使用foreach循環迭代MongoCursor問題使用PHP

Question

我想要使用foreach循環來迭代MongoCursor，如下面的代碼所示。循環只返回第一條記錄。任何人都可以弄清楚是什麼問題？

這裏是我的代碼

$usrcollection = $db->users; 
$user = new MongoId($userid); 
$where = array('_id' => $user); 
$filter = array('courses.coursename' =>true, 'courses.startdate' => true,'courses.duration' => true, 'courses.status' => true,'courses.completed' => true,'courses.institute' => true,'courses.instructor' => true,'courses.coursecreated' => true, '_id' => 0); 
$usercursor = $usrcollection->find($where,$filter); 

$j = 0; 
foreach ($usercursor as $value) { 
    echo($value['courses'][$j]['coursename']);  
    $j++; 
} 

的print_r的輸出是

Array ([courses] => Array ([0] => Array ([coursename] => Machine learning [startdate] => 2013-12-01 [duration] => 12 Weeks [institute] => Standford University [instructor] => Dr Lafore [status] => Inprogress [completed] => 20 [coursecreated] => MongoDate Object ([sec] => 1386751059 [usec] => 0)) [1] => Array ([coursename] => Fashion Design [startdate] => 2013-12-10 [duration] => 3 Weeks [institute] => MIT [instructor] => Ebay [status] => Inprogress [completed] => 0 [coursecreated] => MongoDate Object ([sec] => 1386753755 [usec] => 0)))) 

MongoDB的架構是低於

{ 
"_id": ObjectId("52972705f770dff815000002"), 
"badge": "Gold", 
"badgecount": NumberInt(3), 
"badgedate": ISODate("2013-11-13T05:53:49.0Z"), 
"badges": { 
"0": { 
    "badgename": "Silver", 
    "achievedon": ISODate("2013-10-05T05:53:49.0Z") 
    }, 
"1": { 
    "badgename": "Gold", 
    "achievedon": ISODate("2013-11-13T05:53:49.0Z") 
    } 
}, 
"courses": { 
"0": { 
    "coursename": "Machine learning", 
    "startdate": "2013-12-01", 
    "duration": "12 Weeks", 
    "institute": "Standford University", 
    "instructor": "Dr Lafore ", 
    "status": "Inprogress", 
    "completed": "20", 
    "coursecreated": ISODate("2013-12-11T08:37:39.0Z") 
    }, 
    "1": { 
    "coursename": "Fashion Design", 
    "startdate": "2013-12-10", 
    "duration": "3 Weeks", 
    "institute": "MIT", 
    "instructor": "Ebay", 
    "status": "Inprogress", 
    "completed": NumberInt(0), 
    "coursecreated": ISODate("2013-12-11T09:22:35.0Z") 
    } 
}, 
"datejoined": ISODate("2013-10-01T05:53:49.0Z"), 
"education": { 
    "0": "Msc Computer science" 
} 
} 

Answer 1

試試這個。

foreach ($usercursor as $value) { 
    for($i = 0; $i < count($value['courses']); $i++) { 
     echo($value['courses'][$i]['coursename']);  
    } 
} 

問題是find（）返回一個指針，而不是結果。您正在迭代的foreach只是將所有內容提取到行中並執行您想要的操作，而您需要另一個循環。