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What is Multidimensional array :
A multi-dimensional array each element in the main array can also be an array
Syntex :
$variable_name = array(
'key'=>array('key'=>'value','key'=>'value'),
'key'=>array('key'=>'value','key'=>'value'),
);
Example :
$marks = array(
'a' =>array('hindi'=>'60','english'=>'40'),
'b' =>array('hindi'=>'60','english'=>'40'),
);