Math calculation inside input forms

PHP
1

I try to make math calculation which is not visible to the user or robots.
How to make working mathematical formulas?
The object math_validation uses parameters calcsettings with an array value like minimum, maximum and calculation method.

<?php

function math_validation( $calcsettings ) {
Math settings
        array(
            'min' => 1,
            'max' => 15,
            'cal' => array( '+', '*' ),
        );

 
    $calcsettings['max'] = 5;
 
    return $calcsettings;
}

?>
2

Without having the code around this, it’s impossible to say.

3

works as expected

<?php

function math_validation( $calcsettings ) {


 
    $calcsettings['max'] = 5;
 
    return $calcsettings;
}


$calcsetting = array(
            'min' => 1,
            'max' => 15,
            'cal' => array( '+', '*' ),
        );

print_r(math_validation($calcsetting));

/*
Array
(
    [min] => 1
    [max] => 5
    [cal] => Array
        (
            [0] => +
            [1] => *
        )

)
4

As we have now array values and mathematical calculation, how to bring values into input cell like:
3*5 = 15
1+4 = 5
Result:

Array
(
    [min] => 1
    [max] => 5
    [cal] => Array
        (
            [0] => +
            [1] => *
        )

)

Should be used JavaScript due to this response math_val? I have added onFocus=“mathcalculation()” which can be used for JavaScript.
HTML:

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="content-type" content="text/html" />

<title>Math validation</title>
</head>

<body>
<form id="form-validation1" class="form-validation1" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">

<input type="hidden" data-math="" name="" class="form-control" placeholder="" readonly />
<input type="hidden" data-math="" name="" class="form-control" placeholder="" readonly />

<input id="math_val" onFocus="mathcalculation()" type="number" name="math_val" maxlength="2" class="form-control" placeholder="Enter result like 2 + 5 = 10" />

</form>

</body>
</html>
5

This topic was automatically closed 91 days after the last reply. New replies are no longer allowed.