How to run a query in php PDO: 1. Create a variable called tis, and you can see that the query function is used in the created $conn object. 2. Run a while loop, create a $row variable, and get the content from the $tis object.
PDO library in php: 1. It can support 12 different types of database drivers, so PDO has received more praise. 2. PDOs have other features that make them a better choice for most developers.
Detailed explanation of common PHP operating modes: 1. CGI connects web pages and programs in the WEB. 2. Fast-cgi is an upgraded version of cgi mode. 3. CLI is the interface for command line operation. 4. Web module mode, used for apache+php operation. 5
PHP uses fread() to operate bytes: divided into 1. Confirm the bytes that need to be read. 2. Do not confirm the bytes that need to be read. If you want to get all the contents of the file, you need to use another function filesize() function to check the
The define method of defining constants in PHP: 1. Variables in PHP refer to the amount that the value used in the program can change, and the opposite is a constant. 2. After the constant value is defined, it cannot be changed anywhere else in the script
