Detailed introduction to array_flip function

The method is as follows: $arr = array(…………);//Suppose there is an array of 10,000 elements with repeated elements. $arr = array_flip(array_flip($arr)); //This will remove duplicate elements. What the hell is going on? Let’s look at the function of array_flip(): array_flip() is used to exchange the key and value of each element of an array, such as: $arr1 = array ("age" => 30, "name" => "Happy Garden"); $arr2 = array_flip($arr1); //$arr2 is array(30 => "age", "Happy Garden" => "name"); In PHP arrays, different elements are allowed The same value can be taken, but the same key name is not allowed to be used by different elements, such as: $arr1 = array ("age" =&

1. php array_flip() Delete Array Duplicate Elements

Introduction: In PHP, there is an available method for deleting duplicate elements in an array. function, that is array_unique(), but it is not the most efficient method. Using the array_flip() function will be about five times faster than array_uniqure()

2. . php uses the array_flip() function to delete duplicate elements in the array

##Introduction: Summary: In PHP, there is a function available to delete duplicate elements in an array, which is array_unique(), but it is not the most efficient method. Using the array_flip() function will be about five times faster than array_unique(). ..

3. PHP introductory tutorial array function operation complete php introductory tutorial pdf php introductory programming tutorial canphp introductory tutorial

Introduction: PHP introductory tutorial, array function: PHP introductory tutorial - A complete list of array function operations: Today we compiled a complete list of array operations in PHP development, including basic functions of array operations, array segmentation and filling, array and There are a total of 8 knowledge points on stack, array and queue, callback function, sorting, calculation, and other array functions. It is very suitable for beginners who are learning PHP. You are welcome to collect and take it away. 1. The key names and array_values ​​of the basic functions of array operations. ($arr); Get the array_keys($arr); Get the key name of the array array_flip($arr); Interchange with the key name in the array (if there are duplicates

4 . nba2k online shooting skills PHP tips exchange the keys and values ​​of the array to form a new array, search for the value and get the key

##Introduction: nba2k online shooting skills: nba2k online shooting skills php tips exchange the keys and values ​​of the array to form a new array, find the value and get the key: copy the code as follows: $cityname = array_flip($city_DB[name]); //Exchange the keys and values ​​of the array The exchange forms a new array $city_name = array_search($city_id,$cityname,true); //Find the value and get the key

5.

arrays.sort PHP array_flip delete duplicates Special function for array elements

Introduction: arrays.sort:arrays.sort PHP array_flip Special function for deleting duplicate array elements: Description array array_flip (array trans) 　array_flip() returns an inverse In the converted array, for example, the key names in trans become values, and the values ​​in trans become key names. Note that the value in trans needs to be a legal key name, for example, it needs to be integer or string. A warning will be emitted if the value is of the wrong type, and the key/value pair in question will not be reversed. If the same value appears multiple times

6.

pimchanok leuwisetpaiboon PHP array learning sorting full contact page 1/2

Introduction: pimchanok leuwisetpaiboon:pimchanok leuwisetpaiboon PHP Array Learning Sorting Full Contact Page 1/2: array_values($arr) array Returns all elements of the array Copy code The code is as follows:

7.

array_slice and array_flip in php array function

Introduction:: array_slice and array_flip in php array function: first look at array_slice. The function of array_slice is to take out a part of the array. There are two usages: $arr=array(a=>aa,b= >bb,c=>cc,d=>dd);//Starting from the first data in the array (the array itself starts from 0), take two items. $tmp=array_slice($arr,1,2); showObj($tmp); //Start from the third last data in the array and take the next two items: $tmp=array_sl

8. php array_flip() Delete duplicate elements from array_PHP tutorial

Introduction: php array_flip() removes duplicate elements from an array. The method is as follows: $arr = array(…………);//Suppose there is an array of 10,000 elements with repeated elements. $arr = array_flip(array_flip($arr)); //This will remove duplicate elements.

9. PHP Array Learning Sorting Full Contact Page 1/2_PHP Tutorial

Introduction: PHP Array Learn to sort all contact pages 1/2. array_values($arr) array returns all elements of the array. Copy the code as follows: ?php $arr = array("a", "b", "c"); $arr = array_flip($arr); //Reverse the array The current $arr of the subscript and value =

##10. PHP array_flip() Special function to delete duplicate array elements_PHP tutorial

Introduction: PHP array_flip() is a special function for deleting duplicate array elements. Description array array_flip (array trans) array_flip() returns a reversed array, for example, the key names in trans become values, and the values ​​in trans become key names. Note the value in trans

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