php - array_filter 与关联数组？

Question

我正在使用 array_filter 来做这样的事情:

function endswithy($value) {
    return (substr($value, -1) == 'y');
}

$people = array("Johnny", "Timmy", "Bobby", "Sam", "Tammy", "Danny", "Joe");
$withy = array_filter($people, "endswithy");
var_dump($withy);

但是例如过滤器中的更多选项

$people = array(
             "Johnny"=>array("year"=>1989, "job"=>"prof"),
             "Timmy"=>array("year"=>1989,  "job"=>"std"),
             "Bobby"=>array("year"=>1988),
             "Sam"=>array("year"=>1983),
             "Tammy"=>array("year"=>1985),
             "Danny"=>array("year"=>1983),
             "Joe"=>array("year"=>1989,"job"=>"prof"));

或者

$people = array(
             array("name"=>"Johnny","year"=>1989, "job"=>"prof"),
             array("name"=>"Timmy","year"=>1989,  "job"=>"std"),
             array("name"=>"Bobby""year"=>1988),
             array("name"=>"Sam","year"=>1983),
             array("name"=>"Tammy","year"=>1985),
             array("name"="Danny","year"=>1983),
             array("name"="Joe","year"=>1989,"job"=>"prof"));

我怎样才能得到唯一的这个人(以y和year=1989和job=prof结尾)，我可以使用array_filter吗？或任何内置函数可以做到这一点？

$people = array(
                 "Johnny"=>array("year"=>1989, "job"=>"prof")
  );

或者

$people = array(
                 array("name="Johnny","year"=>1989, "job"=>"prof")
  );

Answer 1

PHP 5.6 introduces可选标志 ARRAY_FILTER_USE_KEY 允许这样做:

function endswithy($name) {
    return (substr($name, -1) == 'y');
}

$people = array(
     "Johnny"=>array("year"=>1989, "job"=>"prof"),
     "Timmy"=>array("year"=>1989,  "job"=>"std"),
     "Bobby"=>array("year"=>1988),
     "Sam"=>array("year"=>1983),
     "Tammy"=>array("year"=>1985),
     "Danny"=>array("year"=>1983),
     "Joe"=>array("year"=>1989,"job"=>"prof")
);

$peopleEndingInY = array_filter($people, 'endswithy', ARRAY_FILTER_USE_KEY);

// Outputs: 5
var_dump(count($peopleEndingInY));

如果您需要维护键和值，另一个标志 ARRAY_FILTER_USE_BOTH 将执行此操作，如本示例所示:

$ar = array(
    'key1' => 'value1',
    'key2' => 'value2'
);

//Note that this doens't actually filter anything since it doesn't return a bool.
$output = array_filter($ar, function($value, $key){
    echo sprintf("%s => %s\n", $key, $value);
}, ARRAY_FILTER_USE_BOTH);