Dynamic select array in PHP

Question

I have a standard form array in PHP like this. I need to account for up to 10 hours of labor in 15 minute increments with 10 as a value for every 15 min or 40 per hour. Is it possible to automate this into some sort of array with PHP instead of hardcoding each of these values? It just seems like there should be a better way and I have no idea how to start?

<select size="1" name="labor" id="labor">
    <option value="80">2 Hours</option>
    <option value="70">1 Hour 45 min.</option>
    <option value="60">1 Hour 30 min.</option>
    <option value="50">1 Hour 15 min.</option>
    <option value="40">1 Hour</option>
    <option value="30">45 Minutes</option>
    <option value="20">30 Minutes</option>
    <option value="10">15 Minutes</option>
</select>

Unless you are seeing increments changing al the time (10 minutes, 5 minutes, etc.), you are aware that hardcoding this is fine, and faster the rerererecalculating this with PHP all the time? You could of course generate the list once with some PHP code, and leave that code as a comment near there for someone to quickly grab to recreate the list with slightly different variables in a year or so, after which it once again stays static. — Wrikken
– Wrikken, Commented Jun 25, 2012 at 21:17

David Cheung · Accepted Answer · 2012-06-25 21:27:57Z

3

Probably easiest to hardcode the solution. I think this is one of those situations where it is OK as @Wrikken mentioned, as it makes the code very clean and easy to maintain (Imagine coming back to this in a year or two). In addition this situation can also be handled very well with a database table.

First use an array to store you values and descriptions:

$list = array();
$list['10'] = '15 Minutes';
....

Then loop through the entire array to generate your dropdown:

<select size="1" name="labor" id="labor">
<?php
   foreach($list as $value => $desc){
     $option = "<option value=$value>" . $desc . "</option>";
     echo $option;
   }
?>
</select>

edited Jun 25, 2012 at 21:27

answered Jun 25, 2012 at 21:22

David Cheung

8584 silver badges8 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Rocco The Taco Over a year ago

I went with the hard code, I can easily change the options at a later date even without the array. Makes sense. Thanks for the help!

Emil Vikström · Accepted Answer · 2012-06-25 21:09:34Z

2

You need two values, the 10-units increment and the user-displayed value. Run a for loop over $i (or some other variable) from 1 to 40 and calculate your values inside the loop:

10-increment is easy, just multiply $i by ten.
For the displayed value, multiply by 15 to get the total amount of minutes. Then transform that into hours and minutes using the modulo operator (which gives you the minutes) and standard divison (to get the hours).

answered Jun 25, 2012 at 21:09

Emil Vikström

92.3k17 gold badges144 silver badges178 bronze badges

Comments

score 1 · Accepted Answer · 2012-06-25 21:29:11Z

1

This should do it. Change the start number of $i to how many total minutes the dropdown should contain. It´s now set to 750 minutes.

echo '<select>';
for ($i = 750; $i >= 15; $i -= 15) {

    $hours = $i / 60;
    $min = $i % 60;

    echo '<option>';

    if ($hours >= 1)
        echo floor($hours)." Hours ";

    if ($min > 1) 
        echo $min." Minutes";

    echo '</option>';
}
echo '</select>';

NOTE: This code is not perfect, the start number needs to be evenly divided with 15 to generate your desired result, (however, it works).

edited Jun 25, 2012 at 21:29

answered Jun 25, 2012 at 21:24

user1043994

1 Comment

Frederick Behrends Over a year ago

use floor() not round()

sachleen · Accepted Answer · 2012-06-25 21:49:12Z

0

Something like:

<select size="1" name="labor" id="labor">
<?php 
for ($x = 1; $x < 11; $x++) {
    echo '<option value="';
    echo $x*10;
    echo '">';
    echo $x*15;
    echo " Minutes</option>";
}
?>
</select>

Throw in an if statement there to seperate it so that once (x/10*15)>60 it starts carrying over into hours instead of having 75/90/105/120 minutes.

edited Jun 25, 2012 at 21:49

sachleen

31.2k8 gold badges81 silver badges75 bronze badges

answered Jun 25, 2012 at 21:09

Sturm

4,2853 gold badges26 silver badges39 bronze badges

Collectives™ on Stack Overflow

Dynamic select array in PHP

4 Answers 4

1 Comment

Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

1 Comment

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related