JSON字符串包含false不为空或为空

Question

我从托管网站获取的JSON字符串发生了某些变化。色彩元素现在返回false如果空了，我的脚本不捕获它 - 我得到未定义错误$color $time $emailbody

JSON：

[{"name":"Bowie Hospital Center","time":["","",""],"color":[false,false,false]}, 
{"name":"Calvert Memorial Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Charles Regional (UM)","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Doctors Community Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Fort Washington Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Germantown EC","time":["","",""],"color":[false,false,false]},{"name":"Holy Cross Germantown","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Holy Cross Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Laurel Regional Medical Center","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Malcolm Grow","time":["","",""],"color":[false,false,false]},{"name":"Montgomery Medical Center (MedStar)","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Prince Georges Hospital Center","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"Shady Grove Advent Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Southern Maryland Hospital\u00a0 (MedStar)","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"St. Mary\u2019s Hospital\u00a0 (MedStar)","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Suburban Hospital (JHM)","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"Walter Reed NMMC","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"Washington Adventist Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Childrens National Medical Center","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"George Washington Hospital","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"Georgetown University (MedStar)","time":["11:03","11:03","",""],"color":["background-color:#ffff00;color:#000000;","background-color:#ff0000;color:#000000;",false,false]}, 
{"name":"Howard University Hospital","time":["","","","",""],"color":[false,false,false,false,false]}, 
{"name":"MedStar Washington Hospital Center","time":["11:03","","","",""],"color":["background-color:#ffff00;color:#000000;",false,false,false,false]}, 
{"name":"Providence Hospital","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"Sibley Memorial Hospital (JHM)","time":["","","",""],"color":[false,false,false,false]}, 
{"name":"United Medical Center","time":["","","",""],"color":[false,false,false,false]}] 

PHP：

function myArray($arry) { 
     $selected = array(5,6,7,10,12,15,17,18,22,24); 
     foreach($arry as $key => $value) { 
      if (in_array($key, $selected) || empty($selected)) { 
       $color .= $value['name']. chr(10); 
       $time .= $value['name']. chr(10); 
       $emailbody .= $value['name']. '<br>'; 
       $length = count($value["color"]); 

       // TEST of color alert 
       print($color + '<br>' + chr(10) + '<br>'); 
       print($time + '<br>'); 
       print($emailbody + '<br>'); 
       print($length + '<br>'); 
       // end 

       for ($i = 0; $i < $length; $i++) { 
        if($value['time'][$i] != "") {  

         if(preg_match('/#ff0000/', $value['color'][$i])) { 
          $value['color'][$i] = '<font color="#ff0000">RED</font>'; 
         } 
         if(preg_match('/#ffff00/', $value['color'][$i])) { 
          $value['color'][$i] = '<font color="#ffff00">YELLOW</font>'; 
         } 
         if(preg_match('/#006600/', $value['color'][$i])) { 
          $value['color'][$i] = '<font color="#006600">GREEN (Mini Disaster)</font>'; 
         } 
         if(preg_match('/#9933cc/', $value['color'][$i])) { 
          $value['color'][$i] = '<font color="#9933cc">PURPLE (Trauma ByPass)</font>'; 
         } 
         if(preg_match('/#ff6600/', $value['color'][$i])) { 
          $value['color'][$i] = '<font color="#ff6600">ORANGE (ReRoute)</font>'; 
         } 

         $time .= ' <b>' . $value["color"][$i] . '</b> - <i>' . $value["time"][$i] . '</i>' . chr(10); 
         $color .= ' <b>' . $value["color"][$i] . '</b>' . chr(10); 
         $emailbody .= ' <b>' . $value["color"][$i] . '</b> - <i>' . $value["time"][$i] . '</i><br>'; 

        } 
       } 
      } 
     } 
     return array($time, $color, $emailbody); 
    } 

ERROR：

Notice: Undefined variable: color in /index.php on line 5 
Notice: Undefined variable: time in /index.php on line 6 
Notice: Undefined variable: emailbody in /index.php on line 7 

Answer 1

它与JSON无关。该通知抱怨线

  $color .= $value['name']. chr(10); 
      $time .= $value['name']. chr(10); 
      $emailbody .= $value['name']. '<br>'; 

$color .= $value['name']为$color = $color . $value['name']的快捷方式的语法;

第一次迭代$color未定义，因此您会收到通知。

您需要初始化这些变量摆脱告示：

function myArray($arry) { 
    $selected = array(5,6,7,10,12,15,17,18,22,24); 
    $color = $time = $emailbody = ""; // <== initialising with empty strings 
    foreach($arry as $key => $value) { 
    ......