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run code in 300+ PHP versions simultaneously
<?php $a[0] = 1; echo '$a: '; debug_zval_dump($a); $b =& $a[0]; echo "=============\n"; echo '$a: '; debug_zval_dump($a); echo '$b: '; debug_zval_dump($b); $c = $a; echo "=============\n"; echo '$a: '; debug_zval_dump($a); echo '$c: '; debug_zval_dump($c); $c[0] = 2; echo "=============\n"; echo '$a: '; debug_zval_dump($a); echo '$c: '; debug_zval_dump($c);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
$a: array(1) refcount(2){ [0]=> int(1) } ============= $a: array(1) refcount(2){ [0]=> reference refcount(2) { int(1) } } $b: int(1) ============= $a: array(1) refcount(3){ [0]=> reference refcount(2) { int(1) } } $c: array(1) refcount(3){ [0]=> reference refcount(2) { int(1) } } ============= $a: array(1) refcount(2){ [0]=> reference refcount(3) { int(2) } } $c: array(1) refcount(2){ [0]=> reference refcount(3) { int(2) } }
Output for 7.0.0 - 7.0.33, 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
$a: array(1) refcount(2){ [0]=> int(1) } ============= $a: array(1) refcount(2){ [0]=> &int(1) } $b: int(1) ============= $a: array(1) refcount(3){ [0]=> &int(1) } $c: array(1) refcount(3){ [0]=> &int(1) } ============= $a: array(1) refcount(2){ [0]=> &int(2) } $c: array(1) refcount(2){ [0]=> &int(2) }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
$a: array(1) refcount(2){ [0]=> long(1) refcount(1) } ============= $a: array(1) refcount(2){ [0]=> &long(1) refcount(2) } $b: long(1) refcount(1) ============= $a: array(1) refcount(3){ [0]=> &long(1) refcount(2) } $c: array(1) refcount(3){ [0]=> &long(1) refcount(2) } ============= $a: array(1) refcount(2){ [0]=> &long(2) refcount(3) } $c: array(1) refcount(2){ [0]=> &long(2) refcount(3) }
preferences:
287.35 ms | 404 KiB | 459 Q