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.
<?php
// 键可以重复，不会报错，但重复的键的值会被后面的覆盖
$arr = array('a' => 'a', 'a' => 'b');
var_dump($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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