array_filter doesn't seems to work for words having apostrophe and dash

Question

I have a php code as shown below:

$variable = \\CTIME\\DataPoint\\get_message();  // Line A
echo \'
\'; print_r($variable); echo \         


        

Answer 1

You have an encoding mismatch, and I will wager that it's between UTF-8 and MS cp1252.

cp1252 is a single-byte encoding that Microsoft uses, and is frequently confused with ISO8859-1. While many of the codepoints map to the same glyphs in both, there are some notable differences like ’ that give it away as it only occurs in cp1252.

If you look at the byte values of strings you'll see:

• cp1252: \x92
• UTF-8: \xE2\x80\x99

Which is why you're having trouble matching.

You're going to want to make this post your new religion: UTF-8 all the way through

Without re-hashing that gospel truth, my over-arching recommendations on dealing with character encodings are:

1. Never assume a character encoding, always set it explicitly.
2. Never attempt to detect a character encoding, as it is virtually impossible to do with any level of accuracy.
3. Never use utf8_encode() or utf8_decode().
   • They will only ever convert between ISO8859-1 and UTF-8.
   • They do not make any attempt to check if the input is the encoding they expect. [see point 2]
   • Even when they encounter an detectably invalid byte sequence they do not make any attempt to care and will simple introduce trash into the output.
4. Always use functions like mb_convert_encoding() or iconv(), and always specify both the input and output encodings. [see point 1]