How can you safely update a post meta value only if it already exists, without adding a new meta key if missing?

hard📝 Application Q9 of 15

Wordpress - Custom Fields and Meta Data

AUse add_post_meta() with unique flag set to true

BCall update_post_meta() directly; it never adds new keys

CDelete the meta key first, then add it again

DCheck existence with get_post_meta() before calling update_post_meta()

Step-by-Step Solution

Solution:

Step 1: Understand update_post_meta() behavior
It adds the meta key if it does not exist.
Step 2: Prevent adding new key
Check if meta exists with get_post_meta() before updating.
Final Answer:
Check existence with get_post_meta() before calling update_post_meta() -> Option D
Quick Check:
Prevent new keys by checking existence first [OK]

Quick Trick: Use get_post_meta to check before update_post_meta [OK]

Common Mistakes:

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