How would you use typecasting in PHP to convert a string to an integer?

How would you use typecasting in PHP to convert a string to an integer?

There is no typecasting in PHP

$val $=($int$)\text{'}47\mathrm{.}5\text{'}$; $//$ The result would be $47$

$val $=$ round$(55\mathrm{.}2)$; $//$ The result would be $55$

$val $=$ int$(45\mathrm{.}9)$; $//$ The result would be $45$f