Question

努力理解为什么函数中的foreach循环不会打印出includes数组中的所有值。非常感谢任何帮助。

数组$ this-＆gt;包括：

Array (
    [0] => http://localhost/assets/css/style.css
    [1] => http://localhost/assets/css/internal.css
    [2] => http://localhost/assets/css/custom-theme/jquery-ui-1.8.17.custom.css
    [3] => http://localhost/assets/js/jquery-ui-1.8.16.custom.min.js
)

功能：

public function print_includes()
{
    print_r($this->includes);
  // Initialize a string that will hold all includes
  $final_includes = '';
  foreach ($this->includes as $include)
  {
    // Check if it's a JS or a CSS file
    if (preg_match('/js$/', $include))
    {
      // It's a JS file
      $final_includes .= '<script type="text/javascript" src="' . $include . '"></script>';
    }
    elseif (preg_match('/css$/', $include))
    {
      // It's a CSS file
      $final_includes .= '<link href="' . $include . '" rel="stylesheet" type="text/css" />';
    }
    return $final_includes;
  }
}

使用$ this-＆gt; layouts-＆gt; print_includes（）打印的内容：

<link href="http://localhost/assets/css/style.css" rel="stylesheet" type="text/css" /></head>

Answer 1

你的return语句在foreach循环中，所以它只连接第一个link元素然后返回字符串作为函数的结果。尝试将其移出循环。

Answer 2

让你退出foreach循环


foreach ($this->includes as $include)
  {
    // Check if it's a JS or a CSS file
    if (preg_match('/js$/', $include))
    {
      // It's a JS file
      $final_includes .= '';
    }
    elseif (preg_match('/css$/', $include))
    {
      // It's a CSS file
      $final_includes .= '';
    }
  }
return $final_includes;

Answer 3

你正在使用foreach中的返回值，导致它在第一次循环后停止

public function print_includes()
{
    print_r($this->includes);
  // Initialize a string that will hold all includes
  $final_includes = '';
  foreach ($this->includes as $include)
  {
    // Check if it's a JS or a CSS file
    if (preg_match('/js$/', $include))
    {
      // It's a JS file
      $final_includes .= '<script type="text/javascript" src="' . $include . '"></script>';
    }
    elseif (preg_match('/css$/', $include))
    {
      // It's a CSS file
      $final_includes .= '<link href="' . $include . '" rel="stylesheet" type="text/css" />';
    }
   }
    return $final_includes;

}

Answer 4

我认为您的foreach循环不正确

foreach($this->includes as $inc) {

    return $final_includes; # should not be here.
}

Foreach不会返回数组中的所有值

4 个答案: