The relationship between keys and values in php arrays

The relationship between keys and values in php arrays

● Keys in php arrays can be repeated, but repeated keys The value will be overwritten by the later one.

● Values with different keys in the php array can be repeated.

● Elements in the php array can have keys or no keys.

 'a', 'a' => 'b'); var_dump($arr); // 结果 // array(1) { ["a"]=> string(1) "b" } // 数组元素可以有键，也可以没有键 $arr1 = array('a', 'b' => 'b'); var_dump($arr1); // 结果 // array(2) { [0]=> string(1) "a" ["b"]=> string(1) "b" } ?>

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