我们可以将字符串转换为php中的符号

Question

I'm trying to make a calculator in PHP now I have written a function in php to add few numbers but its concatenate instead of adding it can someone please help me guide me to do the task.

function cal($val1 , $opt , $val2){
  return $sum =  $val1 . $opt . $val2;
}

Now, if I'm calling this function like:

echo cal(4,"+",5);

It returns 4+5 but I'm looking 9 for an answer can it be possible that $opt works as an operator instead of a string and i can add or subtract based on operators like

Answer 1

You should do an if statement or a switch case one;

example

if ($opt =='+'){
   return $val1+$val2;
}else if($opt =='-'){ 
   return $val1-$val2;
} .... etc