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run code in 300+ PHP versions simultaneously
<?php $var1 = 'ccc'; $var2 = $var1; debug_zval_dump($var1, $var2); echo "===========\n"; $var2 .= 'xxx'; debug_zval_dump($var1, $var2);
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(3) "ccc" interned string(3) "ccc" interned =========== string(3) "ccc" interned string(6) "cccxxx" refcount(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
string(3) "ccc" refcount(1) string(3) "ccc" refcount(1) =========== string(3) "ccc" refcount(1) string(6) "cccxxx" refcount(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
string(3) "ccc" refcount(4) string(3) "ccc" refcount(4) =========== string(3) "ccc" refcount(2) string(6) "cccxxx" refcount(2)
preferences:
309.31 ms | 404 KiB | 456 Q