Run the Correct Array function based on a session variable php

Question

As a very novice php coder and beginner in web development i am in need of some advice and help, I have a calculation.php script that i am including into a landing page.. The script calculates a price depending on the user input value during the form process. Without making things to complicated and because i am going to try and run a dynamic landing page, The calculated price the script outputs can be different due to 2 different services we provide so service 1 is cheaper than service 2.

How can i go about having the array function run based if a session variable is equal to a specific value for example:

<?php
session_start();
if($_SESSION['service1'] == 'yes') {

Here is the Calculation.php script:

$data = array(
    array(
        'min' => "0",
        'max' => "100,000",
        'value' => 249
    ),
    array(
        'min' => "100,001",
        'max' => "200,000",
        'value' => 255
    )
);

function getAdjustedPrice($price, &$table) {
    $priceData = current(array_filter($table, function($value) use(&$price) {
        return $value['min'] <= $price && $value['max'] >= $price;
    }));
    return $priceData['value'];
}

$input = intval($_SESSION["servicecost"]);
printf("", 
       $input, 
       getAdjustedPrice($input, $data));

and if the session variable 1 is not set to yes but is set to "NO" then run the second variant of the calculation and then i will echo the output as variant number 2 is basically service 2 and is a higher price..

<?php
session_start();
if($_SESSION['service1'] == 'no') {

$data = array(
    array(
        'min' => "0",
        'max' => "100,000",
        'value' => 450
    ),
    array(
        'min' => "100,001",
        'max' => "200,000",
        'value' => 600
    )
);

function getAdjustedPrice($price, &$table) {
    $priceData = current(array_filter($table, function($value) use(&$price) {
        return $value['min'] <= $price && $value['max'] >= $price;
    }));
    return $priceData['value'];
}

$input = intval($_SESSION["servicecost"]);
printf("", 
       $input, 
       getAdjustedPrice($input, $data));

Hope this has made sense, Ive tried to do it myself using the elseif state and doing it like: if($_SESSION['service1'] == 'yes') { then run the code below it and then } else { if($_SESSION['service1'] == 'no') { but i have had no luck and constant silly errors. Any advice or input is greatly appreciated. Thanks.

Answer 1

If I understood correctly the following should do what you want:

<?php

session_start();

$service = $_SESSION['service1'] == 'yes'
           ? 'service1'
           : 'service2';


$data = array(

    'service1'=>array(
        array(
            'min' => "0",
            'max' => "100,000",
            'value' => 249
        ),
        array(
            'min' => "100,001",
            'max' => "200,000",
            'value' => 255
        )
    ),
    'service2'=>array(
        array(
            'min' => "0",
            'max' => "100,000",
            'value' => 450
        ),
        array(
            'min' => "100,001",
            'max' => "200,000",
            'value' => 600
        )
    )

);


function getAdjustedPrice($price, &$table)
{
    $priceData = current(array_filter($table, function($value) use(&$price) {
        return $value['min'] <= $price && $value['max'] >= $price;
    }));
    return $priceData['value'];
}

$input = intval($_SESSION["servicecost"]);

printf(
    "", 
    $input, 
    getAdjustedPrice($input, $data[ $service ])
);

Good luck!

EDIT: For a third service you will need to add the data to the array and check for the right value in your session, you can use a switch statement, the trick is assigning the right service, I guess you will need to store different values in your session $_SESSION['service1'].

So your code will now look something like :

<?php

session_start();

switch ($_SESSION['service1']) {
    case 'yes':
        $service = 'service1';
        break;
    case 'no':
        $service = 'service2';
        break;
    case '???????':
        $service = 'service3';
        break;
}


$data = array(

    'service1'=>array(
        array(
            'min' => "0",
            'max' => "100,000",
            'value' => 249
        ),
        array(
            'min' => "100,001",
            'max' => "200,000",
            'value' => 255
        )
    ),
    'service2'=>array(
        array(
            'min' => "0",
            'max' => "100,000",
            'value' => 450
        ),
        array(
            'min' => "100,001",
            'max' => "200,000",
            'value' => 600
        )
    ),
    'service3'=>array(
        array(
            'min' => "0",
            'max' => "100,000",
            'value' => 8888888888
        ),
        array(
            'min' => "100,001",
            'max' => "200,000",
            'value' => 9999999999
        )
    )

);


function getAdjustedPrice($price, &$table)
{
    $priceData = current(array_filter($table, function($value) use(&$price) {
        return $value['min'] <= $price && $value['max'] >= $price;
    }));
    return $priceData['value'];
}

$input = intval($_SESSION["servicecost"]);

printf(
    "", 
    $input, 
    getAdjustedPrice($input, $data[ $service ])
);