The PHP Language Hub for South Florida Working Developers

The PHP.net manual is the only authoritative source for runtime behaviour, and it states its contract up front: every code example declares the exact minor version it targets. You check php.net/supported-versions before you commit to a syntax feature, not after a staging deploy fails on a host still running PHP 8.1 when your code requires 8.2. South Florida shared cPanel defaults lag behind current releases, so the version boundary is a live constraint, not a footnote.

Route yourself by intent. You are here to understand modern PHP's break from the past, use the type system, structure classes, handle errors, or apply versioned features like enums and attributes. Pick your section and leave with a working example.

• Authoritative reference: PHP.net manual, versioned per minor release
• South Florida default lag: Shared cPanel hosts often default to the previous minor version
• Reproducible builds: Composer lock file, not the vendor directory, is the contract
• Live error level: E_ALL & ~E_DEPRECATED & ~E_STRICT
• Debugger boundary: Xdebug must be disabled on live servers; opcache must be enabled

The minor version number is not a marketing label. It is the set of syntax features and type-system improvements available with no polyfills. PHP 8.0 introduced named arguments, attributes, constructor property promotion, and the match expression. PHP 8.1 added enums, readonly properties, and fibers. PHP 8.2 added readonly classes and disjunctive normal form types. Each release also tightens error handling: notices that were silent become warnings, and warnings become exceptions.

South Florida live environments compound this. A cPanel host that advertises PHP 8.x availability may have MultiPHP set to 7.4 by default. After a panel update, the selector can silently revert. The practical ceiling for many small-business projects is whichever release the host's support team will not break during the next maintenance window. Check the version with phpversion() or php -v at the SAPI boundary, not from a phpinfo() page you assume is current.

PHP 8.x features are not a buffet. They are a version lock. Pick one from the new minor release, and your entire dependency graph must support that release. The PHP-FIG standards process and Packagist constraint strings make this explicit: a package requiring ^8.1 will not install on 8.0, and a project stuck on 8.0 cannot use enums or readonly properties.

Match Expression Versus Switch

The match expression (PHP 8.0) returns a value and performs strict comparison. A switch statement does loose comparison and requires break to avoid fall-through. Failure mode: a switch on a numeric string '0' matches case 0 silently. A match expression on the same value throws an UnhandledMatchError because '0' does not equal 0 with strict comparison. Use match when you need exhaustive arm checking and a return value. Skip it only when your host is below 8.0.

Enums Are a Type, Not an Array of Constants

Enums (PHP 8.1) are first-class types. A backed enum with string values serialises to the value, but a pure enum serialises to the case name. Failure mode: storing a pure enum case in a database and reading it back without a from() or tryFrom() method loses type safety and produces a string that will not match the original case in a strict comparison. Define enums when a value has a fixed set of legal options. Avoid them when the set of options is open-ended or user-supplied.

Readonly Properties and Constructor Promotion

Readonly properties (PHP 8.1) can be set once, and only from the constructor. Combined with constructor property promotion (PHP 8.0), a value object becomes a single-line class declaration. Failure mode: a readonly property set in the constructor cannot be modified later, even inside the class. If a method needs to mutate state, use a regular property or a clone-with-modification pattern. Readonly classes (PHP 8.2) extend this to every property, which is ideal for DTOs but a mistake for entities that change over time.

Attributes Replace Docblock Annotations

Attributes (PHP 8.0) are native metadata read at runtime via reflection. They replace the docblock annotations that required a separate parser library. Failure mode: an attribute class not imported with use will not be resolved and the annotation is silently ignored. Always declare attribute classes with #[Attribute] and import them. Use attributes for routing, validation rules, and event listeners where the framework supports them. Do not invent custom attributes for logic that belongs in plain PHP code.

Type declarations and strict types are separate mechanisms. A type declaration on a function parameter tells the engine what to expect. Strict types, enabled with declare(strict_types=1) at the top of a file, tell the engine to reject type coercion. Without strict types, PHP coerces an integer 7 into a float parameter without complaint. With strict types, that call throws a TypeError. The difference is whether you catch the mismatch at development time or in live data corruption.

Union types (PHP 8.0) allow a parameter to accept multiple types. Nullable types, written as ?Type or Type|null, are a subset of union types that explicitly permit null. The failure mode on union types is forgetting that the return type must cover every branch. A function that returns string in one condition and null in another must declare string|null. Without it, the null return is a TypeError in strict mode.

The PSR-12 coding style mandates a declare(strict_types=1) line in every PHP file. South Florida code review norms increasingly enforce this as the baseline. But PSR-12 does not guarantee the host configuration respects it. Strict types apply per file; a file without the declare statement uses coercive mode even if every other file in the project uses strict mode. Check every file that touches external input.

The error-handling hierarchy in modern PHP is unified under the Throwable interface. Errors and Exceptions both implement Throwable. The error_reporting bitmask controls which error levels are reported, and display_errors controls whether they are shown to the user. The correct live value for the error_reporting bitmask is E_ALL & ~E_DEPRECATED & ~E_STRICT. Any other setting is a misconfiguration that either hides fatal errors or floods logs with noise.

South Florida staging environments frequently leak stack traces because display_errors is overridden at the application level. The framework's debug mode, controlled by an environment variable, toggles display_errors independently of the php.ini setting. When the environment variable is not set correctly per environment, a live server can display full stack traces to end users. Verify this at the SAPI boundary: check both ini_get('display_errors') and the framework's own debug flag before you consider a deployment complete.

The real division between a bootcamp graduate and a senior developer is whether they catch Throwable or Exception. Catching Exception misses TypeErrors and ParseErrors. Catching Throwable catches everything, but it also catches errors you cannot recover from. The rule: catch specific exception types in application code, and reserve a top-level Throwable handler for logging and a user-friendly fallback response.

Every modern South Florida PHP project assumes PSR-4 autoloading. The standard maps a namespace prefix to a directory structure. Composer generates the autoloader from this mapping, and the autoloader is the file that resolves class references at runtime. A class in the App\Services namespace lives in the src/Services/ directory. Move the file without updating the namespace, and the autoloader cannot find it.

PSR-12 coding style extends PSR-2 with rules for strict types, nullable types, and short closures. Automated fixers like PHP CS Fixer and PHP_CodeSniffer enforce it. In South Florida code review, a pull request that fails the PSR-12 check is rejected before the logic is even discussed. Configure your IDE to apply PSR-12 on save, and add a pre-comit hook that runs the fixer. The one thing you cannot automate is the decision of what a class should expose: narrow interfaces with a single responsibility beat a single class that mixes data access, business logic, and HTTP concerns.

Interfaces define a contract. Classes implement it. The PHP-FIG publishes PSR standards that are themselves interfaces: PSR-7 defines HTTP message interfaces, and PSR-15 defines the middleware handler that processes them. A South Florida Slim application, common in API-only shops, relies on PSR-7 and PSR-15 implementations. Swapping the implementation means the application code does not change. Testing against an interface with a mock is cheaper than testing against a concrete class that hits a database.

Feature	PHP Version	What Breaks	Fix
Named arguments	8.0	Parameter name changes in a subclass break caller code	Refactor parameter names in the interface first
Match expression	8.0	Strict comparison throws UnhandledMatchError on type mismatch	Exhaust arms and use identical types on both sides
Enums	8.1	Pure enum serialised as case name does not deserialise back to enum	Use backed enums with from() or tryFrom() for persistence
Readonly properties	8.1	Cannot modify after construction, even inside the class	Clone with property override for state changes
Fibers	8.1	Fibers are not supported by most debuggers and profilers	Use a promise abstraction until tooling catches up

Composer install and Composer update are different commands with different failure modes. Composer install reads the lock file and installs exactly the versions recorded there. This is a reproducible build. Composer update recalculates the dependency graph, rewrites the lock file, and pulls whatever new versions satisfy the constraints. Running update on a live server or as part of a routine deploy is a dependency hell trigger: the lock file changes, untested packages ship, and a minor library update breaks a live endpoint.

The lock file is the commit-to-version-control rule. Delete it and run update as a deliberate act when you are upgrading packages, not as a routine step when you are deploying. The memory exhaustion failure mode occurs when running update on a large dependency graph without raising the PHP memory limit. The process dies with an out-of-memory error after resolving a fraction of the packages. Raise the memory limit for the update command, then restore it for normal operation.

Packagist download counts and abandon flags are the closest thing to a market-share signal for PHP packages. A package with zero merged community pull requests in 12 months is effectively abandoned regardless of its Packagist badge. Before you depend on a package, check the date of the last non-maintainer merge, not the last commit by the sole maintainer who fixes a typo.

South Florida shared hosting is dominated by cPanel. Its PHP version selector and MultiPHP INI editor define the ceiling for many small-business projects. Developing on MySQL 8 with strict mode on and deploying to a shared host with MySQL 5.7 strict mode off is the most common source of silent data corruption. Strict mode data truncation: overlong strings are silently truncated, invalid dates become 0000-00-00, and no error is logged. The fix is to develop against the same MySQL release and strict mode setting as the live server, or to validate data length and format in application code before it reaches the database layer.

PDO and the ORM Abstraction Leak

PDO is the built-in PHP data-access layer. ORMs and query builders are convenience layers on top, and when they fail, the fix is in PDO configuration or raw SQL. The database abstraction claim of an ORM is real only when the abstraction is complete. An ORM that generates different SQL for MySQL 5.7 and MySQL 8 is an abstraction. One that assumes MySQL 8 window functions on a 5.7 host is a leak that fails at runtime.

Cloud Defaults and the Twelve-Factor Trap

DigitalOcean's LAMP one-click image sets a de facto default environment for South Florida Laravel and Symfony deployment tutorials. The AWS Miami Local Zone reduces latency to South Florida end users and is relevant for PHP applications serving local traffic with compliance boundaries. But neither cloud provider sets your error reporting. The twelve-factor application principles as applied to PHP mean config in environment variables, stateless processes, and logs as event streams. A .env file on a live server is a failure mode: the file is parsed on every request if the framework does not cache the config, and a deployment that loses the file loses the application's configuration.