Bug #76950 [Nab]: trim not working

Edit report at https://bugs.php.net/bug.php?id=76950&edit=1 ID: 76950 User updated by: tobias at tromm dot no-ip dot org Reported by: tobias at tromm dot no-ip dot org Summary: trim not working Status: Not a bug Type: Bug Package: *General Issues Operating System: Windows Server 2016 PHP Version: 7.2.10 Block user comment: N Private report: N New Comment: Thank you alot @requinix for the explanation. Maybe in the future php could have a function to remove all non-breaking space if that's possible. Thank you again. Previous Comments: ------------------------------------------------------------------------ [2018-09-29 21:29:15] requinix@php.net You probably need the longer explanation. Welcome to the world of character encodings. Nearly all of PHP's normal functions work on bytes. You are thinking about characters. Since PHP doesn't internally manage Unicode characters, the only reasonable way PHP can currently convert between the two is look at the byte ranges that all ("all") character encodings can agree upon: the 0-126 range. That means functions like trim will only deal with the bytes \n\r\t\v and space, and \0 for the fun of it, and they will not cover anything above \x7F. Those bytes blocking trim from reducing the entire string to "David" are above \x7F. The exact interpretation of what characters those bytes are depends on the character encoding. In Latin1, \xA0 (\240) is a non-breaking space, but in UTF-8 it is not a character at all - instead it is part of a 2-4 byte sequence that represents a character (and the sequence for a non-breaking space is \xC2\xA0 or \302\240). There is no mb_trim function but you can use pcre_replace with \s and the /u option. ------------------------------------------------------------------------ [2018-09-29 20:59:09] requinix@php.net Yes, it was converted. But for next time, familiarize yourself with functions like addcslashes so that code CAN be copied and pasted. $apelido = " \302\240 \302\240 \302\240 \302\240 \302\240 David \302\240 \302\240 \302\240 \302\240 \302\240 "; The documentation for rtrim explicitly states what characters are trimmed by default. If you don't like that list then provide your own. ------------------------------------------------------------------------ [2018-09-29 20:56:28] tobias at tromm dot no-ip dot org PLEASE DONT COPY THESE CODE, IT WILL CHANGE THE RESULT COMPLETELY!!! I just copy it and paste on my php editor and the result will change. Use the zip file from the link I provide. Otherwise, the space char will be converted! ------------------------------------------------------------------------ [2018-09-29 20:53:40] requinix@php.net <?php $apelido = "           David           "; echo "Given String: \"".$apelido."\"<br><br>"; echo "Given String with the use of php trim function: \"".trim($apelido)."\"<br><br>"; echo "Now we will check the ASCII table to check wich character are being used:<br><br>"; for ($cont=0; $cont <strlen($apelido); $cont++){ echo "ORD: ".ord($apelido[$cont])."<br>"; } $fazer = 1; do { $fazer = 0; //Check the beginning of the string if ($apelido[0] == chr(32) OR $apelido[0] == chr(194) OR $apelido[0] == chr(160)) { $fazer = 1; $apelido = ltrim($apelido, chr(32)); $apelido = ltrim($apelido, chr(194)); $apelido = ltrim($apelido, chr(160)); } //Check the end of the string if ($apelido[strlen($apelido)-1] == chr(32) OR $apelido[strlen($apelido)-1] == chr(194) OR $apelido[strlen($apelido)-1] == chr(160)) { $fazer = 1; $apelido = rtrim($apelido, chr(32)); $apelido = rtrim($apelido, chr(194)); $apelido = rtrim($apelido, chr(160)); } } while ($fazer == 1); echo "<br>Result String: \"".$apelido."\"<br><br>"; ?> ------------------------------------------------------------------------ [2018-09-29 20:52:00] tobias at tromm dot no-ip dot org I am afraid that if I copy the script here the characters will be converted and the result will change. Thas why I provide you a zip. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=76950 -- Edit this bug report at https://bugs.php.net/bug.php?id=76950&edit=1