How to find different values in two arrays in php
As a widely used programming language, PHP often needs to compare different values between two arrays when processing arrays. This article will introduce some PHP methods to find out the different values of two arrays.
Method 1: Use array_diff() function
array_diff() function is very useful when comparing different values between two arrays. It is used as follows:
<?php $array1 = array("a" => "apple", "b" => "banana", "c" => "cherry", "d" => "date"); $array2 = array("a" => "apple", "b" => "banana", "g" => "grape"); $result = array_diff($array1, $array2); print_r($result); ?>
In the above code, We define two arrays $array1 and $array2, and find values from $array1 that are different from $array2. It will return which values exist in $array1 but not in $array2. The output result should be:
Array ( [c] => cherry [d] => date )
Method 2: Use array_udiff() function
If the array elements we need to compare are not just simple values, but also require more advanced comparisons, we need to use array_udiff () function, which allows us to use a custom callback function for comparison. The usage is as follows:
<?php function compare($x, $y) { if ($x === $y) { return 0; } return ($x > $y) ? 1 : -1; } $array1 = array("apple", "banana", "cherry", "date"); $array2 = array("apple", "banana", "grape"); $result = array_udiff($array1, $array2, "compare"); print_r($result); ?>
In the above code, we define a comparison callback function compare(), which is used to compare the size relationship between two elements and return the original array element. Next, we use the array_udiff() function, passing in two arrays and a custom callback function, which returns the elements that exist in the first array and the elements that do not exist in the second array. The output result should be:
Array ( [2] => cherry [3] => date )
Method 3: Use array_diff_key() function
If we only need to compare the keys (keys) of two arrays, rather than the values (values), we can use array_diff_key ()function. It will return values with mismatched keys in both arrays. The usage is as follows:
<?php $array1 = array("a" => "apple", "b" => "banana", "c" => "cherry"); $array2 = array("a" => "apple", "b" => "banana", "d" => "date"); $result = array_diff_key($array1, $array2); print_r($result); ?>
In the above code, we compare the keys of the two arrays and return the value of the key value in $array1 that is different from $array2. The output result should be:
Array ( [c] => cherry )
Method 4: Use the array_udiff_assoc() function
If we need to compare different values of two multi-dimensional arrays, we need to use the array_udiff_assoc() function, which is used in the same way as array_udiff( ) function is similar, except that it supports comparison of multi-dimensional arrays. The usage is as follows:
<?php function compare($x, $y) { if ($x === $y) { return 0; } return ($x > $y) ? 1 : -1; } $array1 = array("a" => "apple", "b" => "banana", "c" => "cherry"); $array2 = array("a" => "apple", "b" => "banana", "d" => "date"); $result = array_udiff_assoc($array1, $array2, "compare"); print_r($result); ?>
In the above code, we define a callback function compare() for comparing multi-dimensional array elements, and the usage is similar to method two. We pass in two multidimensional arrays and use the callback function to compare them. The result returns the elements that exist in $array1 but not in $array2. The output should be:
Array ( [c] => cherry )
Conclusion
PHP provides a very rich function to compare different values between two arrays. We can use the array_diff() or array_udiff() function to compare different values between ordinary arrays, use the array_diff_key() function to compare different values between arrays with different key values, and use the array_udiff_assoc() function to compare multi-dimensional arrays. of different values. Mastering the use of these functions will greatly help us process data during PHP development.
The above is the detailed content of How to find different values in two arrays in php. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

The article discusses symmetric and asymmetric encryption in PHP, comparing their suitability, performance, and security differences. Symmetric encryption is faster and suited for bulk data, while asymmetric is used for secure key exchange.

The article discusses implementing robust authentication and authorization in PHP to prevent unauthorized access, detailing best practices and recommending security-enhancing tools.

The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand

Article discusses best practices for PHP input validation to enhance security, focusing on techniques like using built-in functions, whitelist approach, and server-side validation.

The article discusses strategies to prevent CSRF attacks in PHP, including using CSRF tokens, Same-Site cookies, and proper session management.
