Lucas_Werkmeister_WMDE added a comment.
It’s also curious that “Cannot pass parameter 1 by reference” is not the
standard error message for calling a reference-parameter function with a
non-referenceable argument, as far as I can tell. So far I’ve only managed to
make PHP print that message with a lambda:
lucaswerkmeister-wmde@mw1281:~$ php --version
PHP 7.2.31-1+0~20200514.41+debian9~1.gbpe2a56b+wmf1+icu63 (cli) (built: Oct
12 2020 09:43:06) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache
v7.2.31-1+0~20200514.41+debian9~1.gbpe2a56b+wmf1+icu63, Copyright (c)
1999-2018, by Zend Technologies
lucaswerkmeister-wmde@mw1281:~$ php -a
Interactive mode enabled
php > explode( ':', 'a:b:c' );
php > function f( &$ref ) {}
php > f( ':' );
Fatal error: Only variables can be passed by reference in php shell code on
line 1
php > ('f')( ':' );
Fatal error: Only variables can be passed by reference in php shell code on
line 1
php > $l = function ( &$ref ) {};
php > $l( ':' );
Warning: Uncaught Error: Cannot pass parameter 1 by reference in php shell
code:1
Stack trace:
#0 {main}
thrown in php shell code on line 1
I’m not sure if that’s significant.
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