How does HTMLPurifier set the character Filter whitelist?

uses HTMLPurifier to Filter a url, in the text but converts a parameter in url, lang, into a full-width less-than sign (similar to <, but full-width).
after reading the document, it seems that there is no such function. Has any of your peers encountered a similar situation?

Xss html htmlpurifier php
Apr.07,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e610ce-45908.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e610ce-45908.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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