Array usage of PHP Lesson 6

Learning Overview: * understanding the use of basic array functions * understanding the traversal of arrays * understanding the basic relationship of ultra-global arrays and using arrays 1. array definition and traversal 2. array Function Array definition: $ arrarray (, 3); index array, subscript is all numbers $ arrarray (nameuser1, age30); associated array, subscript contains only two letter subscript

Learning Overview: * understanding the use of basic array functions * understanding the traversal of arrays * understanding the basic relationship of ultra-global arrays and using arrays 1. array definition and traversal 2. array Function array definition: $ arr = array (1, 2, 3); // index array, subscript is all numbers $ arr = array (name = user1, age = 30 ); // associate the array. The subscript contains only two types of letters // subscript

Learning Overview:

* Understand how to use basic array Functions

* Understanding how to traverse Arrays

* Understand the basic relationships and usage of ultra-global arrays

Array

1. Define and traverse Arrays
2. array Functions

Array definition:
$ Arr = array (1, 2, 3); // index array, subscript is all numbers
$ Arr = array ("name" => "user1", "age" => "30"); // associate an array. The subscript contains letters.
// There are only two subscripts, either letters or numbers without double quotation marks.

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

Array Subscript:
If it is a letter
$ Arr = array ("name" => 100, "age" => 400, => 6, 7, => );
// Subscript printing: "name" 0
[Name] => 1
[0] => 3
[Age] => 4
[1] => 5
[2, 100] => 6
[101] => 7
[400] => 8
[401] => 9


Array value:
1. output the entire array

print_r($arr)

2. Output a value in the array

$arr=array("name"=>1,3,"age"=>4,5,"100"=>6,7,"400"=>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

Cyclically add judgment:

2. foreach Loop
Foreach performs 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;
}

// We recommend that you use foreach to traverse the array.

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


Two-dimensional array traversal:

 ";print_r($arr);echo "

"; Echo" "; foreach ($ arr as $ val) {if (is_array ($ val) {foreach ($ val as $ val2) {echo $ val2 ."
";}} Else {echo $ val ."
";}}?>



3D array values:

 ";print_r($arr);echo "

"; Echo" "; foreach ($ arr as $ val) {if (is_array ($ val) {foreach ($ val as $ val2) {if (is_array ($ val2) {foreach ($ val2 as $ val3) {echo $ val3 ."
";}} Else {echo $ val2 ."
";}}} Else {echo $ val ."
";}}?>


// One-dimensional array and two-dimensional array are recommended.
A data table is actually a two-dimensional array, and each row of records in it is a one-dimensional array.

Query the database:

 ";    print_r($row1);    echo "

";?>




Ultra Global Array:
Ultra-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 Address
[SERVER_PORT] => 80 // port number
[REMOTE_ADDR] => 127.0.0.1 // client access ip Address
[DOCUMENT_ROOT] => E:/AppServ/www
[SERVER_ADMIN] => goxuexi@126.com
[SCRIPT_FILENAME] => E:/AppServ/www/index. php // absolute path of the script file name
[REMOTE_PORT] = & gt; 49881
[GATEWAY_INTERFACE] = & gt; CGI/1.1
[SERVER_PROTOCOL] => HTTP/1.1
[REQUEST_METHOD] => GET
[QUERY_STRING] => // request string
[REQUEST_URI] => // request url
[SCRIPT_NAME] =>/index. php // Script Name (relative to the website root directory)
[PHP_SELF] =>/index. php
[REQUEST_TIME] => 1407568551 // access time
[Argv] => Array
(
)


[Argc] => 0
)

$ _ GET get GET the data submitted with get

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

Communication between two pages:
1. form pass Value
First: get Method
Method 2: post

Only the get method can be used.


We recommend that you use post to submit data for a form.


Magic_quotes_gpc = on; indicates that when the get request is enabled, the 'prefix \


Get instance:
Index. php

 Receive informationJunjun2
Junzai3
Junjun4
Junjun5

Rev. php

 Receive informationWelcome:
 Name:
 Age:
 

Post instance
$ _ POST: Get the data from the form post

Index. php

 Receive informationSubmit user information

Rev. php

 
 
  Receive informationWelcome:
  Name:
  Age:
  
 

$ _ REQUEST
Obtain data from a, form get, or post.

$ _ COOKIES
Obtain the same page from multiple pages

$ _ SESSION
The same variable is obtained on multiple pages.
$ _ FILES
Obtain the file in the form and generate an array.

$ GLOBALS
$ GLOBALS [_ SERVER]
$ GLOBALS [_ GET]
$ GLOBALS [_ POST]
$ GLOBALS [_ FILES]
$ GLOBALS [_ REQUEST]
$ GLOBALS [_ COOKIES]
$ GLOBALS [username] // contains global variables on the page and changes the value of $ username through $ GLOBALS [username] = "user2.

Instance: use $ GLOBALS to change the value of the global variable.

 ";print_r($GLOBALS);echo "

";?>