Editing via function call PHP - php

Question

I am wrapping functions in php pages in the functions.php and to access these pages, i put an action and a value in the url. I also have a function_calls.php which requests the action and its value and passes it to a switch case which calls the appropriate function. The problem i have is that i case i want to edit a field . I dont have an appropriate case(for the switch) which i want to look something like admin.php?action=edit?id=some_id.
function_calls.php
<?php
require_once "functions.php";
if (isset($_REQUEST['action'])) {
$option = $_REQUEST['action'];
echo $option;
switch ($option) {
case "complaints":
complaint();
break;
case "users":
users();
break;
case "officers":
officers();
break;
case "register_officer":
register_officer();
break;
case "register_student":
register_student();
break;
case "add_event":
add_event();
break;
default:
complaint();
break;
}
} else {
echo '<div class="jumbotron">
<h1>Welcome To The Administration Panel </h1>
<p>You can manage accounts and view the complaints here.</p>
</div>';
}
functions.php
<?php
include_once "include/db_connect.php";
function register_student()
{
?>
<section>
<div class="row">
<div class="col-md-7 col-md-offset-1">
<form class="" method="post" action="">
<div class="row">
<div class="col-md-6 ">
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Firstname" name="firstname" required=""
class="form-control">
</div>
</div>
<div class="col-md-6">
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Lastname" name="lasttname" required=""
class="form-control">
</div>
</div>
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-envelope"></i></span>
<input type="text" placeholder="Email" name="email" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Registration Number" name="reg_no" required=""
class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-phone"></i></span>
<input type="text" placeholder="Phone" name="phone" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" placeholder="Password" name="password" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" placeholder="Confirm Password" name="conf_password" required=""
class="form-control">
</div>
<div class="row">
<!--<div class="col-md-6 checkbox">
<label><input type="checkbox">Remember me</label>
</div>-->
<div class="col-md-12">
<button class="btn btn-success btn-block pull-right" type="submit" name="register">Register
Student
</button>
</div>
</div>
</form>
</div>
</div>
</section>
<?php
}
function register_officer()
{
?>
<section>
<div class="row">
<div class="col-md-7 col-md-offset-1">
<form class="" method="post" action="register.php">
<div class="row">
<div class="col-md-6 ">
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Firstname" name="firstname" required=""
class="form-control">
</div>
</div>
<div class="col-md-6">
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Lastname" name="lastname" required=""
class="form-control">
</div>
</div>
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-envelope"></i></span>
<input type="text" placeholder="Email" name="email" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-user"></i></span>
<input type="text" placeholder="Rank" name="rank" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-phone"></i></span>
<input type="text" placeholder="Phone" name="phone" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" placeholder="Password" name="password" required="" class="form-control">
</div>
<div class="input-group margin-bottom-20">
<span class="input-group-addon"><i class="fa fa-lock"></i></span>
<input type="password" placeholder="Confirm Password" name="conf_password" required=""
class="form-control">
</div>
<div class="row">
<!--<div class="col-md-6 checkbox">
<label><input type="checkbox">Remember me</label>
</div>-->
<div class="col-md-12">
<button class="btn btn-success btn-block pull-right" type="submit" name="register_officer">
Register Officer
</button>
</div>
</div>
</form>
</div>
</div>
</section>
<?php
}

Answer 1

This would be a bit more elegant solution than yours:
<?php
require_once 'functions.php';
if (isset($_GET['action'])) {
$option = $_GET['action'];
echo $option;
if(in_array($option, get_defined_functions()['user']) === true) {
call_user_func($option);
} else {
complaint();
}
} else {
echo '<div class="jumbotron">
<h1>Welcome To The Administration Panel </h1>
<p>You can manage accounts and view the complaints here.</p>
</div>';
}
So then you can define a function edit() which will be automatically called by the call_user_func without altering the switch each time you add a new function.