>> print $a[0];   // prints 5
>> print $a[100]; // Notice: Uninitialized string offset:  100
Yup, this should happen when 5 is treated as an array of characters.
In other words as a string.
$a = '5';
echo $a[0];
echo $a[100];
gives you the expected result

regarding the original question, i think that the interpreter is
prefilling the variable with null

$a = 5;
var_dump(isset($a[0]));
var_dump($a[0]);

since $a[0] is already assigned (to null) the interpreter is not
throwing a notice

$b = null;
var_dump(isset($b));
var_dump($b);

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