title: two json data in php , one data is working well , another data is not working
body: <pre><code>&lt;?
  //data_send.php ------------------
  $json_data = '{"kim":{"age":"30","pay":"350"},"lee":{"age":"50","pay":"120"},"park":{"age":"40","pay":"180"}}';  // this json_data is working well
  $json_data = json_encode($json_data);
  ?&gt;
  &lt;form action="json_parse.php" method="post"&gt;
  &lt;input type=hidden name=json_data value=&lt;?=$json_data?&gt; &gt;
  &lt;input type="submit"&gt;
  &lt;/form&gt;
  
  
  &lt;?
  //json_parse.php ------------------
  $json_data = $_REQUEST[json_data];
  $json_data = str_replace('\\', '', $json_data);
  $output = json_decode($json_data); 
  echo $output-&gt;{'park'}-&gt;{'pay'};  
  //180 is printed
  ?&gt;
  
  
  
  
  &lt;?
  //data_send2.php ------------------
  $json =  '{"mem_nm":{"disp":"Name","type":"field","param":"0"},"mem_id":{"disp":"Id","type":"field","param":"1"},"mem_email":{"disp":"E-mail","type":"field","param":"2"},"mem_mobile":{"disp":"Phone","type":"bind","param","1-3|-"},"mem_out_yn":{"disp":"Retire","type":"conv","param":"aaa"},"reg_dt":{"disp":"JoinDate","type":"func","param":"convertDateTime"}}'; //this json_data not work
  
  $json_data = json_encode($json_data);
  ?&gt;
  &lt;form action="json_parse2.php" method="post"&gt;
  &lt;input type=hidden name=json_data value=&lt;?=$json_data?&gt; &gt;
  &lt;input type="submit"&gt;
  &lt;/form&gt;
  
  
  &lt;?
  //json_parse2.php ------------------
  $json_data = $_REQUEST[json_data];
  $json_data = str_replace('\\', '', $json_data);
  $output = json_decode($json_data); 
  echo $output-&gt;{'mem_nm'}-&gt;{'type'};  
  //expect 'field' is printed, but nothig is printed
  
  ?&gt;
  </code></pre>
  
  <p>second json data is not working.</p>
  
  <p>I don't know the difference of two json data.</p>