Numeric functions, other rand, floor, ceil, round, $ REMOTE_ADDR

Numeric functions, other rand, floor, ceil, round, $ REMOTE_ADDR numeric functions

Srand	Random number initialization
Rand	Random number generation
Floor	Integer truncation
Ceil	Function rounded up to the nearest integer
Round	The function rounds a floating point number.
Sqrt	Square root

Srand (random number initialization)

srand(time);

** Use the current time to initialize the random number generator.

Rand (random number)

[Example]

$ I = rand (0, 99); | _ upper limit | _ lower limit

** $ I is set to 0 ~ The random number of 99.

Floor (integer truncation)

[Example]

$i = floor(1.9);

** $ I is set to 1.

Ceil (function rounded up to the nearest integer)

[Example]

$i = ceil(1.1);

** $ I is set to 2.

Round (function rounding floating point number)

[Example]

$ I = round (1.5 [, 2]); | _ specifies the number of digits after the decimal point | _ value $ I = round (1.5 );

** $ I is set to 2.

$i = round(1.123, 2);

** $ I is set to 1.12.

Sqrt (square root)

[Example]

$i = sqrt(2);

** $ I is set to 1.14.

Other functions

Chmod	Set permissions
Sleep	Delay seconds

Chmod (set permissions)

[Example]

chmod("path/filename", 0666);

** Permission settings.

Sleep (delay in seconds)

[Example]

sleep(10);

** Stop PHP execution within 10 seconds. (Stop Execution at any time)

Environment variable

_ LINE __	Execution line number
PHP_VERSION	PHP version
PHP_ OS	PHP System
$ DOCUMENT_ROOT	Web root directory
$ SCRIPT_FILENAME	Current PHP physical Path Intelligence
_ FILE __	Current PHP physical Path Intelligence
$ REMOTE_ADDR	IP address of the remote terminal
$ HTTP_REFERER	URL before the departure terminal
$ HTTP_USER_AGENT	Browser information
$ SCRIPT_NAME	Current PHP Path Intelligence
$ PHP_SELF	Current PHP Path Intelligence
$ SERVER_NAME	Server host name
$ SERVER_SOFTWARE	Software name and network version
$ GATEWAY_INTERFACE	CGI version of the Web server

Image reflection

** Fopen ("php: // stdout", 'wb') does not work well if you try again.

Redirection

header("Location: path/filename");            |_ http://sak-main/test.htm                       ./w_test/test.php                       a001.php?p1=a

** Other HTML and PHP redirection methods.

Session Management

** PHP has session management that can be used in the same way as ASP session management. It is good to share and use variables between different pages.

Session_start ();	Start marking
Session_register ("ses1", "ses2 ″);	Register session variables
Action = "sestest2.php? "	Session ID management

** SID, PHP performs operations based on different environment configurations, even if not specified.

       
   Session Test 1      
Listen session test 1 quit
        
Session variable
$ Ses1 =
  
$ Ses2 =
  
  
        
       
   Session Test 2      
Listen session Test 2
        
Session variable
$ Ses1 =
  
$ Ses2 =