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Wordpressframework~10 mins

Caching strategies in Wordpress - Step-by-Step Execution

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Concept Flow - Caching strategies
User requests page
↓
Check cache storage
↓
Cache hit?
No→Generate page dynamically
↓
Store page in cache
↓
Serve cached page
↓
User sees page quickly
This flow shows how WordPress checks for cached content before generating pages, speeding up response by serving stored pages when available.
Execution Sample
Wordpress
<?php
if ( $content = wp_cache_get( 'homepage' ) ) {
  echo $content;
} else {
  $content = generate_homepage();
  wp_cache_set( 'homepage', $content );
  echo $content;
}
?>
This code tries to get the homepage from cache; if missing, it generates, caches, and displays it.
Execution Table
StepActionCache Check ResultPage ContentCache UpdateOutput
1Check cache for 'homepage'MissN/ANoNo output yet
2Generate homepage contentN/A<html>Home</html>NoNo output yet
3Store generated content in cacheN/A<html>Home</html>Cache set with homepage contentNo output yet
4Echo contentN/A<html>Home</html>NoPage displayed to user
5Next request: Check cache for 'homepage'Hit<html>Home</html>NoPage displayed to user from cache
💡 Execution stops after serving cached page or generated page to user.
Variable Tracker
VariableStartAfter Step 2After Step 3After Step 4After Step 5
cache_contentnullnull<html>Home</html><html>Home</html><html>Home</html>
$contentundefined<html>Home</html><html>Home</html><html>Home</html>undefined
Key Moments - 2 Insights
Why does the code check the cache twice with wp_cache_get?
The first check tests if cached content exists (Step 1). The second call retrieves the cached content to output it (Step 5). This avoids generating content unnecessarily.
What happens if the cache is empty or expired?
As shown in Step 1, a cache miss triggers dynamic page generation (Step 2), then the new content is stored in cache (Step 3) for future fast access.
Visual Quiz - 3 Questions
Test your understanding
Look at the execution table, what is the cache check result at Step 1?
AMiss
BExpired
CHit
DNot checked
💡 Hint
See 'Cache Check Result' column at Step 1 in execution_table
At which step is the page content stored in cache?
AStep 2
BStep 3
CStep 4
DStep 5
💡 Hint
Look at 'Cache Update' column in execution_table
If the cache always hits, which steps would be skipped?
ASteps 1 and 5
BStep 4 only
CSteps 2 and 3
DNo steps skipped
💡 Hint
Check what happens on cache hit vs miss in execution_table rows
Concept Snapshot
Caching strategies in WordPress:
- Check cache before generating page
- If cache miss, generate and store page
- Serve cached page on hits
- Speeds up page load by avoiding repeated work
- Use wp_cache_get and wp_cache_set functions
Full Transcript
This visual execution shows how WordPress caching works step-by-step. When a user requests a page, WordPress first checks if the page is in cache. If the cache is empty or expired, WordPress generates the page content dynamically, stores it in cache, then serves it to the user. On subsequent requests, WordPress finds the cached page and serves it immediately, skipping generation. Variables like cache_content and $content track the stored and displayed page content. Key moments include understanding why cache is checked twice and what happens on cache misses. The quiz tests knowledge of cache hits, misses, and which steps run in each case.