


Summary of methods to generate QR codes using PHP, PHP summary_PHP tutorial
A summary of methods for generating QR codes using PHP, a summary of php
With the advancement of technology, the application fields of QR codes are becoming more and more extensive. This site has previously introduced articles By using the jQuery plug-in to generate QR codes, today I will share with you how to use PHP to generate QR codes, and how to generate QR codes with a LOGO image in the middle.
Use Google API to generate QR code
Google provides a relatively complete QR code generation interface. It is very simple to call the API interface. The following is the calling code:
$urlToEncode="http://www.bkjia.com"; generateQRfromGoogle($urlToEncode); /** * google api 二维码生成【QRcode可以存储最多4296个字母数字类型的任意文本,具体可以查看二维码数据格式】 * @param string $chl 二维码包含的信息,可以是数字、字符、二进制信息、汉字。 不能混合数据类型,数据必须经过UTF-8 URL-encoded * @param int $widhtHeight 生成二维码的尺寸设置 * @param string $EC_level 可选纠错级别,QR码支持四个等级纠错,用来恢复丢失的、读错的、模糊的、数据。 * L-默认:可以识别已损失的7%的数据 * M-可以识别已损失15%的数据 * Q-可以识别已损失25%的数据 * H-可以识别已损失30%的数据 * @param int $margin 生成的二维码离图片边框的距离 */ function generateQRfromGoogle($chl,$widhtHeight ='150',$EC_level='L',$margin='0') { $chl = urlencode($chl); echo '<img src="/static/imghwm/default1.png" data-src="jb51.png" class="lazy".$widhtHeight.'x'.$widhtHeight.' &cht=qr&chld='.$EC_level.'|'.$margin.'&chl='.$chl.'" alt="QR code" widhtHeight="'.$widhtHeight.' " widhtHeight="'.$widhtHeight.'"/>'; }
Use PHP QR code generation library PHP QR Code to generate QR code
PHP QR Code is a PHP QR code generation library that can be used to easily generate QR codes. The official website provides downloads and multiple demonstration demos. View address: http://phpqrcode.sourceforge.net/.
After downloading the class library provided by the official website, you only need to use phpqrcode.php to generate the QR code. Of course, your PHP environment must enable GD2 support. phpqrcode.php provides a key png() method, in which the parameter $text indicates the generation of two-digit information text; the parameter $outfile indicates whether to output a QR code image file, the default is no; the parameter $level indicates the fault tolerance rate, that is The covered areas can still be identified, which are L (QR_ECLEVEL_L, 7%), M (QR_ECLEVEL_M, 15%), Q (QR_ECLEVEL_Q, 25%), H (QR_ECLEVEL_H, 30%); the parameter $size indicates the size of the generated image , the default is 3; the parameter $margin indicates the spacing value of the blank area of the border around the QR code; the parameter $saveandprint indicates whether to save the QR code and display it.
public static function png($text, $outfile=false, $level=QR_ECLEVEL_L, $size=3, $margin=4, $saveandprint=false) { $enc = QRencode::factory($level, $size, $margin); return $enc->encodePNG($text, $outfile, $saveandprint=false); }
Calling PHP QR Code is very simple. The following code can generate a QR code with the content "http://www.bkjia.com".
include 'phpqrcode.php'; QRcode::png('http://www.bkjia.com');
In actual application, we will add our own LOGO in the middle of the QR code to enhance the publicity effect. So how to generate a QR code containing a logo? In fact, the principle is very simple. First use PHP QR Code to generate a QR code image, and then use PHP's image related function to add the pre-prepared logo image to the middle of the original QR code image just generated, and then regenerate a new one. QR code picture.
include 'phpqrcode.php'; $value = 'http://www.bkjia.com'; //二维码内容 $errorCorrectionLevel = 'L';//容错级别 $matrixPointSize = 6;//生成图片大小 //生成二维码图片 QRcode::png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2); $logo = 'logo.png';//准备好的logo图片 $QR = 'qrcode.png';//已经生成的原始二维码图 if ($logo !== FALSE) { $QR = imagecreatefromstring(file_get_contents($QR)); $logo = imagecreatefromstring(file_get_contents($logo)); $QR_width = imagesx($QR);//二维码图片宽度 $QR_height = imagesy($QR);//二维码图片高度 $logo_width = imagesx($logo);//logo图片宽度 $logo_height = imagesy($logo);//logo图片高度 $logo_qr_width = $QR_width / 5; $scale = $logo_width/$logo_qr_width; $logo_qr_height = $logo_height/$scale; $from_width = ($QR_width - $logo_qr_width) / 2; //重新组合图片并调整大小 imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height); } //输出图片 imagepng($QR, 'jb51.png'); echo '<img src="/static/imghwm/default1.png" data-src="jb51.png" class="lazy" alt="Summary of methods to generate QR codes using PHP, PHP summary_PHP tutorial" >';
Because QR codes allow a certain degree of fault tolerance, general QR codes can still be decoded even if they are partially covered. Often when we scan a QR code, we can decode the scan result even less than halfway through. This is because the generator will repeatedly represent part of the information to improve its fault tolerance. This is why adding a LOGO image in the middle of the QR code does not affect the decoding results.
The above is the entire content of this article. I hope it will be helpful for everyone to master the production of QR codes in PHP.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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