JSON字符串到PHP数组NULL

Question

这是我的代码：

    var_dump(json_decode($data['event']->options['meals']['options'][0]['option'], true));
    echo '<br />';echo '<br />';
    var_dump($data['event']->options['meals']['options'][0]['option']);
    echo '<br />';echo '<br />';
    var_dump(json_decode('[{"name":"Petit Tenderloin","description":"Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "},{"name":"Chicken Piccatta","description":"In lemon caper sauce, served with a timbal of wild rice and vegetables. "}]', true));

这是我的输出：

NULL

string(279) "[{"name":"Petit Tenderloin","description":"Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "},{"name":"Chicken Piccatta","description":"In lemon caper sauce, served with a timbal of wild rice and vegetables. "}]"

array(2) { [0]=> array(2) { ["name"]=> string(16) "Petit Tenderloin" ["description"]=> string(115) "Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. " } [1]=> array(2) { ["name"]=> string(16) "Chicken Piccatta" ["description"]=> string(72) "In lemon caper sauce, served with a timbal of wild rice and vegetables. " } }

为什么当我输入一个字符串字面量时，我得到了正确的数组，但是当我传入一个变量时，我得到了 NULL？我觉得我错过了一些超级简单的东西......

编辑：找出原因 看起来该变量有一个自然不会出现在 HTML 中的换行符。看起来新行字符打破了 json_decode...

除了删除新行之外，任何人都知道解决此问题的方法吗？ （如果可以的话，我宁愿保留它们）

Answer 1

确保数组在您var_dump 其内容的第一行中有数据。我无法重现您的错误。

我的代码：

<?php

$data['event']->options['meals']['options'][0]['option'] = '[{"name":"Petit Tenderloin","description":"Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "},{"name":"Chicken Piccatta","description":"In lemon caper sauce, served with a timbal of wild rice and vegetables. "}]';

var_dump(json_decode($data['event']->options['meals']['options'][0]['option'], true));
echo '<br />';echo '<br />';
var_dump($data['event']->options['meals']['options'][0]['option']);
echo '<br />';echo '<br />';
var_dump(json_decode('[{"name":"Petit Tenderloin","description":"Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "},{"name":"Chicken Piccatta","description":"In lemon caper sauce, served with a timbal of wild rice and vegetables. "}]', true));

?>

这是它为我生成的输出：

array(2) {
  [0] =>
  array(2) {
    'name' =>
    string(16) "Petit Tenderloin"
    'description' =>
    string(115) "Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "
  }
  [1] =>
  array(2) {
    'name' =>
    string(16) "Chicken Piccatta"
    'description' =>
    string(72) "In lemon caper sauce, served with a timbal of wild rice and vegetables. "
  }
}
<br /><br />
string(278) "[{"name":"Petit Tenderloin","description":"Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "},{"name":"Chicken Piccatta","description":"In lemon caper sauce, served with a timbal of wild rice and vegetables. "}]"
<br /><br />
array(2) {
  [0] =>
  array(2) {
    'name' =>
    string(16) "Petit Tenderloin"
    'description' =>
    string(115) "Wrapped in Apple Wood Bacon, borsoun whipped mashed potatoes, roasted baby vegetable, with sun dried cherry sauce. "
  }
  [1] =>
  array(2) {
    'name' =>
    string(16) "Chicken Piccatta"
    'description' =>
    string(72) "In lemon caper sauce, served with a timbal of wild rice and vegetables. "
  }
}

Answer 2

未转义的换行符会破坏 json_decode，因为它不是有效的 JSON。

Previous question on escaping line breaks in JSON。

在那里查看 eyeliidlessness 的答案以保持换行符。简短的版本是您需要转义它们，例如：

$text = str_replace("\n", "\\n", $text);

或者，您可能希望用<br> 替换换行符，以便将它们转义以在浏览器中呈现。

你有GIGO。不确定您是否正在控制输入，但如果是，那么您应该在前端使用json_encode 对其进行转义，这将自动转义（并因此保留）换行符。