A practical guide to PHP's implode() function for joining array values into strings. Covers the function signature, common use cases (comma-separated lists, CSS class strings, SQL fragments), practical code examples, and important gotchas including null handling, nested arrays producing warnings, non-string scalar casting, and the deprecated reversed parameter order in PHP 8+. Also clarifies the difference between implode() and its counterpart explode().
Table of contents
IntroductionHow to use implode() in PHPWhen implode() is the right toolPractical examples of implode()Common pitfalls and gotchasimplode() vs explode()Conclusion3 Impressions