Basic PHP Learning

1. Character encoding: The character encoding used in a file indicates what character the file will display. Set character encoding <meta .....charset=utf-8>

2. PHP sends data to Web browser: Echo, print

3. Comments:

#编号注释; #This is a comment

Double slash://this is also a comment

/* * *: Allows annotations to be distributed across multiple lines.

4. Pre-defined variables: $_server[' script_filename ', ' http_user_agent ', ' server_software ']

5. String function:

strlen string length;

. connection string;

Strtolower () string becomes lowercase;

Strtoupper () string to uppercase

Ucfirst () first character uppercase

Ucwords () capitalizes the first character of each word.

. = Join Assignment operator

6, the number function:

Round () rounding the nearest integer

Number_format () Converts a number to a more common representation format, using a comma as the thousand separator character.

7, constant definition:

Define (' PI ', 3.14)

Echo PI

8, double quotes and single quotes

Single quotation marks: The values within will be processed in the literal sense. The value within the double quotation marks is interpreted.

Basic PHP Learning