10 Recommendations for unique articles

Our previous article described how to delete headers, tails, arbitrary elements in the PHP array, and this article tells us to delete the repeating elements in the array by using the Array_unique () function. The Array_unique () function, which sorts the values of an array element as a string and then retains only the first key name for each value, ignores all subsequent key names, or deletes the duplicate elements in the array, with the following syntax: Array arry_unique (array array) parameters Array is the input. The following example causes the Array_unique () function to delete the repeating element in the array, with the following example code: <?phpheader ("content-type:text/html; Charset=utf-8 "); $array _push = Array (" topic.alibabacloud.com "," www.php.cn ", &amp

1. The article about Array_unique () recommended 10 articles

Introduction: Our previous article on how to delete the PHP array in the head, tail, arbitrary elements, this article we tell through the Array_unique () function to delete the array of repeating elements. The Array_unique () function, which sorts the values of an array element as a string and then retains only the first key name for each value, ignores all subsequent key names, or removes duplicate elements in the array, with the following syntax: Array&nbsp;arry_unique (array &nbsp;array) parameter array for the input arrays ...

2. About PHP Array_unique () functions 10 articles recommended

Introduction: Our previous article on how to delete the PHP array in the head, tail, arbitrary elements, this article we tell through the Array_unique () function to delete the array of repeating elements. The Array_unique () function, which sorts the values of an array element as a string and then retains only the first key name for each value, ignores all subsequent key names, or removes duplicate elements in the array, with the following syntax: Array&nbsp;arry_unique (array &nbsp;array) parameter array for the input arrays ...

3. How MySQL uses unique to achieve a detailed introduction to data non-repeatable inserts

Summary: When a unique column inserts a record with duplicate values on a unique key, we can control how MySQL handles this situation: Use the Ignore keyword or the on DUPLICATE key update clause to skip INSERT, Break the operation or update the old record to a new value.

4. Parsing three types of INSERT statements commonly used in MySQL and their differences

Introduction: MySQL commonly used in three kinds of data inserted statements: INSERT into represents the insertion of data, the database will check the primary key (PrimaryKey), if there is a repetition of the error; Replace into means insert replacement data, the requirements table has PrimaryKey, Or a unique index, if the database already exists data, replace with the new data, if there is no data effect and insert into the same, and the Replace statement will return a number to indicate the affected

5. How to delete duplicate elements in a PHP array

Summary: the Array_unique () function, which sorts the values of an array element as a string, and then retains only the first key name for each value, ignoring all subsequent key names, or deleting duplicate elements in the array.

6. A detailed example of how Python generates a unique ID using the UUID library

Introduction: UUID Introduction UUID is a globally unique identifier of 128 bits, typically represented by a 32-byte string. It guarantees the uniqueness of time and space, also known as the GUID, called the UUID in the uuid――universally unique Identifier,python. It guarantees the uniqueness of the generation ID by MAC address, timestamp, namespace, random number, pseudo-random number. The UUID consists of five algorithms, which is five

7. mysql-Introduction to several ways to add an index

Introduction: 1. Add PRIMARY key (primary key index) Mysql>alter TABLE ' table_name ' Add PRIMARY KEY (' column ') 2. Add unique (unique index) Mysql>alter TA BLE ' table_name ' Add UNIQUE (' column ') 3. Add index (normal index) mysql>alter table ' t

8. Share a workaround for MySQL deadlock problem

Summary: Share a MySQL deadlock problem resolution method and try to create a unique (unique index) with tel_id and task_id two fields to address

9. mysql Deadlock Problem resolution code detailed description

Summary: Based on this analysis, try to resolve by creating a unique (unique index) of two fields tel_id and task_id. (You can also query it first, and then update it based on the primary key ID, so it doesn't affect the online business because of the large amount of data in the table).

C++11 Smart pointers for new features (SHARED_PTR/UNIQUE_PTR/WEAK_PTR)

Introduction: This article mainly introduces the c++11 new features of smart pointers, including shared_ptr, Unique_ptr and weak_ptr Basic use, interested in small partners can refer to

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