function concatenate_replace($str) {
$str = str_replace("geared", "", str_replace("general", "GENERAL", substr($str, 4)));
return $str;
}
$str = "PHP is a general-purpose scripting language geared towards web developmen";
$str = concatenate_replace($str);
echo $str;
/*
run:
is a GENERAL-purpose scripting language towards web developmen
*/