PHP array instance details, php array details _ PHP Tutorial

PHP array instance details, php array details. PHP array example explanation, php array explanation as a C ++ programmer, some obfuscation occurs on the PHP array during the PHP development process, similar to the C ++ array, there are some examples of non-PHP arrays, and php arrays

As a C ++ programmer, during the PHP development process, some obfuscation occurs on the PHP array, which is similar to the C ++ array, the following gives a comprehensive analysis of PHP arrays and their differences and relationships with the corresponding data types in C ++.

Array Category:

1. value array: It is also called an index array. it uses numbers (starting from 0) as the array subscript. It is equivalent to a vector in C ++.

2. join array: use a string as the subscript of the array. It is equivalent to map in C ++.

3. multi-dimensional array: each element in the array is also an array. Each element in its subarray can also be an array.

Array declaration:

1. numeric array

A. In the following example, the digital ID key is automatically assigned.

$ Names = array ("Peter", "Joe", "Lily ");
B. In the following example, we manually allocate a digital ID key.

$ Names [0] = "Peter ";
$ Names [1] = "Joe ";
$ Names [2] = "Lily ";

You can use these ID keys in the script:

<? Php $ names [0] = "Peter"; $ names [1] = "Joe"; $ names [2] = "Lily"; echo $ names [0]. "and ". $ names [1]. "are ". $ names [2]. "'s neighbors";/* Why do you ask hovertree.com */?>

2. join array:

Example 1

$ Ages = array ("Peter" => 32, "Joe" => 30, "Lily" => 28 );

Example 2

This example is the same as example 1. it is just another method for creating arrays.

$ages["Peter"] = "32"; $ages["Joe"] = "30"; $ages["Lily"] = "28"; 

Use the associated array in the script:

<? Php $ ages ["Peter"] = "32"; $ ages ["Joe"] = "30"; $ ages ["Lily"] = "28 "; echo "Peter is ". $ ages ["Peter"]. "years old. ";/* Why do you ask hovertree.com */?>

The above script output:

Peter is 32 years old.

3. multi-dimensional array:

In this example, we create a multi-dimensional array with the automatically assigned numeric ID key:

$families = array { "Griffin"=>array { "Peter", "Lois", "Megan" }, "Quagmire"=>array { "Glenn" }, "Brown"=>array { "Cleveland", "Loretta", "Junior" } }; echo "Is " . $families['Griffin'][2] . " a part of the Griffin family?"; 

The above code output:

Is Megan a part of the Griffin family?

1. for loop traversal

The for loop can only traverse the index array.

<?php $names = array("Peter","Joe","Lily"); for($id=0;$id
  
 

2. foreach traversal

You can traverse the index array or the associated array.

Traverse the index array

Foreach (array_expression as $ value) {loop body;} traverses the correlated array foreach (array_expression as $ key =>$ value) {loop body ;}

A. One-dimensional array traversal

Index array

<? Php $ contact = array ("Lee", "xx company", "abc@xx.com"); foreach ($ contact as $ value) {echo $ value ;}?> <? Php $ contact = array ("name" => "Lee", "company" => "xx company", "mailbox" => "abc@xx.com "); foreach ($ contact as $ key => $ value) {echo $ key. ":". $ value ;}?>

B. multi-dimensional array traversal

<? Php $ wage = array ("marketing department" = array (1, "Li", "marketing manager", 8000), array (2, "Wang ", "Marketing specialist", 5000), array (3, "Liu", "marketing specialist", 7000), "product department" = array (1, "Li", "product manager", 9000), array (2, "Wang", "product specialist", 6000), array (3, "Liu ", "Product Specialist", 5000), "Accounting Department" = array (1, "Li", "account manager", 7000), array (2, "Wang", "accounting specialist", 6000), array (3, "Liu", "accounting specialist", 5000 ))); foreach ($ wage as $ section => $ table) {echo $ section. "The team members are as follows"; foreach ($ table as $ row) {forea Ch ($ row as $ value) {echo $ value ;}}/ * What is hovertree.com */?>

The above is a detailed description of the php array instance provided by the small Editor, hoping to help you.

As a C ++ programmer, pipeline produces some obfuscation on the PHP array during the PHP development process, which is similar to the C ++ array, there are also some not...