This article mainly introduced the PHP array key name technique summary, has analyzed the PHP array key name common use skill, has certain reference value, needs the friend to be possible to refer to under
This paper summarizes the technique of PHP array key name in detail. Share to everyone for your reference. The specific analysis is as follows:
1, $arr [true] is equivalent to $arr ; $arr [false] is equivalent to $arr .
2, make null as the key name, equivalent to create or overwrite a $arr[null], you can use $arr[null] or $arr["" "" "to access.
3. When using a number with a decimal point as the key name, the key name automatically intercepts the integer part as the key name. In the case of $arr[123.45]=5, you can get the key value using $arr[123.45] or $arr[123, and when you traverse with a foreach, you use a $arr[123.
4, $arr =5, the element is added after the array $arr.
Note: The data type of the key name in the array is an integer or string type
I hope this article will help you with your PHP program design.