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A curated knowledge graph with editorial governance
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Terms are connected by reviewed, typed relationships, making it possible to follow how ideas relate across the entire corpus. Every connection is sourced, reviewed, and tracked, while the system continuously checks for missing links, dead references, and gaps in coverage.
The result is less a glossary and more a curated knowledge graph — designed not just to define concepts, but to show how they connect.
Glossary
A developer glossary, written to teach — built to be cited.
1.5k terms across 33 categories — definitions, examples, common mistakes and fixes. Authored under one editorial standard. Cross-linked, searchable, and openly crawled by AI agents.
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- Prompt Injection Attack Often seen in AI Agents & Tool Use 2h
- Key Array Functions (array_map, array_filter, array_reduce…) Contains compact() & extract() — Variable Packing 2h
- Python async/await & asyncio Leverages Python Generators & yield 2h
- Python async/await & asyncio Leverages Context Managers & with Statement 2h
- SOLID Principles (Overview) Contains Dependency Inversion Principle (DIP) 2h
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Last 30 days
Agents 605
Ahrefs 202
Google 130
Scrapy 101
Common Crawl 46
ChatGPT 41
Bing 24
Sogou 23
SEMrush 20
Twitter/X 9
Perplexity 8
Qwen 1
Scrapy 583
Ahrefs 170
Google 89
SEMrush 84
Perplexity 56
Claude 49
ChatGPT 31
Bing 20
Sogou 17
Qwen 7
Amazonbot 4
Amazonbot 12.8k
Scrapy 11.7k
ChatGPT 10.2k
Perplexity 9.4k
Google 5.9k
Ahrefs 5.1k
SEMrush 3.4k
Unknown AI 2.9k
Claude 2k
Meta AI 1.6k
Bing 1.4k
Majestic 727
Sogou 166
Qwen 147
You.com 98
Common Crawl 46
DuckDuckGo 18
Twitter/X 10
NotebookLM 6
LinkedIn 2
Backlinks.com 1
PetalBot 1
Most referenced terms
PWA Installation & Add to Homescreen 10
AI Model Selection Criteria 5
Server-Side Request Forgery (SSRF) 4
JWT Vulnerabilities 4
Insecure Cookie 4
Dijkstra's Shortest Path Algorithm 4
Cloud Backup & Disaster Recovery 4
Long Polling vs SSE vs WebSockets 3
Most active categories
How they use it
crawler 62k
crawler_json 4.8k
rag 1
pre-tracking
739
First ping
23 Mar 2026
Last 7 days
12.8k pings
Distinct agents
21
Unidentified
2.9k
Discriminated Unions
2.0
2
A union of types that each carry a shared literal field (the discriminant) allowing TypeScript to narrow exhaustively — the canonical way to model mutually exclusive states.
👁 363
typescript intermediate
PWA Installation & Add to Homescreen
HTML5
1
Progressive Web Apps can be installed to the home screen like native apps — requiring HTTPS, a Web App Manifest, and a Service Worker, plus meeting browser-specific installation criteria.
👁 333
mobile intermediate
Smoke Testing
A minimal set of tests run immediately after deployment to verify the application is alive and its critical paths are functional before deeper testing or traffic.
👁 326
testing beginner
Undefined Array Key / Offset Errors
PHP 4.0+
Accessing a non-existent array key triggers E_WARNING (PHP 7) or is silently null (PHP 8 with nullsafe) — use isset(), array_key_exists(), or ?? to guard access.
👁 273
php beginner
Array Destructuring ([] = …)
PHP 7.1+
1
PHP's short list() syntax — [$a, $b] = $arr — assigns array elements to variables in a single expressive statement.
👁 238
php intermediate
Division by Zero & DivisionByZeroError
PHP 7.0+
PHP 7+ throws DivisionByZeroError for intdiv() and modulo with zero — but the / operator returns false or INF instead of throwing.
👁 238
php beginner
Type Coercion
PHP 7.0+
PHP's automatic conversion between types can produce unexpected comparison results, leading to logic bugs and security bypasses.
CWE-704 OWASP A3:2021
👁 228
php intermediate
8.1
Exception Handling (try/catch/finally)
PHP 5.0+
3
PHP's structured error handling mechanism that separates error-path code from the happy path and ensures resource cleanup.
👁 213
php intermediate
password_hash() — Native Bcrypt (PHP 5.5)
PHP 5.5+
PHP 5.5 added password_hash() and password_verify() — the only correct way to hash and verify passwords. Never use MD5, SHA1, or unsalted hashes.
👁 204
php beginner
CSRF Token Handling in Fetch & Axios
ES2017
Including PHP-generated CSRF tokens in JavaScript requests — reading from meta tags or cookies and attaching to every state-changing request.
👁 203
javascript intermediate
Type Juggling
PHP 5.0+
1
PHP's loose comparison (==) can produce unexpected results — "0e123" == "0e456" is true, enabling auth bypasses.
CWE-704 OWASP A3:2021
👁 203
security intermediate
8.1
RoadRunner — Persistent PHP Worker
PHP 8.0+
Go-based server keeping PHP workers alive between requests — eliminating per-request bootstrap cost.
👁 195
performance advanced
PHAR Deserialization Attack
PHP 5.0+
PHP's phar:// stream wrapper triggers deserialization of PHAR metadata on any file operation, enabling PHP object injection without unserialize().
CWE-502 OWASP A8:2021
👁 189
security advanced
9.8
preg_replace /e Modifier (Removed)
PHP 3.0+
The /e modifier in preg_replace() evaluated the replacement as PHP code — removed in PHP 7.0. Any legacy code using it is a critical RCE vulnerability.
👁 173
security advanced
Test-Driven Development (TDD)
PHP 7.0+
1
A development practice where tests are written before the code they test — Red (write a failing test), Green (write the minimum code to pass), Refactor (improve without breaking tests).
👁 173
testing intermediate
OpenTelemetry
2
OpenTelemetry (OTel) is the open standard for telemetry — a vendor-neutral SDK for traces, metrics, and logs that exports to any backend (Jaeger, Datadog, Honeycomb, Prometheus).
👁 166
observability intermediate
ORM — Object-Relational Mapper
PHP 7.0+
1
A library that maps database rows to PHP objects and vice versa — handling SQL generation, relationships, and lazy loading, at the cost of hiding query behaviour that can cause N+1 problems if used carelessly.
👁 166
database beginner
.env Files & Environment Variables
PHP 5.6+
4
Storing configuration in environment variables (not source code), loaded from a .env file in development via libraries like vlucas/phpdotenv.
OWASP A2:2021
👁 163
php beginner
CRLF Injection
PHP 5.0+
Injecting carriage-return and line-feed characters into HTTP headers splits responses or injects new headers, enabling log poisoning and XSS.
CWE-93 OWASP A3:2021
👁 161
security intermediate
6.1
Dijkstra's Shortest Path Algorithm
PHP 5.3+
1
A greedy graph algorithm that finds the shortest path from a source node to all other nodes in a weighted graph with non-negative edge weights.
👁 158
algorithms advanced