PHP array definition Getting Started Tutorial detailed _php tutorial

There are several ways to define arrays in PHP, such as Array (), or arr[] to implement arrays, let me give you a detailed description of the various techniques for PHP array definitions.

PHP array is an important concept, it contains a lot of functions, convenient for people to develop ... The array is now sorted to make it easy to query and

Use.
First, the definition of the PHP array ... The PHP array contains two items, key and value, which can be used to obtain the corresponding value, where key can be

To be numeric and associative, such as $array[0], $array [one] ...
Create an array
The array declaration in PHP is a little bit different from other languages, but it can be declared as one-dimensional, two-dimensional, three-dimensional, multidimensional, etc.
$array [0] = 1, $array = Array (n/a); A one-dimensional array that contains only three values, which are numeric arrays that can be referenced with $array

[0] to represent 1, you can omit the index when creating a numeric array

Creating arrays in PHP is defined using the array () structure, for example:

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$people =array (' name ', ' Sex ', ' nation ', ' brith ');

And how to display the values of each element in the array, we use an index starting at 0, and the index number is in square brackets after the variable name, such as

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： $people =array (' name ', ' Sex ', ' nation ', ' birth '); Echo $people [2]; ?>

The output of $people[2] is displayed as nation (the first item in the index is counted from 0).

In addition to supporting numeric index arrays, PHP supports related arrays. The so-called correlation array, that is, can be customized to replace the keyword is not intuitive

Numeric indexes, such as:

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$peoples =array (' xm ' = ' name ', ' xb ' = ' sex ', ' mz ' = ' nation ', ' cs ' = ' birth '); echo $peoples [' CS ']; ?>

Using a correlation array makes the selection of the output intuitive (no need to pre-compute the index number and then output), and the defined keyword and value are used between

the "= =" Symbol definition.

Depending on the way the PHP array elements are displayed, you can also create numbers directly, without having to declare and initialize the array () as a variable.

Like what

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$people [0]= ' name '; $people [1]= ' sex '; $people [2]= ' Nation '; $people [3]= ' Brith ';

Or

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$peoples [' XM ']= ' name '; $peoples [' XB ']= ' sex '; $peoples [' Mz ']= ' nation '; $peoples [' cs ']= ' birth ';

The size of the array varies dynamically depending on how many elements are added.

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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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