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<?php
$people = array(
	array(
		'david' => 'homebuilder',
		'state' => 'WA'
	),
	array(
		'steve' => 'programmer',
		'state' => 'MN'
	),
	array(
		'jim' => 'photographer',
		'state' => 'TX'
	),
);

$response = array_filter($people, function($person)
{
	return isset($person['steve']);
});

print_r($response);

/*
Array
(
    [1] => Array
        (
            [steve] => programmer
            [state] => MN
        )

)


0.00017094612121582
*/