比较PHP中的数组值和更新表

Question

我有两个SQL选择语句在php $ resultA和$ resultB中的数组。该数组使用mysqli_fetch_array（MYSQLI_ASSOC）构建。我想比较每个科目的成绩，并得到改进，减少或保持相同的结果。最佳做法是将数组中的这些值进行比较，并将结果添加到新字段的数组末尾（即ReadingPerformance，MathPerformance，SciencePerformance，& AttendancePerformance），以便可以访问它们以便在表中显示

Array ([mID] => 1 [mFirst] => Mike [mLast] => Davis [mNumber] => 123456789 [mSchool] => SSAS [mGrade] => 8 [gID] => 0 [gYear] => 2017 [gReading] => A [gMath] => A [gScience] => B [gSemester] => Q1 [gDaysAbsent] => 1) 
Array ([mID] => 1 [mFirst] => Mike [mLast] => Davis [mNumber] => 123456789 [mSchool] => SSAS [mGrade] => 8 [gID] => 1 [gYear] => 2017 [gReading] => B [gMath] => B [gScience] => A [gSemester] => Q2 [gDaysAbsent] => 4) 

决赛桌头

Answer 1

注：mysqli_fetch_array（）在PHP7过时，考虑使用的mysqli类FETCH_ASSOC（）

我认为你已经订购了你的查询，可能是通过mID，这将使这种方式更容易。 我的建议是，你创建一个数组，你收集你的数据，然后通过它循环创建表（我会顺序写出来，但你应该考虑把它分成类方法）。注意：这是未经测试的。

// execute the query 
$result = mysqli_query($handler, $query); 

// create a stack to collect the data 
$data = array(); 

// the table header, will also be used to store values in order 
$metaData = array(
    'mID' => 'MemberID(system)', 
    'mFirst' => 'First Name', 
    // other meta data (make sure you use the field names)... 
); 

$grades = array(
    'gReading' => 'Reading', 
    'gMath' => 'Math', 
    'gScience' => 'Science', 
    'gDaysAbsent' => 'Absent' 
); 

// create a table header 
$tableHeader = $metaData; 
// create 3 fields for each subject 
foreach ($grades as $fieldname => $headline) { 
    $tableHeader[$fieldname . 'Q2'] = $headline . ' Q2'; 
    $tableHeader[$fieldname . 'Q1'] = $headline . ' Q1'; 
    $tableHeader[$fieldname . 'Performance'] = $headline . ' Performance'; 
} 

// read each row of the result 
while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)) { 
    // we haven't handled this user before 
    if (!array_key_exists($row['mID'], $data)) { 
     // create a row with the meta data 
     $tableRow = array(); 
     foreach ($metaData as $fieldname => $headline) { 
      $tableRow[$fieldname] = $row[$fieldname]; 
     } 
    } else { 
     // fetch this users previous data 
     $tableRow = $data[$row['mID']]; 
    } 
    // populate the grades for this quarter and calculate the performance 
    foreach ($grades as $gradename => $headline) { 
     // f.ex. gReadingQ1 
     $tableRow[$gradename . $row['gSemester']] = $row[$gradename]; 
     // calculate the performance 
     if ($tableRow[$gradename . 'Q1'] && $tableRow[$gradename . 'Q2']) { 
      // TODO: do some magic here 
      // f.ex. calculate the number of the letter in the alphabet and get the average 
      $tableRow[$gradename . 'Performance'] = 'SOMETHING'; 
     } 
    } 
    // store the row 
    $data[$row['mID']] = $tableRow; 
} 

// TODO: create the table in whatever format you want 
print_r($data);