PHP - 如何仅在循环中发布选中的复选框？

Question

I am working on a project that signs up students to specific classes("french", "math",...). The student id is already selected. True a while loop i display my classes out of my database with a checkbox in front of each class. I only wanna post te checked checkboxes in a form that will send it to a php file thats puts the student and his selected classes into the database. But i cant seem to solve how i only post the checked checkboxes because of the difficulty with the while loop. I hope someone can help me. Already thanks!

Answer 1

The best way would probably be to alter your HTML to POST the classes as an array instead of individual form elements.

<checkbox name="classes[]" value="CLASS_ID_1">
<checkbox name="classes[]" value="CLASS_ID_2">
<checkbox name="classes[]" value="CLASS_ID_3">
<checkbox name="classes[]" value="CLASS_ID_4">

Then, the PHP side of this is very easy. Only the checked checkbox values will appear on the processing page.

So, let's say that someone checks CLASS_ID_1, CLASS_ID_3 and CLASS_ID_4;

print_r($_POST['classes']);

The above code should return;

array (
    "CLASS_ID_1",
    "CLASS_ID_3",
    "CLASS_ID_4"
)

So, essentially, it is an array of checked values. This means you do not need the class name or any additional information or loops to process the data.