how to convert string to double in php without using doubleval function?

Question

I have a string value $a=10. I have to convert to double value before storing. how to convert string to double in php.

I tried adding 0.00 to the $a. i.e $a= $a+0.00; But it doesn't work

Answer 1

Just use this

   $a = 10;
   echo number_format($a, 2);