<?php
 
$people[0]['age'] = 17;
$people[0]['name'] = "鈴木";
$people[0]['sex'] = "男性";
$people[1]['age'] = 23;
$people[1]['name'] = "佐藤";
$people[1]['sex'] = "女性";
$people[2]['age'] = 58;
$people[2]['name'] = "鈴木";
$people[2]['sex'] = "女性";
 
$people = array_filter(
    $people,
    function ($person) {
    	static $names;
        $ret = !isset($names[$person['name']]);
        $names[$person['name']] = true;
        return $ret;
    }
);
 
print_r($people);

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