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以下是我的代碼。第一部分完美地工作，但第二個循環沒有產生任何結果。這是做什麼的，它尋找的時間表，然後拿出那些類，複製所有這些，並使用相同的數據，但不同的名稱作出新的時間表。Php for循環在另一個for循環內不能正常工作？
另一個for循環是將學生添加到時間表的類中。因爲我現在已經連續5天將我的頭撞在牆上，所以我有些人會很友善並且幫助我。
預先感謝您。代碼：
<?php
$Q = "INSERT INTO time_table(name, term, year) VALUES
('".$name."', '".$term."', '".$year."')";
$res = $db->query($Q);
//for generating the max table id
$sql2 = "select MAX(table_id) as table_id
from time_table
";
$res2 = $db->query($sql2);
$count2 = $res2->num_rows;
$row2 = $res2->fetch_assoc();
$table_id = $row2['table_id'];
$Q = "SELECT class_id as tcid, day as d, teacher_id as tei, location as l
FROM class_time_table
WHERE term='".$copy."'";
$res = $db->query($Q);
$num_results = $res->num_rows;
for ($i = 0; $i <$num_results; $i++) {
$row = $res->fetch_assoc();
$Q4 = "SELECT * FROM students_class WHERE class_id = '".$row['tcid']."' and term = '".$copy."'";
$res4 = $db->query($Q4);
$row2 = $res4->fetch_assoc();
//for generating the max table id
$class_sysq = "select MAX(class_sys_id) as class_sys_id
from students_class
";
$class_sysr = $db->query($class_sysq);
$count_class_sys = $class_sysr->num_rows;
$class_row = $class_sysr->fetch_assoc();
$class_sys_idf = $class_row['class_sys_id']+1;
$Q5 = "INSERT INTO students_class (class_sys_id, teachers_id, location, max_students, class_term_fee, class_name, class_sub_name, term, year) VALUES ('".$class_sys_idf."', '".$row2['teachers_id']."', '".$row2['location']."', '".$row2['max_students']."', '".$row2['class_term_fee']."', '".$row2['class_name']."', '".$row2['class_sub_name']."', '".$term."', '".$year."')";
$res5 = $db->query($Q5);
//for generating the max table id
$max_c_id = "select MAX(class_id) as ci
from students_class
";
$r_mci = $db->query($max_c_id);
$count_class_sys = $r_mci->num_rows;
$mci_row = $r_mci->fetch_assoc();
$max_c_idf = $mci_row['ci'];
$query2 = "INSERT INTO class_time_table(class_id, teacher_id, table_id, location, day, term, year) VALUES
('".$max_c_idf."', '".$row['tei']."', '".$table_id."', '".$row['l']."', '".$row['d']."', '".$term."', '".$year."')";
$result2 = $db->query($query2);
$student_q = "SELECT students.first_name as fn, students.last_name as ln, students.email as e, students.mobile_phone as mp, students.home_phone as hp, students.gender as g, students.dob as dob, students.term_fee as tf, students.join_date as jd, students.date_added as da, student_attending_class.class_id as ci FROM students, student_attending_class, class_time_table where students.student_sys_id = student_attending_class.student_id and student_attending_class.class_id = class_time_table.class_id and class_time_table.class_id = '".$row['tcid']."'";
$student_res = $db->query($student_q);
$student_num_results = $student_res->num_rows;
for ($i = 0; $i < $student_num_results; $i++) {
$theRow = $student_res->fetch_assoc();
//for generating the new system id
$sql3 = "select MAX(student_sys_id) as ssi
from students";
$res3 = $db->query($sql3);
$count3 = $res3->num_rows;
$row8 = $res3->fetch_assoc();
$student_system_num = $row8['ssi']+1;
$query10 = "INSERT INTO students(student_sys_id, first_name, last_name, email, mobile_phone, home_phone, gender, dob, fee_due, registration_fee, term_fee, fee_paid, join_date, date_added) VALUES
('".$student_system_num."', '".$theRow['fn']."', '".$theRow['ln']."', '".$theRow['e']."', '".$theRow['mp']."', '".$theRow['hp']."', '".$theRow['g']."', '".$theRow['dob']."', '".$theRow['tf']."', 0, '".$theRow['tf']."', 0, '".$theRow['jd']."', '".$theRow['da']."')";
$result10 = $db->query($query10);
$query11 = "INSERT INTO student_attending_class(class_id, student_id, waiting_list) VALUES ('".$max_c_idf."', '".$student_system_num."', '0')";
$result11 = $db->query($query11);
}
}
?>
什麼樣的價值觀呢$ student_res-> NUM_ROWS/$ student_num_results獲取循環中？它是否甚至高於0？ –
謝謝你的伴侶，是的，它的約700計數。 – olbanana