Detailed introduction to array_diff

Give you two arrays with 5000 elements each, and calculate their difference. To put it bluntly, it means using PHP and the algorithm you think is the best to implement the array_diff algorithm. When I received this question for the first time, I found it to be very simple, so I wrote one based on my past experience: function array_diff($array_1, $array_2) { $diff = array(); ​ foreach ($array_1 as $k => $v1) { $flag =&nbs

1. The difference between array_diff and other methods to implement PHP array traversal

Introduction: Give you two arrays with 5000 elements each, and calculate their difference set. To put it bluntly, it means using PHP and the algorithm you think is the best to implement the array_diff algorithm. When I received this question for the first time, I found it to be very simple, so I wrote one based on my past experience:

2. Definition and usage of PHP array_diff_key() function

Introduction: Definition and usage The array_diff_key() function is used to compare two (or more) arrays key name and return the difference set. This function compares the keys of two (or more) arrays and returns a difference array that includes all keys in the compared array (array1) but not in any of the other argument arrays (array2 or array3, etc. ) in the key name. Syntax array_diff_key(array1,array2,array3...);

##3. PHP array_diff_ukey() function definition and usage

Introduction: Definition and usage The array_diff_ukey() function is used to compare the key names of two (or more) arrays and return the difference. Note: This function uses a user-defined function to compare key names! This function compares the keys of two (or more) arrays and returns a difference array that includes all keys in the compared array (array1) but not in any of the other argument arrays (array2 or array3, etc. ) in the key name. Syntax

4. Definition and usage of php array_diff function

Introduction: array_diff() Function meaning: The array_diff() function returns the difference array of two arrays. This array contains all keys that are in the array being compared, but are not in any of the other parameter arrays. In the returned array, the key names remain unchanged. For example:

5. Detailed explanation of the timeout BUG problem of PHP's array_diff() function when processing large arrays

Introduction: The array_diff() function of PHP 5.2.6 and above takes an extremely long time when processing large arrays. This bug has been officially confirmed; in this Before the problem is fixed or when we cannot control the PHP version, we can use the method provided in this article

6. Definition and usage of array_diff_assoc() function in php

Introduction: Definition and Usage The array_diff_assoc() function is used to compare the keys of two (or more) arrays name and key value, and returns the difference. This function compares the keys and values ​​of two (or more) arrays and returns a difference array that includes all elements in the compared array (array1) but not in any of the other argument arrays (array2 or array3 etc.) in the key name and key value.

7. Comparison of array_diff_assoc and array_diff function instances in PHP

## Introduction: I talked about array_diff before, this time it is its upgraded version, the PHP array difference comparison array_diff_assoc function is used to compare the differences between keys and values ​​in different arrays and output them according to the index array. The usage syntax is the same as array_diff

8. php array_diff usage example

Introduction: Sharing examples of using php array_diff

9. Notes on the array_diff function

Introduction:: This article mainly introduces the precautions of the array_diff function. Students who are interested in PHP tutorials can refer to it.

10. serializearray The efficiency problem of PHP's array_diff function when processing large arrays

Introduction: serializearray:serializearray The efficiency problem of PHP's array_diff function when processing large arrays: cisa submitted it to the PHP official BUG page. The method to copy the code is as follows:

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