PHP-将json_encode中的数组预匹配为str_replace（），并将其返回给数组

我有这个阵列：

 $form = array(
    array(
       "type" => "text",
       "value" => "
         Hello @name

         How old are you? @age

         How are you today? @condition"
    ),
    array(
       "type" => "font",
       "family" => "Arial",
       "size" => 6,
       "weight" => "Bold"
    )
 );

然后我做了这个

json\u encode（$form）

，它有以下输出：

 [ 
  {
   "type":"text",
   "value":"\r\n Hello @name\r\n\r\n How old are you? @age\r\n \r\n How are you today? @condition"
  },
  {
   "type":"font",
   "family":"Arial",
   "size":6,
   "weight":"Bold"
  }
 ]

问题是

json\u encode（）

 $old = array('@name','@age',@condition');

这个
$old
数据就是我将放入
str_replace（）中的数据

但是我想用数组的形式，比如用
@
符号获取所有数据

我们可以用预赛吗？或者还有其他方法吗？
是的，您可以使用

我会使用这样的函数来帮助我从任何类型的输入中获取数据：

/**
* We will take two param on this function
* $input is the data we will be look into
* $tags is reference to a array, we will store out result in this array.
*/
function fetch_tags($input, &$tags){
    if(is_array($input)){
        // If input is array, iterate it and pass the value to fetch_tags function
        foreach($input as $key => $value ){
            fetch_tags($value, $tags);
        }

        return true;
    }elseif(is_string($input)){
        /**
        * If its a string, we can preg_match now.
        * \@\S+ means we will take any string which follows a @
        * If we get any matches, we will store that result in $tags
        */
        if(preg_match_all('#(\@\S+)#', $input, $matches)){
            $tags = array_merge($tags, $matches[1]);
        }

        return true;
    }
    return false;
}

例如：

<?php

$form = array(
    array(
       "type" => "text",
       "value" => "
         Hello @name

         How old are you? @age

         How are you today? @condition"
    ),
    array(
       "type" => "font",
       "family" => "Arial",
       "size" => 6,
       "weight" => "Bold"
    )
 );

$words = [];

fetch_tags($form, $words);

print_r($words);

在
str_replace
中，你也可以传递数组。是的，我已经这样做了，先生，但我希望它像动态的一样，或者像其他什么东西一样获取所有的数据
@
在它上面的符号。谢谢你的朋友！：）
Array
(
  [0] => @name
  [1] => @age
  [2] => @condition
)