PHP: Determining if substring is in position zero.

PHP

$var="Duis posuere nunc sit amet sapien pharetra, at scelerisque risus fringilla. Aenean sed purus nec quam ullamcorper aliquam.";




function sub1($var,$sub){
   if(strpos($var,$sub) === 0){ // use identity operator because false is also equal to 0
     echo "<p>".str_pad($sub,25,".").str_pad(" is in position zero",25,".",STR_PAD_LEFT)."</p>";
   }
   else{
     echo "<p>".str_pad($sub,25,".").str_pad(" is not in position zero",25,".",STR_PAD_LEFT)."</p>";
   }
}




sub1($var,'scelerisque');

sub1($var,'Duis');

//Result

scelerisque............... is not in position zero

Duis.......................... is in position zero