Intermediate terms
Eager Loading
PHP 5.0+
Loading related data upfront in a single query rather than deferring until access, preventing N+1 query problems.
3mo ago
performance intermediate
Eager vs Lazy Loading — When to Use Each
PHP 5.0+
Eager loading fetches related data upfront in one query; lazy loading defers it until accessed — the wrong default causes N+1 or over-fetching.
3mo ago
performance intermediate
Email Deliverability
PHP 5.0+ The technical requirements for email reaching inboxes rather than spam folders — SPF, DKIM, DMARC, and sending reputation work together to authenticate your emails.
3mo ago
networking intermediate
Email Header Injection
PHP 5.0+
Injecting extra headers or recipients into mail() calls via unvalidated user input, enabling spam relay and phishing.
CWE-93 OWASP A3:2021
3mo ago
security intermediate
6.5
Embeddings
Dense numerical vector representations of text, images, or other data — capturing semantic meaning so that similar items have similar vectors and can be found via distance search.
3mo ago
ai_ml intermediate
End-to-End Testing
1
Testing complete user flows through a real browser against a running application — verifying that all layers work together from UI to database.
3mo ago
testing intermediate
Entropy
PHP 7.0+
2
A measure of unpredictability in a value — high entropy means many possible values, making brute-force infeasible.
3mo ago
general intermediate
Enum Methods, Interfaces & Constants (PHP 8.1)
PHP 8.1+
PHP 8.1 enums support methods, interface implementation, constants, and static factory methods — making them full-featured types, not just value lists.
3mo ago
php intermediate
Enums (PHP 8.1)
PHP 8.1+
3
Native enumerations providing type-safe named constants that replace class-constant patterns and stringly-typed values.
3mo ago
php intermediate
escapeshellarg()
PHP 5.0+
1
Wraps a string in single quotes and escapes internal quotes for safe use as a single shell argument.
3mo ago
php intermediate
Eval Injection
PHP 5.0+
3
User input passed to eval() executes as PHP code, giving attackers full server-side code execution.
CWE-95 OWASP A3:2021
3mo ago
security intermediate
9.8
Event Delegation
ES5 A pattern that attaches a single event listener to a parent element instead of many listeners to children — using event bubbling to handle events from dynamically added children.
3mo ago
javascript intermediate
Event-Driven Architecture
PHP 5.0+
2
A design paradigm where components communicate by producing and consuming events, enabling loose coupling and asynchronous processing.
3mo ago
architecture intermediate
Eventual Consistency
PHP 5.0+ A consistency model where replicas may diverge temporarily but converge to the same value given no new writes — trading immediacy for availability.
3mo ago
architecture intermediate
Exception Hierarchy & Custom Exceptions
PHP 5.0+
Defining domain-specific exception classes that extend SPL exceptions provides semantic meaning and enables granular catch blocks.
3mo ago
php intermediate
Excessive File I/O
PHP 5.0+
Reading the same file multiple times inside a loop or across repeated calls — avoidable with simple in-memory caching.
3mo ago
performance intermediate
EXPLAIN & Query Plans
PHP 5.0+
EXPLAIN (ANALYZE) reveals how the database executes a query — sequential scans, index scans, join strategies — to guide optimisation.
3mo ago
database intermediate
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.
3mo ago
php intermediate