php type conversion

Using type conversion, you can convert the value of a variable to another type. This conversion is the same as the type conversion in C language. Just insert the temporary data type you want to convert in parentheses before the variable you want to type convert.
For example:

The second line of code means "take out the variable value stored in $totalqty, interpret it as a floating point type, and save it in $totalamount". The $totalamount variable will become a floating point type. The converted variable does not change its type, so $totalqty is still an integer type.