Home Backend Development PHP Tutorial PHP array pointer operation implementation code_PHP tutorial

PHP array pointer operation implementation code_PHP tutorial

Jul 21, 2016 pm 03:31 PM
arr array php code internal accomplish Will pointer operate array of

/**
* Back the internal pointer of the array by one bit
* @param array &$arr
* @return mixed Returns the value of the previous unit, and returns FALSE when there are no more units
* if If the array contains empty cells, or the value of the cell is 0, this function will also return FALSE when encountering these cells
* To correctly traverse the array that may contain empty cells or the value of the cell is 0, see each() function
*/
mixed prev(array &$arr);
$transport = array('foot', 'bike', 'car', 'plane' );
$mode = current($transport); // $mode = 'foot';
$mode = next($transport); // $mode = 'bike';
$mode = next($transport); // $mode = 'car';
$mode = prev($transport); // $mode = 'bike';
$mode = end($transport); // $mode = 'plane';
$mode = reset($transport) ;//$mode = 'foot';
?>

array("key"=>"value ");Create an array
//Display the array
print_r($array);
//Use the compact() function to create a new array and use the parameters as the units of the new array;
$newArray = compact("red","green","yellow","blue","array");
//Use the extract() function to convert the cells in the array into variables
extract($exArray);
echo "$key1 $key2 $key3 $key4 $key5";


※Check value, key
array_key_exists($key,$array);//Check array key
in_array($value,$array);//Check the value in the array

※Get the value
//Use array_values() to get the value of the array
$carValues ​​= array_values($car);
//Get the key name of the array
$twoKeys = array_keys($two);
key($array);//Output the key name of the current unit
//After the array is defined, use current () Get the value of the current unit
$red = current($array);
list($red,$green) = $array;//Assign the value in the array to the variable, $array = array( "Red", "Green");
each($two);//Return the key and value of the current unit in the array

※Traverse the array
foreach($two as $subArray); //Traverse the array
while(list($key,$value) = each($array)){
echo "$key=>$value,";//Use each to traverse the array
}

※Fill the array
//Fill the array to the left and right
array_pad($array,+3,"shuzhi");//The 2nd parameter is filled from left to right, the value is greater than Only fill in the number of cells
$array1 = array_fill(5,5,"test");//Use array_fill() to fill the value of this array, the value is test, start filling from the 5th cell, and fill 5 in total Unit
//Fill array key name
$keys = array('string', 5, 10, 'str');
$array3 = array_fill_keys($keys, "array value");
//Use the array_filp() function to exchange key names and values
$speed = array_flip($speed);
//Use the array_splice() function to replace the value of the 6th unit with 7
$output = array_splice($input,6,0,7);
//Use the array_splice() function to delete the array cells and keep only the first 5 cells
$output = array_splice($input,5);
$ array1 = range(10,100,10); //Use the third parameter of the range() function to set the step value between units


※Sort
shuffle($array); //Shuffle the order of the arrays
//Use array_multisort() to sort three arrays
array_multisort($sort1,$sort2,$sort3);
//Sort this array and keep the index Relationship
asort($array);
//Reverse sort the test array and maintain the index relationship
arsort($array);
//Use ksort() to sort the array by key name
ksort($array);
//Use krsort() function to reverse sort by key name
krsort($array);
//Use sort() to sort the test array [arranged by key name] ]
sort($array);
//Use natsort() to sort [natural sorting, numerical arrangement] sensitive to the case of unit values ​​
natsort($array);
//Use natcasesort ()Function sorting [natural sorting] but ignoring numerical case
natcasesort($array);
//Use the array_reverse() function to sort, and the array units are arranged in reverse order
$newArray = array_reverse($array, TRUE);//Retain the original key name when TRUE is set

※Intersection and difference set
//Use array_diff() to calculate the difference set of three arrays [Compare array values]
$result = array_diff($dog1,$dog2,$dog3);
//Use array_diff_assoc() to calculate the difference set of three arrays [compare values ​​and key names]
$result = array_diff_assoc($dog1,$dog2 ,$dog3);
//Use array_diff_key() to calculate the difference set of three arrays [compare key names]
$result = array_diff_key($dog1,$dog2,$dog3);
//Use array_intersect() calculates the intersection of three arrays [compare array values]
$result = array_intersect($dog1,$dog2,$dog3);
//Use array_intersect_assoc() to calculate the intersection of three arrays [compare array values] Comparison of values ​​and key names]
$result = array_intersect_assoc($dog1,$dog2,$dog3);
//Use array_intersect_key() to calculate the intersection of three arrays [Compare key names]
$result = array_intersect_key($dog1,$dog2,$dog3);

※Merge arrays
//Use array_merge() function to merge arrays
$result = array_merge($array1,$array2,$array3, $array4,$array5);
array_rand($input,10);//Randomly take out 10 units
count($array,COUNT_RECURSIVE);//Display the number of array units, parameter 2 can only be 1 or COUNT_RECURSIVE, sometimes you can traverse multi-dimensional arrays

※Pop and pop
//Array pops from the stack, last in first out, the last unit of the array pops up
array_pop($array);
//Array in Stack, add two values ​​​​7 and 8 to the end of the array
array_push($array, 7, 8);
//Move the beginning unit of the array out of the array
array_shift($array);
/ /Add 7, 8 to the beginning of the array
array_unshift($array,7,8);

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322952.htmlTechArticle/** * Back the internal pointer of the array by one bit* @param array $arr); ?php $ transport = array('foot', 'bike', 'car', 'plane'); $mode = current($transport); // $mode = 'foot'; $mode = nex...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

7 PHP Functions I Regret I Didn't Know Before 7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

See all articles