There are several ways to generate a QR code, the fastest way is to use Google’s API. It's a pity that Google is blocked and it doesn't work very well in many cases. Now let’s talk about a more useful method.
For detailed documentation and code, please go to http://phpqrcode.sourceforge.net/.
The following is a simplified version, which automatically generates a QR code based on the written information. and save it to the specified directory.
The main program code
<?php include "./phpqrcode/qrcode.php"; //导入主文件 $PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'qrcode'.DIRECTORY_SEPARATOR;//文件保存目录 $PNG_WEB_DIR = 'qrcode/';//用于预览 if (!file_exists($PNG_TEMP_DIR)) mkdir($PNG_TEMP_DIR); $data = "test";//二维码写入内容 $errorCorrectionLevel = 'L';//错误处理级别 $matrixPointSize = 6;//二维码尺寸大小 //md5加密生成文件名,data可以使用数据库id或者其他唯一标识符 $filename = $PNG_TEMP_DIR.md5($data.'|'.$errorCorrectionLevel.'|'.$matrixPointSize).'.png'; //使用QRcode类生成二维码,文件保存在PNG_TEMP_DIR下 QRcode::png($data, $filename, $errorCorrectionLevel, $matrixPointSize, 2); //图片预览 echo '<img src="/static/imghwm/default1.png" data-src="'.$PNG_WEB_DIR.basename($filename).'" class="lazy" / alt="php QR code generation" ><hr>'; ?>
cannot add attachments, so I am forced to paste the code below. . . Copy the following long code into a new file and name it qrcode.php. Run the above code to generate a QR code. . . .
Post two generated QR codes
php class files (from http://phpqrcode.sourceforge.net/)
<?php /* * PHP QR Code encoder * * This file contains MERGED version of PHP QR Code library. * It was auto-generated from full version for your convenience. * * This merged version was configured to not requre any external files, * with disabled cache, error loging and weker but faster mask matching. * If you need tune it up please use non-merged version. * * For full version, documentation, examples of use please visit: * * http://phpqrcode.sourceforge.net/ * https://sourceforge.net/projects/phpqrcode/ * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ /* * Version: 1.1.4 * Build: 2010100721 */ //---- qrconst.php ----------------------------- /* * PHP QR Code encoder * * Common constants * * Based on libqrencode C library distributed under LGPL 2.1 * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi> * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ // Encoding modes define('QR_MODE_NUL', -1); define('QR_MODE_NUM', 0); define('QR_MODE_AN', 1); define('QR_MODE_8', 2); define('QR_MODE_KANJI', 3); define('QR_MODE_STRUCTURE', 4); // Levels of error correction. define('QR_ECLEVEL_L', 0); define('QR_ECLEVEL_M', 1); define('QR_ECLEVEL_Q', 2); define('QR_ECLEVEL_H', 3); // Supported output formats define('QR_FORMAT_TEXT', 0); define('QR_FORMAT_PNG', 1); class qrstr { public static function set(&$srctab, $x, $y, $repl, $replLen = false) { $srctab[$y] = substr_replace($srctab[$y], ($replLen !== false)?substr($repl,0,$replLen):$repl, $x, ($replLen !== false)?$replLen:strlen($repl)); } }//---- merged_config.php ----------------------------- /* * PHP QR Code encoder * * Config file, tuned-up for merged verion */ define('QR_CACHEABLE', false); // use cache - more disk reads but less CPU power, masks and format templates are stored there define('QR_CACHE_DIR', false); // used when QR_CACHEABLE === true define('QR_LOG_DIR', false); // default error logs dir define('QR_FIND_BEST_MASK', true); // if true, estimates best mask (spec. default, but extremally slow; set to false to significant performance boost but (propably) worst quality code define('QR_FIND_FROM_RANDOM', 2); // if false, checks all masks available, otherwise value tells count of masks need to be checked, mask id are got randomly define('QR_DEFAULT_MASK', 2); // when QR_FIND_BEST_MASK === false define('QR_PNG_MAXIMUM_SIZE', 1024); // maximum allowed png image width (in pixels), tune to make sure GD and PHP can handle such big images //---- qrtools.php ----------------------------- /* * PHP QR Code encoder * * Toolset, handy and debug utilites. * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ class QRtools { //---------------------------------------------------------------------- public static function binarize($frame) { $len = count($frame); foreach ($frame as &$frameLine) { for($i=0; $i 1) { $eccLevel = $mode[1]; } $qrTab = QRcode::text($code, false, $eccLevel); $size = count($qrTab); $barcode_array['num_rows'] = $size; $barcode_array['num_cols'] = $size; $barcode_array['bcode'] = array(); foreach ($qrTab as $line) { $arrAdd = array(); foreach(str_split($line) as $char) $arrAdd[] = ($char=='1')?1:0; $barcode_array['bcode'][] = $arrAdd; } return $barcode_array; } //---------------------------------------------------------------------- public static function clearCache() { self::$frames = array(); } //---------------------------------------------------------------------- public static function buildCache() { QRtools::markTime('before_build_cache'); $mask = new QRmask(); for ($a=1; $a makeMaskNo($maskNo, $width, $frame, $bitMask, true); }QRtools::markTime('after_build_cache'); } //---------------------------------------------------------------------- public static function log($outfile, $err) { if (QR_LOG_DIR !== false) { if ($err != '') { if ($outfile !== false) { file_put_contents(QR_LOG_DIR.basename($outfile).'-errors.txt', date('Y-m-d H:i:s').': '.$err, FILE_APPEND); } else { file_put_contents(QR_LOG_DIR.'errors.txt', date('Y-m-d H:i:s').': '.$err, FILE_APPEND); } } } } //---------------------------------------------------------------------- public static function dumpMask($frame) { $width = count($frame); for($y=0;$y <thead><tr style="border-bottom:1px solid silver"><td colspan="2" style="text-align:center">BENCHMARK</td></tr></thead> <tbody>'; foreach($GLOBALS['qr_time_bench'] as $markerId=>$thisTime) { if ($p > 0) { echo '<tr> <th style="text-align:right">till '.$markerId.': </th> <td>'.number_format($thisTime-$lastTime, 6).'s</td> </tr>'; } else { $startTime = $thisTime; } $p++; $lastTime = $thisTime; } echo '</tbody> <tfoot> <tr style="border-top:2px solid black"> <th style="text-align:right">TOTAL: </th> <td>'.number_format($lastTime-$startTime, 6).'s</td> </tr> </tfoot> '; } }//########################################################################## QRtools::markTime('start'); //---- qrspec.php ----------------------------- /* * PHP QR Code encoder * * QR Code specifications * * Based on libqrencode C library distributed under LGPL 2.1 * Copyright (C) 2006, 2007, 2008, 2009 Kentaro Fukuchi <fukuchi> * * PHP QR Code is distributed under LGPL 3 * Copyright (C) 2010 Dominik Dzienia <deltalab at poczta dot fm> * * The following data / specifications are taken from * "Two dimensional symbol -- QR-code -- Basic Specification" (JIS X0510:2004) * or * "Automatic identification and data capture techniques -- * QR Code 2005 bar code symbology specification" (ISO/IEC 18004:2006) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ define('QRSPEC_VERSION_MAX', 40); define('QRSPEC_WIDTH_MAX', 177); define('QRCAP_WIDTH', 0); define('QRCAP_WORDS', 1); define('QRCAP_REMINDER', 2); define('QRCAP_EC', 3); class QRspec { public static $capacity = array( array( 0, 0, 0, array( 0, 0, 0, 0)), array( 21, 26, 0, array( 7, 10, 13, 17)), // 1 array( 25, 44, 7, array( 10, 16, 22, 28)), array( 29, 70, 7, array( 15, 26, 36, 44)), array( 33, 100, 7, array( 20, 36, 52, 64)), array( 37, 134, 7, array( 26, 48, 72, 88)), // 5 array( 41, 172, 7, array( 36, 64, 96, 112)), array( 45, 196, 0, array( 40, 72, 108, 130)), array( 49, 242, 0, array( 48, 88, 132, 156)), array( 53, 292, 0, array( 60, 110, 160, 192)), array( 57, 346, 0, array( 72, 130, 192, 224)), //10 array( 61, 404, 0, array( 80, 150, 224, 264)), array( 65, 466, 0, array( 96, 176, 260, 308)), array( 69, 532, 0, array( 104, 198, 288, 352)), array( 73, 581, 3, array( 120, 216, 320, 384)), array( 77, 655, 3, array( 132, 240, 360, 432)), //15 array( 81, 733, 3, array( 144, 280, 408, 480)), array( 85, 815, 3, array( 168, 308, 448, 532)), array( 89, 901, 3, array( 180, 338, 504, 588)), array( 93, 991, 3, array( 196, 364, 546, 650)), array( 97, 1085, 3, array( 224, 416, 600, 700)), //20 array(101, 1156, 4, array( 224, 442, 644, 750)), array(105, 1258, 4, array( 252, 476, 690, 816)), array(109, 1364, 4, array( 270, 504, 750, 900)), array(113, 1474, 4, array( 300, 560, 810, 960)), array(117, 1588, 4, array( 312, 588, 870, 1050)), //25 array(121, 1706, 4, array( 336, 644, 952, 1110)), array(125, 1828, 4, array( 360, 700, 1020, 1200)), array(129, 1921, 3, array( 390, 728, 1050, 1260)), array(133, 2051, 3, array( 420, 784, 1140, 1350)), array(137, 2185, 3, array( 450, 812, 1200, 1440)), //30 array(141, 2323, 3, array( 480, 868, 1290, 1530)), array(145, 2465, 3, array( 510, 924, 1350, 1620)), array(149, 2611, 3, array( 540, 980, 1440, 1710)), array(153, 2761, 3, array( 570, 1036, 1530, 1800)), array(157, 2876, 0, array( 570, 1064, 1590, 1890)), //35 array(161, 3034, 0, array( 600, 1120, 1680, 1980)), array(165, 3196, 0, array( 630, 1204, 1770, 2100)), array(169, 3362, 0, array( 660, 1260, 1860, 2220)), array(173, 3532, 0, array( 720, 1316, 1950, 2310)), array(177, 3706, 0, array( 750, 1372, 2040, 2430)) //40 ); //---------------------------------------------------------------------- public static function getDataLength($version, $level) { return self::$capacity[$version][QRCAP_WORDS] - self::$capacity[$version][QRCAP_EC][$level]; }//---------------------------------------------------------------------- public static function getECCLength($version, $level) { return self::$capacity[$version][QRCAP_EC][$level]; } //---------------------------------------------------------------------- public static function getWidth($version) { return self::$capacity[$version][QRCAP_WIDTH]; } //---------------------------------------------------------------------- public static function getRemainder($version) { return self::$capacity[$version][QRCAP_REMINDER]; } //---------------------------------------------------------------------- public static function getMinimumVersion($size, $level) { for($i=1; $i= $size) return $i; } return -1; } //###################################################################### public static $lengthTableBits = array( array(10, 12, 14), array( 9, 11, 13), array( 8, 16, 16), array( 8, 10, 12) ); //---------------------------------------------------------------------- public static function lengthIndicator($mode, $version) { if ($mode == QR_MODE_STRUCTURE) return 0; if ($version QRSPEC_VERSION_MAX) return 0; return self::$versionPattern[$version -7]; }// Format information -------------------------------------------------- // See calcFormatInfo in tests/test_qrspec.c (orginal qrencode c lib) public static $formatInfo = array( array(0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976), array(0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0), array(0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed), array(0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b) ); public static function getFormatInfo($mask, $level) { if($mask 7) return 0; if($level 3) return 0; return self::$formatInfo[$level][$mask]; } // Frame --------------------------------------------------------------- // Cache of initial frames. public static $frames = array(); /**-------------------------------------------------------------------- * Put a finder pattern. * @param frame * @param width * @param ox,oy upper-left coordinate of the pattern*/ public static function putFinderPattern(&$frame, $ox, $oy) { $finder = array( "xc1xc1xc1xc1xc1xc1xc1", "xc1xc0xc0xc0xc0xc0xc1", "xc1xc0xc1xc1xc1xc0xc1", "xc1xc0xc1xc1xc1xc0xc1", "xc1xc0xc1xc1xc1xc0xc1", "xc1xc0xc0xc0xc0xc0xc1", "xc1xc1xc1xc1xc1xc1xc1" ); for($y=0; $y</deltalab></fukuchi></deltalab></deltalab></fukuchi>

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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