PHP 8.4 changed exit and die to functions, so this call has no effect. Instead you can redefine those functions to do nothing.<?phpfunction allow_exit( bool $allow ) { if ( PHP_VERSION_ID < 80400 ) { uopz_allow_exit( $allow ); } elseif ( $allow ) { uopz_unset_return( 'exit' ); uopz_unset_return( 'die' ); } else { uopz_set_return('exit', static function() {}); uopz_set_return('die', static function() {}); }}?>Test:<?phpecho "Calling die() with allow_exit(false)\n";allow_exit( false );die();echo "Calling die() with allow_exit(true)\n";allow_exit( true );die();echo "Unreachable\n";?>Calling die() with allow_exit(false)Calling die() with allow_exit(true)