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Editorial Team
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Asked: 2026-06-03T19:59:44+00:00

I have a database with member ID values. (always 8 digits long) If member

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I have a database with member ID values. (always 8 digits long)
If member is on the pay list there is a “SI” prefix added to the ID.

For example: 

John: 12345678

Jack: SI87654321

Now i would like to write a function which checks if there is “SI” at the beginning of the number. (Some kind of regular expression which extracts the “SI” from the number)

If yes -> return ID number (without SI), YES radio button is checked. (checked=”checked”)

If not -> return ID number, NO radio button is checked. (checked=”checked”)

example:

PHP:

$ID = get from database (for example: SI12345678)

function check () {return $pureNumber}

HTML:

<body>
<?php echo $pureNumber ?><br/>
<label for="dz1"><input type="radio" value="SI" name="davzav" id="dz1"/>YES(SI)</label>
<label for="dz2"><input type="radio" value="" name="davzav" id="dz1"/>NO</label>
</body>

Thanks for your help

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1 Answer

  1. Editorial Team

    You could just check the first two characters:

    if( substr($id,0,2) == "SI") {
    $is_si = true;
    $id = substr($id,2);
}
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