length=3)

在$selected_items中有一个数组。所以我必须检查$option中的值是否在$selected_items中。但它第一次工作。但第二次该值在数组中但条件变为false。

知道问题在哪里？

Answer 1

如果该字符串存在于数组中，它应该可以工作。如果您对上述问题有疑问，可以试试这个：

$selected_items = explode(',' , $vars['value']);

foreach($vars['options'] as $option) {
    $selected = ""; 
    foreach($selected_items as $selecteditems){
    if($option == $selecteditems)){
        $selected = " selected = 'selected'";
      }}
        echo "<option" . $selected . ">" . $option . "</option>";
}

Answer 2

只需删除数组$selected_items中字符串前的空格。

检查数组中的字符串失败

2 个答案: