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<?php function &foo(&$param) { $param = 42; return $param; } $a = 23; echo "\$a before calling foo(): $a\n"; $b = foo($a); echo "\$a after the call to foo(): $a\n"; $b = 23; echo "\$a after touching the returned variable: $a\n"; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
$a before calling foo(): 23 $a after the call to foo(): 42 $a after touching the returned variable: 42