Coding standards
Security in ResourceSpace
Developer reference
Database
Action functions
Admin functions
Ajax functions
Annotation functions
API functions
Collections functions
Comment functions
Config functions
CSV export functions
Dash functions
Debug functions
Encryption functions
Facial recognition functions
File functions
General functions
Language functions
Log functions
Login functions
Message functions
Migration functions
Node functions
PDF functions
Plugin functions
Render functions
Reporting functions
Request functions
Research functions
Slideshow functions
Theme permission functions
User functions
Video functions
Database functions
Metadata functions
Resource functions
Search functions
Map functions
Job functions
Tab functions
Test functions

allow_unicode_characters()

Description

Strip any characters not present in the allow list. Mostly useful for search/indexing purposes where we care more
about the words themselves and less about linking or any other type of characters.

Parameters

ColumnTypeDefaultDescription
$text string Initial text value
$allowlist list []: string { // Regex explanation - match a single character not present in the list below: // \p{L} - any kind of letter from any language // \p{N} - any kind of numeric character in any script // \s - any kind of invisible character equivalent to [\p{Z}\h\v] return trim_spaces preg_replace'/[^\p{L}\p{N}\s' . implode'' List of allowed characters. IMPORTANT: it's used to create a regex pattern.
array_mappreg_quote...
. $allowlist
''
$text

This article was last updated 9th January 2026 08:35 Europe/London time based on the source file dated 8th January 2026 16:00 Europe/London time.