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Link: http://codepad.org/OG5rguJ8    [ raw code | output | fork ]

PHP, pasted on May 4: 
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<?php

$array = array(
	array( 'type' => 'A', 'month' => 'Jan' ),
	array( 'type' => 'B', 'month' => 'Feb' ),
	array( 'type' => 'A', 'month' => 'Mar' )
);

foreach( $array as $key => &$value ){
	if ( $value['type'] != 'A' )
		unset( $array[ $key ] );
}

print_r( $array );


Output: 
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Array
(
    [0] => Array
        (
            [type] => A
            [month] => Jan
        )

    [2] => Array
        (
            [type] => A
            [month] => Mar
        )

)


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