3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "foo"; var_dump($a[7] = "abc"); var_dump($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Only the first byte will be assigned to the string offset in /in/eTTk7 on line 3 string(1) "a" string(8) "foo a"
Output for 5.2.6 - 5.2.9, 5.2.12 - 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, 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
string(1) "a" string(8) "foo a"
Output for 5.2.10 - 5.2.11
Notice: Uninitialized string offset: 7 in /in/eTTk7 on line 3 string(1) "a" string(8) "foo a"
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.5
string(3) "abc" string(8) "foo a"
Output for 4.3.0 - 4.3.2
NULL string(8) "foo a"

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