PHP array Key Name tips Summary, array key Name summary _php Tutorial

PHP array Key Name tips Summary, array key Name summary

This article summarizes in detail the PHP array key name technique. Share to everyone for your reference. The specific analysis is as follows:

1, $arr [true] is equivalent to $arr [1]; $arr [false] is equivalent to $arr [0].

2. Make null the key name, equivalent to create or overwrite a $arr[null], can be accessed using $arr[null] or $arr[""].

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. As $arr[123.45]=5, you can get the key value using $arr[123.45] or $arr[123], and use a foreach traversal with $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 is helpful to everyone's PHP programming.

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