Detailed introduction and usage of in_array function

PHP performance is constantly improving. However, if you use it improperly or if you are not careful, you may still step into the pitfalls of PHP's internal implementation. I encountered a performance problem a few days ago and the performance of PHP has been improving. However, if you use it improperly or if you are not careful, you may still step into the pitfalls of PHP's internal implementation. I encountered a performance problem a few days ago. Here's what happened. A colleague reported that one of our interfaces took 5 seconds to return each time. We reviewed the code together and were "surprised" to find that a read cache operation was called in the loop (about 900 times). , and the cached key has not changed, so we moved this code outside the loop and tested again. The interface return time dropped to 2 seconds, woohoo! Although it has doubled, it is obviously not a result we can accept! The amount of code that caused the performance problem was not large. After we eliminated the IO problem, we wrote a piece of test code, and sure enough, the problem reappeared quickly. Copy the code. The code is as follows:

1. Encountering the low performance problem of PHP's in_array

Introduction: The performance of PHP has been improving. However, if you use it improperly or if you are not careful, you may still step into the pitfalls of PHP's internal implementation. I encountered a performance problem a few days ago

2. Detailed explanation of in_array in php

Introduction: This article mainly shares with you the detailed explanation of in_array in php, mainly in the form of code, hoping to help everyone.

3. How to use implicit conversion of in_array

Introduction: This time I will show you how to use the implicit conversion of in_array, and what are the precautions for using the implicit conversion of in_array. The following is a practical case, let's take a look.

4. in_array in php compares the same values ​​in the array and splices the arrays

Introduction: This article mainly shares with you how in_array in PHP compares the same values ​​in the array and splices the arrays. I hope it can help you.

5. Detailed explanation of implicit conversion examples of in_array in PHP

Introduction: When writing an interface today, I need to pass in a large number of basic information parameters. The parameters are of two types: int and string. For the convenience of verification, I plan to put all parameters in an array. , then use in_array(0, $param) to determine whether the int parameter is 0, and then separately determine whether the string parameter is empty. The sample code is as follows:

6. In JavaScript Detailed explanation of how to use in_array function to determine array usage

##Introduction: To determine whether a value is in an array in JS There is no function used directly in PHP. For example, there is the in_array() function in PHP. But we can write a function like in_array() to determine whether a value is in the function. /*** JS determines whether a value exists in an array*/ // Define a judgment function var in_array = function(arr){ // Determine whether the parameter is an array

7. php in_array function check Whether a certain value exists in the array

Introduction: This article mainly introduces the use of the in_array function in PHP to check whether a certain value exists in the array, and analyzes the in_array function in more detail The functions, definitions and related usage techniques and precautions have certain reference value. Friends in need can refer to the following

8. Usage of in_array function in php

Introduction: This article mainly introduces the usage of in_array function in php, and the parameters of in_array function The usage of matching has been explored in depth, which will help to fully understand the usage of in_array function. Friends in need can refer to

9. php: foreach and in_array Detailed explanation of usage examples

Introduction: PHP is very efficient in development, which is understandable, but it is at the expense of execution efficiency. The PHP array function is very powerful, but you should also consider it more and try several situations just in case. Here, I will briefly mention the two pitfalls encountered. If you find more in the future, please add them!

10. How to deal with the low performance of in_array in php

Introduction: PHP performance is constantly improving. However, if you use it improperly or if you are not careful, you may still step into the pitfalls of PHP's internal implementation. Here's what happened. A colleague reported that one of our interfaces took 5 seconds to return every time. We reviewed the code together and got "Surprise

11. in_array( )’s 10 content recommendations

##Introduction: The example in this article tells how php gets the number of days and days of the month based on the year and month Date array method. Share it with everyone for your reference, as follows: function get_day( $date )  {    $tem = explode(' -' , $date); //

12. Recommended 10 articles about in_array()

##Introduction: This article describes the method of obtaining the number of days of the month and date array in PHP based on the year and month, sharing it with you for your reference. The details are as follows: function get_day( $date )  {    $tem = explode('-' , $date ); //

13.

10 recommended articles about in_array()

Introduction: The example in this article describes the method of obtaining the day of the month and date array in PHP based on the year and month. The details are as follows: function get_day( $date  )  {    $tem = explode('-' , $date); //

14.

10 recommended articles about php in_array() function

Introduction: The example in this article describes how PHP obtains the day of the month and the date array based on the year and month. It is shared with everyone for your reference. The details are as follows: function get_day( $date )  {     $tem = explode('-' , $date); //

##15.

php in_array syntax

##Introduction: This article pays attention to the introduction of php in_array syntax

16. A brief discussion on the use of foreach/in_array in PHP

Introduction: This article gives you a brief summary of the use of foreach and in_array in PHP, including information on common problems encountered in use. It is very practical and friends in need can refer to it.

17. A brief discussion on the use of foreach/in_array in PHP

Introduction: This article gives you a brief summary of the use of foreach and in_array in PHP, including information about common problems encountered in use. It is very practical and friends in need can refer to it.

18. php array function sequence in_array() finds whether the array value exists

Introduction: in_array() function searches for a given value in an array

19. Notes on using the PHP IN_ARRAY function

Introduction: In fact, the key is because PHP is a weakly typed language. It is best to use the strict method when comparing PHP of. Because this not only compares whether the values ​​​​of the two are consistent, but also compares whether the types of the two are consistent.

20. Custom method of in_array function similar to php's js array

Introduction: PHP's array function in_array() is very convenient. Here I will introduce you to the in_array function of customizing a JS array similar to PHP. The specific implementation method is as follows. Interested friends can refer to it

21. Use js to determine whether an array contains an element (similar to in_array() in php)

Introduction: This article is mainly for friends who need to use js to determine whether an array contains a certain element (similar to in_array() in php). You can come here for reference. Next, I hope it will be helpful to everyone

22. 2 customized PHP in_array functions to solve the efficiency problem of judging in_array from large amounts of data

Introduction: You may have used in_array to determine whether a data is in an array. Generally, our arrays may have relatively small data. It has no impact on performance, so I don’t care too much

23. Encountered the low performance problem of in_array in php

Introduction: PHP performance is constantly improving. However, if you use it improperly or if you are not careful, you may still step into the pitfalls of PHP's internal implementation. I encountered a performance problem a few days ago

24. php array function sequence in_array() - Find whether the specified value exists in the array

Introduction: in_array() definition and usage in_array() function finds whether the specified value exists in the array

25. Detailed explanation of the use of PHP function in_array()

Introduction: This article mainly introduces the detailed explanation of the use of PHP function in_array(), respectively for ordinary use, Examples are given using the third parameter, cloned objects, multi-dimensional arrays, etc. Friends in need can refer to

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