The second stage of PHP is to learn the basic syntax of php. The second stage is the basic syntax.

The second stage of PHP is to learn the basic syntax of php. The second stage is the basic syntax.

Basic php syntax

Output statement: A. echo output: multiple strings can be output, separated by commas

B. print Output: Only one string can be output. true or false is returned.

C. print_r (): the string and number can be simply printed out, while the Array is displayed in the form of an enclosed key and a list of values, and starts with Array.

D. var_dump: output type

Data Type: A. Weak Language

B. gettype ()

C. Judge type is _ type name ()

Variable definition: A. $ variable name = Value

B. Super global variable $ GLOBALS

C. Variable

D. Is the isset () variable defined?

E. unset () variable clearing

F. empty () determines whether the variable is null.

G. & get address

Type conversion: A. (Data Type) Variable

B. type conversion settype (variable name, type)

Operator expressionA: mathematical operators

B: String: the concatenation string uses.

C: comparison operator

D: logical operator and & or |

E: Others: @ logical control operator

? Ternary Operators

Statement: Branch statement: a. if... else

B. switch... case

Loop a.

B. while

FunctionDefinition

Elements B

C usage

D common random number generator rand ()

Take the current time ()

Date ()

Strtotime () converts an event to a UNIX Timestamp

Set the time zone date_default_timezone_set ('prc ')

Date. timezone = Europe/Paris changed to Etc/GMT-8

Format time date ()