$arr = array('a','b','c','d');
unset($arr[1]);
print_r($arr);
?>
print_r($arr)之后，结果却不是那样的，最终结果是 Array ( [0] => a [2] => c [3] => d
那么怎么才能做到缺少的元素会被填补并且数组会被重新索引呢？答案是array_splice():
$arr = array('a','b','c','d');
array_splice($arr,1,1);
print_r($arr); // Array ( [0] => a [1] => c [2] => d )
?>
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