Question

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How to make a calculator in PHP?

I got the string like 5*100/4 , and I need to make a math statement from this…Simply put, when this is is the input, output should be 125. Does anyone know any simple way to achieve this? I tried
$input = "5*100/4";
eval('$output = '.$input.';');
but that doesn´t work for some reason… Any advices?

Answer 1

Try this:

$math = '5*100/4';
$result = eval( "return ${math};" );
printf("%s = %s\n", $math, $result);

would produce

5*100/4 = 125

NOTE: eval() is dangerous if your not going to put extreme care to what you pass to it.