Php array, correction, traversal, function, etc.

Php array, modification, traversal, functions, and other php & nbsp; W3c & nbsp; php array, modification, traversal, function, etc.

Php W3c http://www.w3school.com.cn/php/func_array_search.asp

Php array format:

①, Numerical array

Format: array (v1, v2, v3, v4 ,.....)

Array (value 1, value 2, value 3 ,......)

② Join an array

Format: array (k1 => v1, k2 => v2, k3 => v3 ,.......)

Array (key 1 => value 1, key 2 => value 2, key 3 => value 3 ,......)

③ Multi-dimensional data

$ Arr_arr = array (4567, 77.7, 99,100), "aa", "bb", cc );

Data Display:

Print_r ()

Var_dump () (contains the type, length, and other information)

$ Arr = array (1, 2, 3, 4, 5 );
Print_r ($ arr );
Echo"
";
Var_dump ($ arr );

The result is:

Array ([0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5)
Array (5) {[0] => int (1) [1] => int (2) [2] => int (3) [3] => int (4) [4] => int (5 )}

Array traversal foreach ():

$ Arr = array (1, 2, 3, 4, 5 );

Foreach ($ arr as $ k =>$ v ){
Echo "key => value is". $ k. "=>". $ v ."
";
}

Multi-dimensional array output:

$ Arr_arr = array (4567, 77.7, 99,100), "aa", "bb", cc );
Echo "var_dump multi-dimensional array
";
Var_dump ($ arr_arr );
Echo "print_r () multi-dimensional array
";
Print_r ($ arr_arr );

Display:

Var_dump multi-dimensional array
Array (4) {[0] => array (4) {[0] => int (4567) [1] => float (77.7) [2] => int (99) [3] => int (100)} [1] => string (2) "aa" [2] => string (2) "bb" [3] => string (2) "cc"} print_r () multi-dimensional array
Array ([0] => Array ([0] => 4567 [1] => 77.7 [2] => 99 [3] => 100) [1] => aa [2] => bb [3] => cc)

Array functions:

Delete function: unset ($ arr ['K']);

Value sorting: sort (), rsort () (reverse)

Key sorting: ksort (), krsort ()

Sum: array_sum ($ array)

Number: count () <----> sizeof ()

Search: in_array (value, $ array)

Array_search (value, $ array)

Look at the W3Cschool, paste a directory, and get familiar with the learning plan:

I. php Basics

PHP Basics

• PHP Tutorial
• PHP introduction
• PHP installation
• PHP syntax
• PHP variables
• PHP string
• PHP operators
• PHP If... Else
• PHP Switch
• PHP array
• PHP loop
• PHP functions
• PHP form
• PHP $ _ GET
• PHP $ _ POST

2. php advanced

PHP advanced

• PHP date
• PHP Include
• PHP files
• PHP file Upload
• PHP Cookies
• PHP Sessions
• Php e-mail
• PHP secure E-mail
• PHP Error
• PHP Exception
• PHP Filter

III. php database

PHP database

• MySQL introduction
• MySQL Connect
• MySQL Create
• MySQL Insert
• MySQL Selecth
• MySQL Where
• MySQL Order
• MySQL Update
• MySQL Delete
• PHP ODBC

4. php and xml

PHP XML

• XML Expat Parser
• XML DOM
• XML SimpleXML

V. php and ajax

PHP and AJAX

• AJAX introduction
• XMLHttpRequest
• AJAX Suggest
• AJAX XML
• AJAX Database
• AJAX responseXML
• AJAX Live Search
• Ajax rss Reader
• AJAX Poll

VI. php Reference Manual

PHP Reference Manual

• PHP Array
• PHP Calendar
• PHP Date
• PHP Directory
• PHP Error
• PHP Filesystem
• PHP Filter
• PHP FTP
• PHP HTTP
• PHP LibXML
• PHP Mail
• PHP Math
• PHP MySQL
• PHP SimpleXML
• PHP String
• PHP XML
• PHP Zip
• PHP Miscellaneous