A numeric string as array key in PHP

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No; no it’s not:

From the manual:

A key may be either an integer or a string. If a key is the standard representation of an integer, it will be interpreted as such (i.e. “8” will be interpreted as 8, while “08” will be interpreted as “08”).

Addendum

Because of the comments below, I thought it would be fun to point out that the behaviour is similar but not identical to JavaScript object keys.

foo = { '10' : 'bar' };

foo['10']; // "bar"
foo[10]; // "bar"
foo[012]; // "bar"
foo['012']; // undefined!

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