How to get the first two numbers in an integral?

How to get the first two 开发者_Python百科numbers in an integral?

For example: get 12 of the 123456 in PHP or JavaScript?

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PHP:

$num = 123456;
echo substr($num, 0, 2);

JavaScript:

alert((123456).toString().substr(0, 2));

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JavaScript:

(123456).toString().substr(0,2);

PHP:

substr(123456, 0, 2);

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$result = substr("123456", 0, 2);

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Numerically in Javascript:

while (number >= 100) number = Math.floor(number / 10);