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How to Generate Verifiable PDF Certificates in Laravel

When a learner finishes a course they want a certificate that behaves like a document: something they can print at full quality, attach to a job application and that an employer can check is genuine. In this tutorial you'll build exactly that in Laravel: a Blade-designed certificate rendered as a vector PDF, with a QR code that resolves to a verification page and an email that delivers it automatically. This post originally appeared on Accreditly as How to generate verifiable PDF certificates in Laravel . Keep the design in Blade The certificate is an ordinary Blade view. Everything lives in one file, styles inline, so the markup you preview in the browser is exactly what gets rendered. If you want a designed starting point rather than a blank page, the certificate of completion template is a good base to adapt. {{-- resources/views/certificates/template.blade.php --}} <!doctype html> <html> <head> <meta charset="utf-8"> <style> body { font-family: Georgia, serif; color: #1a2233; margin: 0; } .certificate { padding: 60px; border: 6px double #b28a2f; margin: 24px; text-align: center; } .heading { font-size: 15px; letter-spacing: 4px; text-transform: uppercase; color: #b28a2f; } h1 { font-size: 44px; margin: 24px 0 8px; } .course { font-size: 22px; margin: 4px 0 28px; } .issued { font-size: 15px; color: #5a6478; } .qr { margin-top: 36px; } .verify-url { font-size: 12px; color: #5a6478; } </style> </head> <body> <div class="certificate"> <p class="heading">Certificate of Completion</p> <h1>{{ $certificate->user->name }}</h1> <p class="course">has completed {{ $certificate->course }}</p> <p class="issued">Issued {{ $certificate->issued_at->format('j F Y') }}</p> <div class="qr"> {!! QrCode::size(110)->generate(route('certificates.verify', $certificate)) !!} </div> <p class="verify-url">{{ route('certificates.verify', $certificate) }}</p> </div> </body> </html> Two things are doing quiet work here. The design flows like a document rather than being pinned to fixed pixel

2026-07-22 原文 →
AI 资讯

Nobody Ever Calculated the ROI of Email

Everyone is arguing about AI ROI right now. Boards want a number. Consultants are selling frameworks. And the headlines look brutal: an MIT report claimed 95% of enterprise GenAI pilots showed no measurable return, and a Forbes piece this January says 56% of CEOs see zero ROI from AI. So AI is a bust, right? Here is the thing. Ask any of those same companies to turn off email for a week. Just try it. Nobody ever ran a six month ROI study on email. Nobody had to. It became the way work happens, and the return stopped being a line item because it was everywhere. I think AI is following the same path, and the data backs it up. The gap between the pilot and the person That same MIT report has a stat that got way less coverage than the 95% number: 90% of employees regularly use personal AI tools for work, while only 40% of companies have an official LLM subscription. Workers adopted it at more than twice the rate of their own employers. The report even found that 70% of workers prefer AI over a colleague for quick stuff like drafting emails and basic analysis. So the official pilot fails its KPI review while the people inside the building are quietly using AI multiple times a day. That is not a failed technology. That is a measurement problem. Worth noting: the 95% figure itself has been heavily criticized. It came from 52 interviews and a narrow definition of success. I would not build a strategy on that number in either direction. Why the ROI is invisible The value seems to be landing in the same place email's value landed: the unglamorous middle of the workday. Drafting the reply. Summarizing the thread. Turning messy notes into something you can send. None of that shows up as a new revenue line. It shows up as an hour you got back and immediately spent on something else. You cannot easily measure that, but you can feel it. Take the tools away from a developer who has been using them for a year and watch what happens. People cannot imagine working without it anymore.

2026-07-22 原文 →
AI 资讯

When Every Zstandard Library Failed on Android, I Built My Own

Meet unzstd - a pure Java Zstandard (zstd) decoder for Android and the JVM. What looked like a simple dependency turned into a surprisingly difficult problem. I needed to decompress zstd-compressed datasets in an Android app. Existing options all had major trade-offs: aircompressor 2.x depends on "sun.misc.Unsafe", which crashes on Android ART. aircompressor 3.x moved to "java.lang.foreign", which Android doesn't support. zstd-jni works well, but requires native ".so" files, ABI-specific packaging, and brings additional complexity with newer Android memory page requirements. I had to build a pure Java alternative so I ported aircompressor's decoder The result: ✅ No native code ✅ No "Unsafe" ✅ No "java.lang.foreign" ✅ Android API 26+ ✅ JVM 9+ ✅ Zero "Unsafe" references in the compiled bytecode (verified) To make sure it was actually correct, I differentially tested it against libzstd across compression levels 1-22, covering one-shot decompression, streaming, fuzzing, and corruption-boundary tests. It's decode-only, Apache 2.0 licensed, and completely open source. If you're building Android or Java applications that consume zstd-compressed data, I hope this saves you a few days of debugging. implementation("com.qyntrax:unzstd:0.1.0") GitHub: https://github.com/mbobiosio/unzstd Feedback, bug reports, and contributions are always welcome. Android #Java #Kotlin #OpenSource #JVM #Zstd #Compression

2026-07-22 原文 →
AI 资讯

Show HN: Edky, a CLI to convert Ed25519 public keys from one encoding to another

Everything increasingly runs on Ed25519 keypairs, but Ed25519 public keys can be encoded as text in dozens of surface-incompatible different ways: hexadecimal, Base64 (OpenSSH), Base32z (iroh, pkdns), Base58 (NEAR), and Multibase (IPFS, libp2p), just for starters. Edky is a command-line tool and Rust library that converts between these Ed25519 surface encodings, aiding use of the same underlying keypair across e.g. an iroh endpoint, a libp2p peer, or a NEAR Protocol account. (Surprisingly, a con

2026-07-22 原文 →
AI 资讯

Why Every Developer Needs a Personal Website

Your resume tells people what you’ve done. Your GitHub shows what you’ve built. But your personal website tells people who you are. When I started learning web development, I believed that a good resume and a few GitHub repositories were enough. Like many students, I spent countless hours building projects, solving coding problems, and learning new technologies. Every new project felt like a milestone, yet all of them remained scattered across different platforms. A recruiter would have to open my resume, visit my GitHub, search for my LinkedIn profile, and perhaps never even discover the articles I had written or the experiments I had built. That made me realise something important. Developers need a place on the internet that they truly own. Not another profile. Not another social media account. A place that represents their identity, work, and journey. That’s what a personal website becomes. More Than Just a Portfolio Many people hear the words personal website and immediately think of a portfolio with a few screenshots and a contact form. A great developer website goes much further. It answers questions before anyone has to ask them. Who are you? What technologies do you enjoy working with? What problems have you solved? What kind of developer are you becoming? What have you learned recently? How can someone reach you? Instead of forcing visitors to jump across five different platforms, everything exists in one carefully designed experience. Your Name Deserves a Home Every developer works hard to build projects. Very few work equally hard to build their own identity. When someone searches your name, what should they find? Ideally, the very first result should be something you completely control. A website with your own domain isn’t just another webpage. It’s your digital home. Unlike social platforms, algorithms cannot redesign your identity overnight. You decide what visitors see first. You decide which projects matter. You decide how your story is told. Resume

2026-07-22 原文 →
AI 资讯

Technologies And Concepts: Cheat Sheet for Developer Associate (DVA-C02)

Exam Guide: Developer - Associate Technologies And Concepts Cheat Sheet 📘 Cheat Sheet 1 | Services Compute Service What It Does Key Points Lambda Serverless Functions 15 min timeout, 10240 MB memory max, 1000 default concurrency EC2 Virtual Servers Instance profiles for IAM roles, user data for bootstrap ECS/Fargate Container Orchestration Task roles for IAM, Fargate = serverless containers Elastic Beanstalk PaaS Deployment .ebextensions for config, supports rolling/immutable/blue-green Storage & Databases Service What It Does Key Points DynamoDB NoSQL key-value Partition keys, GSI/LSI, query vs scan, DAX for caching S3 Object Storage SSE-S3/SSE-KMS/SSE-C, lifecycle policies, presigned URLs ElastiCache In-memory Cache Redis (complex types, persistence) vs Memcached (simple, multi-threaded) RDS Relational Database RDS Proxy for Lambda connection pooling, read replicas OpenSearch Search & Analytics Full-text search, log analytics API & Integration Service What It Does Key Points API Gateway REST/HTTP/WebSocket APIs Stages, authorizers, caching, request validation, throttling SQS Message Queue Standard (at-least-once) vs FIFO (exactly-once), visibility timeout, DLQ SNS Pub/sub messaging Fanout, filter policies, message attributes EventBridge Event Bus Pattern matching, content-based filtering, multiple targets Kinesis Real-time Streaming Shards, partition keys, parallelization factor Step Functions Workflow Orchestration Standard (long-running) vs Express (high-volume, short) Security Service What It Does Key Points IAM Access Management Policies, roles, least privilege, STS AssumeRole Cognito User Auth User Pools (tokens) vs Identity Pools (AWS credentials) KMS Key Management Envelope encryption, 4 KB limit, key rotation, cross-account Secrets Manager Secret Storage Auto-rotation, $0.40/secret/month SSM Parameter Store Config Storage Standard (free) vs Advanced , SecureString type ACM SSL/TLS Certificates Free public certs, auto-renewal, can't export CI/CD Service Wha

2026-07-22 原文 →
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