Article recommendation about string function Crc32 ()

PHP Learning Series (1)--String processing function (3), PHP function 11, CRC32 () function computes the crc32 polynomial of a string. A 32-bit cyclic redundancy check code polynomial that generates a string parameter. This function can be used to verify the integrity of the data. Syntax: CRC32 (String) Note: Because the integers in PHP are signed, many CRC32 checksums will return a negative integer, so you need to use the "%u" format of sprintf () or printf () to get a string that represents the unsigned CRC32 check code. Example 1 in this example, we will output the results of CRC32 () without using the "%u" format character (note the result is the same): output: Without%u:461707669with%u:461707669 Example 2 in this case, We will output the results of CRC32 () in the case of using and not using the "%u" format character (note the result is not the same): output:

1. PHP Learning Series (1)--String processing function (3), PHP function _php Tutorial

Introduction: PHP Learning Series (1)--String processing function (3), PHP function. PHP Learning Series (1)--String processing function (3), PHP function 11, CRC32 () function computes the crc32 polynomial of a string. 32-bit cyclic redundancy check code that generates a string parameter

2. PHP CRC-16 code, use! How to solve it

Introduction: Request PHP CRC-16 code, Emergency!!! Send data to the device, need CRC 16-bit check code, Google for half a day, did not find PHP written CRC16 code. PHP comes with the CRC32 () function to generate only 32-bit checksums, but I need a 16-bit checksum, because the device only knows the 16-bit checksum code. The environment is UBUNTU+APACHE2+PHP5+MYSQL5+ADODB. If there are other languages written in the CRC 16 algorithm, than

3. Solving the application scenario for the CRC32 () function

Introduction: Solve the application scenario of CRC32 () function to solve the application scenario of CRC32 () function, look at the manual is very confused, do not know what this function is used to solve. The best------solution for an Application scenario--------------------manual Description: 32-bit cyclic redundancy check code polynomial for generating str. This is typically used to check the integrity of the data being transmitted.

4. Solving the application scenario for the CRC32 () function

Introduction: Solve the application scenario of CRC32 () function to solve the application scenario of CRC32 () function, look at the manual is very confused, do not know what this function is used to solve. The best------solution for an Application scenario--------------------manual Description: 32-bit cyclic redundancy check code polynomial for generating str. This is typically used to check the integrity of the data being transmitted.

5. PHP CRC-16 code, use! How to solve it

Introduction: Request PHP CRC-16 code, Emergency!!! Send data to the device, need CRC 16-bit check code, Google for half a day, did not find PHP written CRC16 code. PHP comes with the CRC32 () function to generate only 32-bit checksums, but I need a 16-bit checksum, because the device only knows the 16-bit checksum code. The environment is UBUNTU+APACHE2+PHP5+MYSQL5+ADODB. If there are other languages written in the CRC 16 algorithm, than

6. PHP Learning Series (1) String processing function (3), PHP function

Introduction: PHP Learning Series (1)--String processing function (3), PHP function. PHP Learning Series (1)--String processing function (3), PHP function 11, CRC32 () function computes the crc32 polynomial of a string. 32-bit cyclic redundancy check code that generates a string parameter