[wp-trac] [WordPress Trac] #63804: Proposal of wp_trim(): JavaScript-compatible alternative for trim()

[WordPress Trac]

#63804: Proposal of wp_trim(): JavaScript-compatible alternative for trim()
--------------------------+-----------------------------
 Reporter:  takayukister  |      Owner:  (none)
     Type:  enhancement   |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Formatting    |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 PHP's [https://www.php.net/manual/en/function.trim.php trim()] function,
 by default, only strips limited ASCII characters of whitespace. On the
 other hand, JavaScript's [https://developer.mozilla.org/en-
 US/docs/Web/JavaScript/Reference/Global_Objects/String/trim
 String.prototype.trim()] method strips all Unicode white space characters
 and line terminators. This difference often confuses.

 PHP 8.4 introduced [https://www.php.net/manual/en/function.mb-trim.php
 mb_trim()], the multi-byte safe alternative for `trim()`. Unfortunately,
 though, `String.prototype.trim()` and `mb_trim()` do not perform
 identically. There are slight differences: `String.prototype.trim()`
 strips `U+FEFF` (Zero-width no-break space); `mb_trim()` doesn't.

 For safe coding, I propose introducing `wp_trim()`, a PHP function that
 performs identically to `String.prototype.trim()`. The following is a
 simple implementation example of `wp_trim()`:

 {{{#!php
 function wp_trim( string $string ): string {
         $whitespaces =
 '\x09-\x0D\x20\x85\xA0\x{1680}\x{2000}-\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}\x{FEFF}';

         $string = preg_replace(
                 sprintf( '/[%s]+$/u', $whitespaces ),
                 '',
                 $string
         );

         $string = preg_replace(
                 sprintf( '/^[%s]+/u', $whitespaces ),
                 '',
                 $string
         );

         return $string;
 }
 }}}


 Among the white space characters that `wp_trim()` strips, `U+3000`
 (Ideographic space) is one especially often used in Japanese user-
 generated content. It is also called "full-width space", which is the
 character input when you hit the space bar in the Japanese input mode. I
 think we should replace `trim()` with `wp_trim()` anywhere you use it for
 trimming user input text.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/63804>
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