PHP lesson Sixth the use of arrays

Study Summary:

* Understand the use of basic array functions

* Understand the traversal of arrays

* Understanding the basic relationships and use of hyper-global arrays

Array

1. Array definition and traversal
2. Array function

Array definition:
$arr =array (1,2,3);//index array, subscript all numbers
$arr =array ("name" => "user1", "Age" => "30");//associative array, subscript contains letters
There are only two kinds of subscript, or letters, if it's a number with no double quotes.

 
  1,3, "age" =>4,5,100=>6,7,400=>8,9);
			echo "
";
			Print_r ($arr);
			echo "
";


			? >

Array subscript:
If it's a letter,
$arr =array ("name" =>1,3, "age" =>4,5,100=>6,7,400=>8,9);
Subscript Printing: "Name" 0
[Name] => 1
[0] => 3
[Age] => 4
[1] => 5
[MB] => 6
[=>] 7
[=>] 8
[401] => 9


Array value:
1. Output the entire array

Print_r ($arr)

2. A value in the output array

$arr =array ("name" =>1,3, "age" =>4,5, "=>6,7", "=>8,9");
			
				echo $arr [' age '];
				echo "
";
				echo $arr [100];

3. Array Assignment:
1. $arr [' Age ']=30;
Array assignment can also define an array:
$arr []=1;
$arr []=2;

4. Array Traversal:
1.for Loop

 
  Subclause ". ($i + 1). " The name of the individual is {$arr [$i]} ";
			 	
			 	}
				? >

Circular plus judgment:

	
 
  Subclause ". ($i + 1). " The name of the individual is {$arr [$i]} ";
		 		} else{
		 			echo "
Subclause ". ($i + 1). " The name of the individual is {$arr [$i]}
";
		 		}
		 	
		 	}
			? >

2.foreach Loop
foreach for array traversal:

 
  ";	
			Print_r ($arr);
			echo "

"; foreach ($arr as $key => $val) {$num + +; if ($num%2==1) {echo

{$key}:{$val}

"; } else{echo "

{$key}:{$val}

"; } } ? >


3.while....list.. Each loop traversal
while (list ($key, $val) =each ($arr)) {
echo $key. $val;
}

It is recommended to traverse an array using foreach

Multidimensional Arrays:
1. One-dimensional array $arr =array (1,2,3);
$arr [0];
2. Two-D array $arr =array (1,2,array (4,5));
$arr [2][0];
2. Two-D array $arr =array (1,2,array (3,array (4,5));
$arr [2][1][0];


Two-dimensional array traversal:

 
  ";
				
				Print_r ($arr);	
				
				echo "

"; echo " "; foreach ($arr as $val) {if (Is_array ($val)) {foreach ($val as $val 2) {echo $val 2. "
"; } } else{echo $val. "
"; } } ? >



Three-dimensional array values:

 
  ";
				
				Print_r ($arr);	
				
				echo "

"; echo " "; foreach ($arr as $val) {if (Is_array ($val)) {foreach ($val as $val 2) {if (Is_array ($val 2)) {foreach ($val 2 as $val 3) {echo $val 3. "
"; } } else {echo $val 2.
"; } } } else{echo $val. "
"; } } ? >


It is recommended to use one-dimensional arrays and two-dimensional arrays
A data table is actually a two-dimensional array in which each row is a one-dimensional array.

Query database:

 
  ";
			    Print_r ($row 1);
			    echo "

";?>




Super Global Array:
Super Global Array
$_server
$_get
$_post
$_request
$_files
$_cookies
$_session
$GLOBALS

$_server View server information

 
  ";
				    Print_r ($_server);
				    echo "

";?>

apache/2.2.8 (WIN32) php/5.2.6 Server at localhost Port 80




[Server_software] => apache/2.2.8 (Win32) php/5.2.6
[server_name] => localhost//Server domain name
[SERVER_ADDR] => 127.0.0.1//server IP
[Server_port] => 80//port number
[REMOTE_ADDR] => 127.0.0.1//Client Access IP
[Document_root] => e:/appserv/www
[Server_admin] => goxuexi@126.com
[Script_filename] => e:/appserv/www/index.php//script file name absolute path
[Remote_port] => 49881
[Gateway_interface] => cgi/1.1
[Server_protocol] => http/1.1
[Request_method] => get
[Query_string] =>//Request string
[Request_uri] =>///request URL Address
[Script_name] =>/index.php//script name (relative to site root)
[Php_self] =>/index.php
[Request_time] => 1407568551//access time
[argv] => Array
(
)


[ARGC] => 0
)

$_get Gets the data submitted with get.

Http://localhost/index.php?id=10&name=user1

Two communication between pages:
1. Table conveys value
The first kind: Get Way
The second type: Post mode
2.a Label Pass Value
Can only be used in get mode

A label recommends using GET method to submit data
The form recommends submitting data using post


MAGIC_QUOTES_GPC = on; When a GET request is opened, the ' front plus \


Get instance:
index.php

				 
				
				Receive information
				
				
				
				Junjun2

				Junzai3

				Junjun4

				Junjun5

				
				
			

rev.php

					 
					
					Receive information
					
					
					
					
Welcome:
					
  
   
					
					
 
  
					
Name:
  
   
					
Age:
  
   
					
					
					

Post instance
$_post: Get the data from the form POST

index.php

				 
				
				Receive information
				
				
				
				
Submit User Information
				 
 
  
   
  
					Name:
  
   
  
   

					Age:
  
   
  
   

					
  
   
				
 
  
				
				
			

rev.php

					 
					
 
  
					
  
   
					Receive information
					
					
					
					
  
   
Welcome: 
    
					
  
   
					
  
   
Name: 
    
					
  
   
Age: 
    
					
					
				
 
  

$_request
Gets the data for a or form get or post.

$_cookies
The same page gets on multiple pages

$_session
The same variable is fetched from multiple pages
$_files
Gets the files in the form and generates an array.

$GLOBALS
$GLOBALS [_server]
$GLOBALS [_get]
$GLOBALS [_post]
$GLOBALS [_files]
$GLOBALS [_request]
$GLOBALS [_cookies]
$GLOBALS [username]//contains global variables within the page, and $username values are changed by $globals[username]= "User2".

Instance: Use $globals to change the value of a global variable.

 
  ";
					Print_r ($GLOBALS);
					echo "

";?>

Reprint please indicate the source: HTTP://BLOG.CSDN.NET/JUNZAIVIP