This article analyzes the usage rules of arrays in PHP. Share to everyone for your reference. The specific analysis is as follows:
Arrays are in a very important position in PHP. strings, pictures, digital, and video equivalents are all in the form of arrays, so it is necessary to understand the various rules of the array.
1, key, value.
The basic form of the array:
Array ([key =>]
value
, ...
)
Key=>value, where the key can only be two, integer, String. and value can be of various forms, except for numbers, other values must be "or" "" to enclose the string. The following example illustrates the rule:
<?php
$a = Array ( -1=>2,
-2=>3,
' the ' => ' 99.jpg ',
8,
' A ',
' B ' =>true,
NULL,
"",
1.2=>0.5,
);
Print_r ($a);
? >
Output: Array ([-1] => 2 [-2] => 3 [a] => 99.jpg [0] => 8 [1] => 0.5 => 1 [2] => [3] =>)
I hope this article will help you with your PHP program design.