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Most referenced — PHP
DateTimeImmutable vs DateTime 4Type Declarations Overview 3Readonly Classes (PHP 8.2) 3Iterators & IteratorAggregate 3allow_url_fopen / allow_url_include 2Migrating from PHP 5.x to PHP 7 and 8 2max_execution_time & set_time_limit() 2PHP SAPI Types (FPM, CLI, Embed) 2
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Namespaces Introduced in PHP 5.3
PHP 5.3+
PHP 5.3 (2009) introduced namespaces with the namespace keyword and backslash separator — enabling PSR-4 autoloading and modern package management with Composer.
3mo ago
php beginner
Out of Memory Errors (memory_limit)
PHP 5.0+
PHP enforces memory_limit in php.ini — exceeding it triggers a fatal E_ERROR that cannot be caught with set_error_handler().
3mo ago
php intermediate
Parse Errors & Syntax Debugging
PHP 5.0+
A ParseError (E_PARSE) means PHP cannot tokenise your file — the script never runs. Common causes: missing semicolons, unclosed brackets, and typos.
3mo ago
php beginner
PDO Introduction — Replacing mysql_* with Prepared Statements
PHP 5.1+
PDO (PHP Data Objects), introduced in PHP 5.1, provided a unified database abstraction layer with named parameters and prepared statements — finally making SQL injection prevention structurally reliable.
3mo ago
php beginner
PHP 5 OOP Revolution — Objects by Reference
PHP 5.0+
1
PHP 5 completely replaced PHP 4's object model — objects became reference-counted handles rather than copies, enabling true OOP with interfaces, abstract classes, visibility, and exceptions.
3mo ago
php intermediate
PHP 7 Performance — 2x Faster Than PHP 5.6
PHP 7.0+
PHP 7.0 (2015) delivered roughly double the throughput of PHP 5.6 through a complete rewrite of Zend Engine internals — without requiring any code changes for most applications.
3mo ago
php intermediate
PHP End-of-Life Schedule & Security Implications
PHP 5.0+
Each PHP minor version receives active support for 2 years and security-only fixes for 1 more year — running an EOL PHP version means no patches for discovered vulnerabilities.
3mo ago
php beginner
Spaceship Operator <=> (PHP 7.0)
PHP 7.0+
The spaceship operator <=> returns -1, 0, or 1 by comparing two values — it replaces verbose if/else comparison callbacks in usort() with a single concise expression.
3mo ago
php beginner
Spread Operator in Arrays [...$a, ...$b]
PHP 8.1+
PHP 8.1+ allows the spread operator ... inside array literals to merge arrays — cleaner than array_merge() for combining arrays inline.
3mo ago
php beginner
Stack Overflow from Deep Recursion
PHP 5.0+
PHP has no configurable stack size limit — deep recursion causes a fatal segfault or memory exhaustion, not a catchable exception.
3mo ago
php intermediate
str_contains / str_starts_with / str_ends_with
PHP 8.0+
PHP 8.0 added str_contains(), str_starts_with(), and str_ends_with() — replace strpos() !== false patterns with these readable alternatives.
3mo ago
php beginner
TypeError — When Type Declarations Throw
PHP 7.0+
TypeError is thrown when a value passed to a typed parameter or return type doesn't match — strict_types=1 makes this happen at call sites too.
3mo ago
php intermediate
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.
3mo ago
php beginner
Undefined Variable and Null Coalescing Fixes
PHP 5.0+
Accessing an undefined variable in PHP returns null and triggers an E_WARNING — use isset(), empty(), or ?? to check safely before use.
3mo ago
php beginner
Assigning new by Reference
PHP 8.1+
Writing $obj = &new ClassName() — assigning a new object by reference is redundant in PHP 5+ where objects are already passed by handle, not value.
3mo ago
php beginner
Asymmetric Visibility (PHP 8.4)
PHP 8.4+
PHP 8.4 allows separate read and write visibility on properties — public(get) private(set) means anyone can read but only the class can write.
3mo ago
php intermediate
Fiber-Based Task Scheduler
PHP 8.1+
Building a cooperative multitasking scheduler with PHP Fibers — suspending and resuming tasks at I/O wait points to run multiple tasks concurrently in a single thread.
3mo ago
php advanced
Generics Workarounds in PHP
PHP 7.0+
PHPDoc @template annotations with PHPStan/Psalm provide compile-time type-safe generics with zero runtime cost — the standard approach for typed collections and repositories.
3mo ago
php advanced
Lazy Objects (PHP 8.4)
PHP 8.4+
PHP 8.4 native lazy object proxies defer initialisation until first access — enabling zero-cost dependency injection of services that may never be used in a request.
3mo ago
php advanced
Legacy Date Functions
PHP 5.0+
Using date(), mktime(), strtotime(), and date_create() instead of DateTimeImmutable — the legacy functions are mutable, timezone-unsafe, and cannot be easily mocked.
3mo ago
php intermediate