The Photoshop Learning Forum PHP Learning Array Declaration

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/*
* First, an overview of arrays
* 1. The nature of the array: managing and manipulating a set of variables, batch processing
* 2. Compound type when array (multiple can be stored)
* 3. You can store any length of data in an array, or you can store any type of data
* 4. Array can complete the function of other language data structure (list, queue, Stack, collection Class)
*
*
*
* Second, the classification of the array
* There are multiple cells in the array (cells are called elements)
* each element (subscript [key] and value)
* When a single element is accessed, the element is accessed by subscript (key)
* 1. One-dimensional arrays, two-dimensional arrays, three-dimensional arrays ... Multidimensional arrays
* (Array of arrays, which is the existence of other arrays in the array)
* There are two types of arrays in 2.PHP
* Index array: is the index of an ordinal integer that is the subscript
* Associative array: Is the subscript is the string as the index
*
* Subscript (integer, string) only these two types of
*
*
* Three, array of multiple declaration methods
*
* 1. Direct array element Assignment declaration
* If index subscript is not given, it will be indexed sequentially from 0
* If index subscript is given, the next will increase by 1 from the largest start
* If the previous subscript appears, the assignment is to reassign the previous element
* When mixing declarations, indexes and associations do not affect each other (do not affect the declaration of index subscript)
*
* 2. Using the array () function declaration
* Default is indexed array
* If you specify subscripts for associative arrays and indexed arrays, use the key = = value
* use "," split between multiple members
* 3. Use a different function declaration
*
*
*
*
*/
Indexed array
$user [0]=1;//User number
$user [1]= "Zhangsan";//username
$user [2]=10;//Age
$user [3]= "Nan";//gender
Echo '

Echo '

';
Associative arrays
$user ["id"]=1;
$user ["Name"]= "Zhangsan";
$user ["Age"]=10;
$user ["Sex"];
$user ["Age"]=90;//assignment
echo $user ["name"];//output
Declaring an array using array ()
$user =array (1, "Zhangsan", Ten, "Nan");
Declaring an associative array using array ()
$user =array ("id" =>1, "name" = "Zhangsan", "Age" =>10, "sex" = "Nan");
declaring multidimensional Arrays (multiple records) to hold multiple user information records in a table
$user =array (
Call this line with $user[0], such as calling the name in the record, $user [0][1]
Array (1, "Zhangsan", Ten, "Nan"),
Call this line with $user[1], such as calling the name in the record, $user [1][1]
Array (2, "Lisi", "NV")
);
Arrays save multiple tables with multiple records per table
$info =array (
"User" =>array (
Array (1, "Zhangsan", Ten, "Nan"),
Array (2, "Lisi", "NV")
),
"Score" =>array (
Array (1,90,80,70),
Array (2,60,40,70)
)
);
echo $info ["score"][1][1];//output 60,
?>

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