Table of Contents
Summary of PHP methods of finding and searching array elements
Home Backend Development PHP Tutorial Summary of methods of finding and searching array elements in PHP_PHP Tutorial

Summary of methods of finding and searching array elements in PHP_PHP Tutorial

Jul 13, 2016 am 09:50 AM
php and element Summarize search operate array method yes Find of filter

Summary of PHP methods of finding and searching array elements

Finding, filtering and searching array elements are some common functions of array operations. Here are some related functions.

in_array() function

The in_array() function searches for a specific value in an array and returns true if the value is found, otherwise it returns false. Its form is as follows:

boolean in_array(mixed needle,array haystack[,boolean strict]);

Look at the following example to find whether the variable apple is already in the array. If it is, output a piece of information:

1

2

3

4

$fruit = "apple";

$fruits = array("apple","banana","orange","pear");

if( in_array($fruit,$fruits) )

echo "$fruit 已经在数组中";

1 2

3

4

$fruit = "apple";

$fruits = array("apple","banana","orange","pear");

if( in_array($fruit,$fruits) )

echo "$fruit is already in the array";

1

2

3

4

5

6

$fruit["apple"] = "red";

$fruit["banana"] = "yellow";

$fruit["pear"] = "green";

if(array_key_exists("apple", $fruit)){

printf("apple's color is %s",$fruit["apple"]);

}

The third parameter is optional and forces in_array() to consider the type when searching.

array_key_exists() function

If a specified key is found in an array, the function array_key_exists() returns true, otherwise it returns false. Its form is as follows:

boolean array_key_exists(mixed key,array array);

The following example will search for apple in the array key, and if found, will output the color of the fruit:

1

2

3

1

2

3

4

5

6

$fruits["apple"] = "red";

$fruits["banana"] = "yellow";

$fruits["watermelon"]="green";

$founded = array_search("green", $fruits);

if($founded)

printf("%s was founded on %s.",$founded, $fruits[$founded])

4 5

6

$fruit["apple"] = "red";
$fruit["banana"] = "yellow";

$fruit["pear"] = "green";

if(array_key_exists("apple", $fruit)){

printf("apple's color is %s",$fruit["apple"]);

}

1

2

3

4

5

$fruits["apple"] = "red";

$fruits["banana"] = "yellow";

$fruits["watermelon"]="green";

$keys = array_keys($fruits);

print_r($keys);

The result of executing this code: The code is as follows: apple's color is red array_search() function The array_search() function searches for a specified value in an array and returns the corresponding key if found, otherwise it returns false. Its form is as follows: mixed array_search(mixed needle,array haystack[,boolean strict]) The following example searches $fruits for a specific date (December 7), and if found, returns information about the corresponding state:
1 2 3 4 5 6 $fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $founded = array_search("green", $fruits); if($founded) printf("%s was founded on %s.",$founded, $fruits[$founded])
The results of running the program are as follows: The code is as follows: watermelon was founded on green. array_keys() function The array_keys() function returns an array containing all keys found in the searched array. Its form is as follows: array array_keys(array array[,mixed search_value]) If the optional parameter search_value is included, only keys matching that value will be returned. The following example will output all arrays found in the $fruit array:
1 2 3 4 5 $fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $keys = array_keys($fruits); print_r($keys);

The results of running the program are as follows:

The code is as follows:

Array ( [0] => apple [1] => banana [2] => watermelon )

array_values() function

The

array_values() function returns all values ​​in an array and automatically provides numerical indexes for the returned array. Its form is as follows:

array array_values(array array)

The following example will get the value of each element found in $fruits:

1

2

3

4

5

$fruits["apple"] = "red";

$fruits["banana"] = "yellow";

$fruits["watermelon"]="green";

$values = array_values($fruits);

print_r($values);

1 2

3

4

5
$fruits["apple"] = "red";

$fruits["banana"] = "yellow";$fruits["watermelon"]="green"; $values ​​= array_values($fruits); print_r($values);
The results of running the program are as follows:
The code is as follows:
Array ( [0] => red [1] => yellow [2] => green )
http://www.bkjia.com/PHPjc/1015881.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1015881.htmlTechArticlePHP Find and Search Array Element Method Summary Finding, filtering and searching array elements are some common functions of array operations. Here are some related functions. in_array() function...
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