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I want to ask how can I perform mathematics calculations with 2 random numbers ($a, $b). Im using $c as random number to clarify which mathematical symbol to use.

$a = mt_rand(1,1000); $b = mt_rand(1,1000); $c = mt_rand(1,1000); if ($c < 100) { $math = "/"; } else if ($c > 900) { $math = "*"; } else if (500 < $c && $c < 900) { $math = "-"; } else { $math = "+"; } $calculate = "$a $math $b"; echo $calculate; // provide mathematical task to user echo "<br />"; $result = $a "$math" $b; // trying to calculate result echo $result;

My question is how hould I use "$math" variable to clarify mathematical symbol? Thanks for the help.

Example:

$a = 1; $b = 2; $math = "*";

Result is "1 * 2"

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  • Have you tried excluding the double quotes around $math in the second to last statement and concatenating, e.g. $result = $a.$math.$b; Commented Sep 11, 2015 at 16:44
  • @Craig Yes, it returns as string. Commented Sep 11, 2015 at 16:47

1 Answer 1

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To calculate the result, you can use eval() by changing these lines:

$result = $a "$math" $b; // trying to calculate result echo $result;

to:

$calculatePHP = '$result = ('.$a.$math.$b.');'; eval($calculatePHP); echo $result;
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