php call constant with using a variable

Question

//include.php
    define('OPTION_0', 'Essence of population');
    define('OPTION_1', 'Passport request/extend');
    define('OPTION_2', 'Request logging concession');

//form.php
    <select name="sort">
        <option value="0"><?php echo(O_0) ?></option>
        <option value="1"><?php echo(O_1) ?></option>
        <option value="2"><?php echo(O_2 ?></option>
    </select>


//show.php
    extract($_POST);                    //The variable $sort has the value 1,2 or 3
    echo("This is your choice");
    echo(OPTION_ . $sort);              //I want to use de constant e.g. OPTION_2

I want to echo the value of the matching constant. So when I select the second value in form.php it gives $sort the value of 1 now I want to use the constants OPTION_1.

Can someone help me?

sort of voids the purpose of constants

Gerald Schneider
– Gerald Schneider

2014-02-18 08:25:27 +00:00
Commented Feb 18, 2014 at 8:25 — Gerald Schneider
– Gerald Schneider, Commented Feb 18, 2014 at 8:25

Pavel Štěrba · Accepted Answer · 2014-02-18 08:23:13Z

7

Just use constant() function:

echo constant('OPTION_' . $sort);

constant() is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function.

answered Feb 18, 2014 at 8:23

Pavel Štěrba

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