PHP - A condition into a condition

[Scanu]

Hi everywone is me again, I have this condition

PHP Code:

if (condition1 OR condition2)
{
Do some php code
} 


I want to add "or condition2" just if(condition3)
This is the best that i can do for let you understand
Here the code that i've supposed and tried (give me this error: unexpected T_CONSTANT_ENCAPSED_STRING)

PHP Code:

if (condition1 '. if (condition3){ OR condition2}.')
{
Do some php code
} 


hope that you understand what i mean