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<?php function func(&$data) { foreach ($data as $key => $value) { if (is_array($value)) { func($data[$key]); } } } $data = [ ['zero' => [0]], ['one' => [1]], ]; debug_zval_dump($data); //refcount=2 for ($i = 0; $i < 10000; $i++) func($data); debug_zval_dump($data); //refcount=3
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
array(2) refcount(3){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(1){ [0]=> int(0) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(1){ [0]=> int(1) } } } array(2) refcount(2){ [0]=> reference refcount(1) { array(1) refcount(1){ ["zero"]=> reference refcount(1) { array(1) refcount(2){ [0]=> int(0) } } } } [1]=> reference refcount(1) { array(1) refcount(1){ ["one"]=> reference refcount(1) { array(1) refcount(2){ [0]=> int(1) } } } } }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array(2) refcount(3){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(1){ [0]=> int(0) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(1){ [0]=> int(1) } } } array(2) refcount(2){ [0]=> reference refcount(1) { array(1) refcount(1){ ["zero"]=> reference refcount(1) { array(1) refcount(2){ [0]=> int(0) } } } } [1]=> reference refcount(1) { array(1) refcount(1){ ["one"]=> reference refcount(1) { array(1) refcount(2){ [0]=> int(1) } } } } }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
array(2) refcount(3){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(1){ [0]=> int(0) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(1){ [0]=> int(1) } } } array(2) refcount(2){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(2){ [0]=> int(0) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(2){ [0]=> int(1) } } }
Output for 7.0.0 - 7.0.33
array(2) refcount(2){ [0]=> array(1) refcount(2){ ["zero"]=> array(1) refcount(1){ [0]=> int(0) } } [1]=> array(1) refcount(2){ ["one"]=> array(1) refcount(1){ [0]=> int(1) } } } array(2) refcount(2){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(2){ [0]=> int(0) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(2){ [0]=> int(1) } } }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
array(2) refcount(2){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(1){ [0]=> long(0) refcount(1) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(1){ [0]=> long(1) refcount(1) } } } array(2) refcount(2){ [0]=> array(1) refcount(1){ ["zero"]=> array(1) refcount(1){ [0]=> long(0) refcount(1) } } [1]=> array(1) refcount(1){ ["one"]=> array(1) refcount(1){ [0]=> long(1) refcount(1) } } }

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