Introduction to PHP knowledge

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PHP：

Server-side scripting language

Save the file with .php extension

mark:

<?php
	/* 你的PHP代码 */
?>

Output:
echo "string";

Variables:
PHP variables are all symbols beginning with $

如：$username、 $password
$username = “abc”;

type of data:

Select structure

Loop structure

function

Array:
an array of numbers - - array with key ID
associative array - - associated with each key in a ID array value

JSON Codec:
json_encode (phpValue) - - The value encoded as JSON text PHP

json_decode (jsonText) - - The value JSON text decoder for php

Request information acquisition front-end:
$ _GET
$ _POST