PHP - Arrays
Given the array
$items = ['pen' => 3, 'pencil' => 5, 'eraser' => 3];, which code snippet finds all keys with the value 3?Given the array $items = ['pen' => 3, 'pencil' => 5, 'eraser' => 3];, which code snippet finds all keys with the value 3?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify function to find all keys by value
array_keys() with second parameter returns all keys matching that value.Step 2: Compare options
array_search() returns first key only, in_array() returns boolean, array_key_exists() checks keys.Final Answer:
$keys = array_keys($items, 3); -> Option BQuick Check:
Find all keys by value = array_keys() with value param [OK]
Quick Trick: Use array_keys(array, value) to get all matching keys [OK]
Common Mistakes:
- Using array_search() for all keys
- Using in_array() expecting keys
- Confusing array_key_exists() with value search
Master "Arrays" in PHP
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