What are the points to pay attention to in the process of learning php?

This article introduces the relevant knowledge of "what are the points you need to pay attention to in the process of learning php". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1.php passes a value to javascript

How php passes the value to javascript: you need to put quotation marks around the tag

Note: in fact, there was a mistake in my original understanding. Php is a dynamic display language. In fact, in the echo that displays the relevant text, it is natural to add quotation marks because the original one does not contain quotation marks.

two。 Timestamp conversion

Strtotime can convert datetime in mysql into timestamps.

3. About data rounding

The 2 after number_format ($time*$deposit_money*0.05/365,2) indicates that 2 decimal places are reserved and are rounded. Another way echo sprintf (".2f", $number); not rounded

1.GRANT and REVOKE commands:

Grant and revoke permissions to mysql users, which are divided into four levels: global-database-table-column

two。 Create an index

Can make queries faster create index statements

3. Retrieve variables

$POST $_ GET $_ REQUEST

4.heredoc syntax

Echo