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<?php $string = 'Hello World!'; var_dump($string); $string[5] = null; var_dump($string);
Output for 7.1.0
string(12) "Hello World!" Warning: Cannot assign an empty string to a string offset in /in/tmB0e on line 4 string(12) "Hello World!"
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
string(12) "Hello World!" string(12) "HelloWorld!"