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<?php function test($var) { //$var = 3; echo $var; debug_zval_dump($var); } $a = 0; debug_zval_dump($a); test($a); debug_zval_dump($a);
Output for 7.0.0 - 7.1.0
int(0) 0int(0) int(0)
Output for hhvm-3.10.0 - 3.12.0
long(0) refcount(1) 0long(0) refcount(1) long(0) refcount(1)
Output for 4.3.0 - 5.6.28
long(0) refcount(2) 0long(0) refcount(4) long(0) refcount(2)