Description:
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Trying to access the index of an integer is not a well-defined operation IMO, having no reasonable meaning. In practice in PHP, it seems to simply return null in all cases.

I accidentally accessed an integer which I thought was a string. Because no error was returned it took me some time to track down the problem.

Therefore, I suggest that trying to access an index on an integer should throw an E_NOTICE or E_WARNING.

Reproduce code:
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error_reporting(E_ALL | E_STRICT);

$a = 1234;
//This will print "", with no error raised.
echo '"'.$a[0].'"';



Expected result:
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An E_NOTICE or E_WARNING.

Actual result:
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No error raised