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help with multidimentional arrays

in PHP_MySQL_JavaScript_CSS second edition.
you talk of arrays on page 45... please can someone explain how you calculate this matrix...

$oxo = array(array('x', '', 'o'),
array('o', 'o', 'x'),
array('x', 'o', '' ));

To then return the third element in the second row of this array
echo $oxo[1][2];
which gives you x
Please can someone explain this
the answer is x
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