PHP - Array Functions
Which of the following is the correct syntax to use
array_filter with a callback function named isPositive on array $numbers?Which of the following is the correct syntax to use array_filter with a callback function named isPositive on array $numbers?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall array_filter syntax
The second argument must be a callable, passed as a string or anonymous function.Step 2: Identify correct callable format
Passing the function name as a string, like 'isPositive', is correct.Final Answer:
array_filter($numbers, 'isPositive'); -> Option DQuick Check:
Callback function name as string [OK]
Quick Trick: Callback function names go in quotes [OK]
Common Mistakes:
- Passing callback without quotes
- Swapping argument order
- Using & before function name
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