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So what classes did you put #[\AllowDynamicProperties] on
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Here are two classes you need to put it on. Others are mostly static
classes so the properties are already decleared.

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CObject
public_html/mod/main/v3.00/mod/base/CObject.class.php
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CSRouter
public_html/include/CSRouter.class.php
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CMailFunc
public_html/mod/main/v3.00/mod/sform/include/CMailFunc.class.php
	private $mime_boundary_mix;
	private $mime_boundary_alt;
	private $spec;
	private $lx;
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Fix `Online Link Obfuscator`
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As already mentioned, most sample PHP applications use `error_reporting( 0 )`
to suppress "Creation of dynamic property (property name) is deprecated"
because they are old and not worth to edit files.
While `Online Link Obfuscator` is fairly new and so
you should spend time to fix the error by really declaring the properties
instead of `error_reporting( 0 )` / #[\AllowDynamicProperties]

Most of classes are static so they don't have to be edited.
Here are the file that must be edited:
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public_html/mod/LNOBF/v1.00/codegen/include/CVFunc.class.php

class CVFunc{
	private $strx;
	private $str_min;
	private $str_max;
	private $rdict_sort;
	private $rdict_rand;
	private $mapping;
	private $db;
	private $code_shift;
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public_html/mod/LNOBF/v1.00/codegen/include/CKFunc.class.php

class CKFunc{
	private $str_max;
	private $str_min;
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public_html/mod/LNOBF/v1.00/codegen/include/CIdenObf.class.php

class CIdenObf{
	private $str_min;
	private $str_max;
	private $rdict_rand;
	private $list_dollar;
	private $list_atstring;
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Fix Help File
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Add `#[\AllowDynamicProperties]` to those two classes:
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public_html/mod/XXXXX/v0.00/mod/base/CObject.class.php
public_html/mod/XXXXX/v0.00/mod/base/CApp.class.php
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[X] SNTQK
[X] NFSRL
[X] DCAET
[X] FISLS
[X] TAGAX
[X] APDBV
[X] APQDX
[X] APADM
[X] ALNJX
[X] APSMX
[X] HOBFP
[X] SUMCX
[X] ETOBF
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Mail Test (PHP v8.3 didn't affect mailing)
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