Никита Хворостенко

function func(string $strStart, string $strEnd) : bool
{
   $strStartChars  = str_split($strStart);
   $strEndChars    = str_split($strEnd);
   $strStartChars  = array_diff($strStartChars,    [' ']);
   $strEndChars    = array_diff($strEndChars,      [' ']);

   foreach( $strEndChars as $char )
      if( in_array($char, $strStartChars) )
         unset($strStartChars[array_search($char, $strStartChars)]);

   return count($strStartChars) == 0;
}