I’ve amended my post and instead of just the PHP if statement i’ve added PHP if else with a link to the PHP Manual.
Try this:
if ( is_single() )
{
echo ' singlular'
}else{
echo ' archive';
}
// or this IF AND ONLY THERE IS JUST A SINGLE STATEMENT
if ( is_single() )
echo ' singlular'
else
echo ' archive';
// or this method which I prefer because it is far easier than trying to find where curly brackets start and finish
if ( is_single() ) :
echo ' singlular'
else :
echo ' archive';
endif;
// or even this as a one-line
echo is_single() ? ' singlular' : ' archive';
Please consult the PHP Manual because if/else/endif are frequently used and should be mastered.