PHP array_keys()

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PHP

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$member = [ 'ID'=>102, 'Name'=>'YONEZAWA Akinori', 'Address'=>'Naha, Okinawa' ];
$keys = array_keys($member);
print_r($keys);

Array
(
    [0] => ID
    [1] => Name
    [2] => Address
)

PHP

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$arr = [0 => 100, "color" => "red"];
print_r(array_keys($arr));

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PHP

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$arr = ["color" => ["blue", "red", "green"], "size"  => ["small", "medium", "large"]];
print_r(array_keys($arr));

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PHP

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$arr = ["blue", "red", "green", "blue", "blue"];
print_r(array_keys($arr, "blue"));

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