Php qr code generation method

Welcome to the Linux community forum and interact with 2 million technical staff. 1. Use google open APIs to complete [php] $ urlToEncodename: Liu xinming, phone: 18792448443; generateQRfromGoogle ($ urlToEncode ); *** googleapi QR code generation [QRcode can store up to 4296 letter and digit types

Welcome to the Linux community forum and interact with 2 million technical staff> 1. Use google open API to complete [php] $ urlToEncode = "name: Liu xinming, phone: 18792448443 "; generateQRfromGoogle ($ urlToEncode);/*** generate a QR code using google api [QRcode can store up to 4296 letters and numbers

Welcome to the Linux community forum and interact with 2 million technicians>

1. Use google to open APIs

[Php]

$ UrlToEncode = "name: Liu xinming, phone: 18792448443 ";

GenerateQRfromGoogle ($ urlToEncode );

/**

* Google api QR code generation [QRcode can store any text of a maximum of 4296 letters/numbers. For details, see the QR code data format]

* @ Param string $ information contained in the chlorophyll QR code, which can be numbers, characters, binary information, and Chinese characters. The data type cannot be mixed and must pass through the UTF-8 URL-encoded. If the information to be passed exceeds 2 K bytes, use the POST Method

* @ Param int $ widhtHeight: set the size of the generated QR code

* @ Param string $ EC_level: the error correction level is optional. The QR code supports four levels of error correction, which is used to restore lost, read, fuzzy, and data.

* L-Default: 7% of lost data can be identified.

* M-identifies 15% of data loss

* Q-identifies 25% of data loss

* H-identifies 30% of data loss

* @ Param int $ the distance between the QR code generated by margin and the image border

*/

Function generateQRfromGoogle ($ chlorophyll, $ widhtHeight = '000000', $ EC_level = 'l', $ margin = '0 ')

{

$ Chlorophyll = urlencode ($ chlorophyll );

Echo '';

}

For more details, see baidu Library: wenku. baidu./view/b2a6ffc60c22590102029dae.html

2. php QR Code library

Php qr Code is open source (LGPL) library for generating QR Code,

2-dimen1_barcode. Based on libqrencode C library,

Provides API for creating QR Code barcode images (PNG, JPEG thanks to GD2 ).

Implemented purely in PHP, with no external dependencies (using t GD2 if needed ).

PS: due to the time relationship, I only tested the Open API of google. Others can be tested by themselves.

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A two-dimensional bar code (2-dimen1_bar code) records data in a certain area of the Plane Based on a specific geometric pattern.

Commonly used Code systems include Data Matrix, Maxi Code, Aztec, QR Code, response Code, limit 417, Ultracode, Code 49, and Code 16K.

①: Stacked/row-arranged two-dimensional bar codes, such as Code 16 K, Code 49, and Code 417 (such ).

②: Matrix qr code is the most popular one.

The two-dimensional code stores a larger amount of data. It can contain numbers, characters, Chinese text, and other mixed content. It has a certain degree of fault tolerance (it can be read normally after some damages). It has a high space utilization rate.

③: Introduction to QR CODE

For example, the basic structure of a qrcode, where:

Location Detection Image, Location Detection Image separator, and positioning image: used to locate the QR code. For each QR code, the location is fixed, but the size and specifications may vary;

Calibration image: the specification is determined, and the quantity and position of the correction image are also determined;

Format information: indicates the error correction level for modifying the QR code, which can be L, M, Q, and H;

Version information: the type of the QR code. There are 40 types of matrix (generally black and white), from 21x21 (version 1 ), to 177x177 (version 40), each version adds four modules to each side of the previous version.

Data and Error Correction Code: the information of the actually saved QR code, and the error code (used to correct the error caused by damage to the QR code ).

Brief Encoding Process:

1. data analysis: determines the encoding character type and converts it to a symbolic character based on the corresponding character set. If an error correction level is selected, the higher the error correction level, the smaller the actual data capacity.

2. Data Encoding: converts a data character into a bitstream. Each 8-bit code word represents a code word sequence of data. In fact, the data content of the QR code is known as the data code sequence.

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