You can use str_replace(), which is defined as:
str_replace($search, $replace, $subject)
So you could write the code as:
$subject = 'REGISTER 11223344 here' ;
$search = '11223344' ;
$trimmed = str_replace($search, '', $subject) ;
echo $trimmed ;
منبع اصلی . اطلاعات بیشتر در : https://2ad.ir/wcGm61L