Hidden Features of PHP? [closed]

Answer 1

Probably not many know that it is possible to specify constant "variables" as default values for function parameters:

function myFunc($param1, $param2 = MY_CONST)
{
//code...
}

Strings can be used as if they were arrays:

$str = 'hell o World';
echo $str; //outputs: "hell o World"

$str[0] = 'H';
echo $str; //outputs: "Hell o World"

$str[4] = null;
echo $str; //outputs: "Hello World"