


How to get the intersection and difference of arrays in PHP, get the intersection of arrays in php_PHP tutorial
How to obtain the intersection and difference of arrays in PHP, how to obtain the intersection and difference of arrays in PHP
The example in this article describes the method of obtaining the intersection and difference of arrays in PHP. Share it with everyone for your reference. The specific analysis is as follows:
1. Intersection of arrays array_intersect()
The array_intersect() function returns a key-preserved array consisting only of values that appear in the first array and appear in every other input array. Its form is as follows:
array array_intersect(array array1,array array2[,arrayN…])
The following example will return all fruits that appear in the $fruit1 array and also appear in $fruit2 and $fruit3:
<?php $fruit1 = array("Apple","Banana","Orange"); $fruit2 = array("Pear","Apple","Grape"); $fruit3 = array("Watermelon","Orange","Apple"); $intersection = array_intersect($fruit1, $fruit2, $fruit3); print_r($intersection); // output // Array ( [0] => Apple ) ?>
The array_intersect() function will consider two elements to be the same only if they are equal and have the same data type.
Intersection of associative arrays array_intersect_assoc()
The function array_intersect_assoc() is basically the same as array_intersect(), except that it also considers the keys of the array in the comparison. Therefore, only key/value pairs that appear in the first array and also appear in all other input arrays are returned in the result array.
The format is as follows:
array array_intersect_assoc(array array1,array array2[,arrayN…])
The following example returns all key/value pairs that appear in the $fruit1 array and also appear in $fruit2 and $fruit3:
<?php $fruit1 = array("red"=>"Apple","yellow"=>"Banana","orange"=>"Orange"); $fruit2 = array("yellow"=>"Pear","red"=>"Apple","purple"=>"Grape"); $fruit3 = array("green"=>"Watermelon","orange"=>"Orange","red"=>"Apple"); $intersection = array_intersect_assoc($fruit1, $fruit2, $fruit3); print_r($intersection); // output // Array ( [red] => Apple ) ?>
2. Difference of arrays array_diff()
The function array_diff() returns values that appear in the first array but not in other input arrays. This function is the opposite of array_intersect().
array array_diff(array array1,array array2[,arrayN…])
Examples are as follows:
<?php $fruit1 = array("Apple","Banana","Orange"); $fruit2 = array("Pear","Apple","Grape"); $fruit3 = array("Watermelon","Orange","Apple"); $intersection = array_diff($fruit1, $fruit2, $fruit3); print_r($intersection); // output // Array ( [1] => Banana ) ?>
Difference of associative arrays array_diff_assoc()
The function array_diff_assoc() is basically the same as array_diff(), except that it also considers the keys of the array when comparing. Therefore, only key/value pairs that appear in the first array but not in the other input arrays are returned in the result array. Its form is as follows:
array array_diff_assoc(array array1,array array2[,arrayN…])
The following example only returns [yellow] => Banana, because this special key/value pair appears in $fruit1, but does not exist in $fruit2 or $fruit3.
<?php $fruit1 = array("red"=>"Apple","yellow"=>"Banana","orange"=>"Orange"); $fruit2 = array("yellow"=>"Pear","red"=>"Apple","purple"=>"Grape"); $fruit3 = array("green"=>"Watermelon","orange"=>"Orange","red"=>"Apple"); $intersection = array_diff_assoc($fruit1, $fruit2, $fruit3); print_r($intersection); // output // Array ( [yellow] => Banana ) ?>
I hope this article will be helpful to everyone’s PHP programming design.

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PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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