String offsets are full of oddities :
$str = "abc";
$str{0} = '';
var_dump($str); // -> string(3) "bc" (read as "\0bc")
Assigning an empty string to a string offset inserts a null byte because
the string length is not checked in zend_assign_to_string_offset().
I see this as a bug. IMO, this case should raise a warning and the
string should remain unchanged.
Thoughts before I register a bug and a PR ?
Regards
François
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