Question

php 5.2.5 我编写了函数来从MySQL数据库中获取模块。

function getModules($courses, $mod) {
global $DB;
$result = array();
foreach ($courses as $value) {
    $value->mods = array();
    $value->count = 0;
    $temp = $DB->get_records_sql("
        SELECT q.*, cm.idnumber as cmidnumber, q.course as courseid
        FROM {modules} m
        JOIN {course_modules} cm ON m.id = cm.module
        JOIN {".$mod."} q ON cm.instance = q.id
        WHERE m.name = '".$mod."' AND cm.course = ?", array($value->id)); 
    foreach ($temp as $vS) {
        $value->mods[] = $vS;
        $value->count++;
    }
    $result[] = $value;
}  
return $result;
}

尝试获取某些类型的模块（to_debug只是关于var_dump的一种包装）

$learningScorm = getModules($learning, 'scorm');
to_debug($learningScorm);  // in debug I can see right values.
echo '<br><br><br>';
$learningLesson = getModules($learning, 'lesson');
to_debug($learningScorm);// in debug I see what value of $learningScorm is replaced by value of $learningLesson
$testingQuiz = getModules($testing, 'quiz');
$labAssignment = getModules($lab, 'assignment');

我无法理解为什么这种替换正在发生如果你对这种行为有一些提示，请给我。

如果我评论这些行

$value->mods = array();
$value->count = 0;

然后$ learningScorm从$ learningScorm和$ learningLesson求和模块。似乎......似乎在功能O_O期间$课程不是本地的。我不知道该怎么想。

Answer 1

getModules是否返回引用？在这种情况下，两个变量都可能指向相同的信息。可能发生的事情的简化示例：

var $global = 'x';

function getModules($a){
  global $global;
  $global = $a;
  return &$global;
}

// $a becomes 'foo', or actually a reference to $global, which now 
// has the value 'foo'
$a = getModules('foo'); 

// $b also is a reference to $global, which now has the value 'bar'. 
// Therefor, both $a and $b will show the value 'bar.
$b = getModules('bar');

Answer 2

$ courses是本地的，但$ course包含的对象是真实对象。通过改变$ value，物品也会发生变化。

替换数组的值

2 个答案: