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    PHP Mastery Tutorial 0/120 lessons ~6 min read Lesson 85

    CI/CD

    CI/CD is a single PHP idea you'll use in almost every backend project. In this lesson you learn only ci/cd — not five topics at once. By the end you can write a small working ex…

    Course progress0%
    Focus
    12 guided sections
    Practice signal
    Examples included
    Career prep
    Interview Q&A included

    Quick Introduction

    CI/CD is a single PHP idea you'll use in almost every backend project.

    In this lesson you learn only ci/cd — not five topics at once. By the end you can write a small working example and explain it in an interview.

    We connect each lesson to our course projects: Login System, Blog CMS, REST API, Inventory, Employee Management, and E-Commerce Backend.

    Business Problem

    You're building the REST API. After a user signs in, you need ci/cd working correctly before storing data or showing a dashboard.

    Without understanding CI/CD, the team ships bugs: wrong totals, broken sessions, or type errors that only appear in production. This lesson fixes that with one clear pattern you can copy into your project today.

    Core Concept

    • CI/CD is one focused idea — learn it before mixing with other PHP topics.
    • Use it in PHP 8.3+ with declare(strict_types=1); at the top of every file.
    • Our course project (REST API) uses ci/cd in real handlers.
    • Run small scripts with php file.php after each change — don't just read.
    • Interviewers ask for a one-minute explanation plus a tiny code sample.

    Syntax

    Core syntax for CI/CD. Every keyword below appears in production PHP — Laravel and Symfony use the same primitives under the hood.

    php
    declare(strict_types=1);

    Keywords: declare · strict_types · namespace

    Step-by-Step Example

    Run this script locally. Change one value, run again, and watch what changes.

    php
    <?php
    declare(strict_types=1);
    

    // GitHub Actions step runs: composer test && vendor/bin/phpstan analyse
    $branch = getenv('GITHUB_REF_NAME') ?: 'local';
    $sha    = getenv('GITHUB_SHA') ?: 'dev';
    

    $steps = [
        'composer validate --strict',
        'vendor/bin/phpunit --colors=always',
        'vendor/bin/phpstan analyse src --level=8',
    ];
    

    foreach ($steps as $step) {
        echo "[CI {$branch}@{$sha}] {$step}\n";
    }
    

    if (version_compare(PHP_VERSION, '8.3.0', '<')) {
        fwrite(STDERR, "CI requires PHP 8.3+\n");
        exit(1);
    }
    echo "Pipeline OK\n";

    Line by line

    1. — part of the ci/cd example; run the file to see the result.
    2. declare(strict_types=1); — turns on strict type checking for this file.
    3. $branch = getenv('GITHUB_REF_NAME') ?: 'local'; — part of the ci/cd example; run the file to see the result.
    4. $sha = getenv('GITHUB_SHA') ?: 'dev'; — part of the ci/cd example; run the file to see the result.
    5. $steps = [ — part of the ci/cd example; run the file to see the result.
    Authenticated

    Real-World Example

    In the REST API, ci/cd appears in a single request handler — not spread across ten files. Keep the example small, test it with php, then paste the pattern into your project branch.

    That is how Laracasts-style learning works: one concept, one file, one win per lesson.

    Best Practices

    • One concept per file while learning ci/cd.
    • Start from the course code sample, change one line, re-run.
    • Name variables and functions clearly — $loginCount beats $x.
    • Use PHP 8.3 on your machine; match the version in production later.
    • Write a one-sentence comment at the top: what this script proves about ci/cd.

    Common Mistakes

    • Trying to learn ci/cd together with three other topics in one sitting — split them like this course does.
    • Skipping declare(strict_types=1); and getting silent type coercion bugs.
    • Copying code without running it — always execute with php your-file.php.
    • Using outdated PHP 5 tutorials (mysql_*, short tags) instead of PHP 8.3 docs.
    • Not connecting ci/cd to the course project — practice inside Login, Blog, or Inventory code.

    Hands-on Exercise

    Task: Create a file ci_cd.php that demonstrates ci/cd for the REST API.

    Challenge: Add one edge case (empty input, zero, or invalid type) and print a friendly error message.

    php
    <?php
    declare(strict_types=1);
    

    // TODO: CI/CD exercise for REST API

    Summary

    • CI/CD is one concept — master it before combining with the next lesson.
    • Always use strict_types while learning PHP 8.3+.
    • Practice inside the REST API codebase as you progress.
    • Run code with php after every edit.
    • You can explain this topic in under two minutes with the sample script.
    • Next lesson builds on this — don't skip the exercise.

    Key Takeaways

    • You know what CI/CD is and when to use it.
    • You can read and write the syntax from this lesson.
    • You ran the example and changed it successfully.
    • You can spot the five common mistakes listed above.
    • You answered at least three interview questions out loud.

    Interview Questions

    Q1BeginnerWhat is CI/CD in PHP?
    CI/CD lets you talk to the database in PHP. In our REST API, it appears in small, testable scripts before we move code into classes.
    Q2BeginnerWhy use CI/CD instead of a shortcut?
    Shortcuts hide bugs. CI/CD makes behavior explicit so teammates and PHPStan can understand your code.
    Q3BeginnerShow a minimal CI/CD example.
    Open this lesson's sample file, run it with php, and explain each line in plain English — that is enough for a junior interview.
    Q4BeginnerCommon beginner mistake with ci/cd?
    Mixing multiple new concepts in one file. Learn CI/CD alone first, then combine in the course project.
    Q5BeginnerHow do you test ci/cd locally?
    Save a .php file, run php file.php, and compare output to what you expected. Add one PHPUnit test when you move code into a class.
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