Too Long; Didn't Read
The hidden characters don't even show up in text editors like nano! They are called zero-width-space-space characters. They have special powers of invisibility. We can then hide any message in plain text by splitting it into single characters. The best practice is to add the spaces between words in the spaces. Otherwise spellcheckers tend to think the word is misspelled. Convert a string into binary data using PHP to binary and vice versa. Convert the ones, zeros, and spaces of the hidden binary data to their respective hidden binary characters.