Zend
200-710 · Question #184
What is the most efficient way to determine if a key is present in an array, assuming the array has no NULL values?
The correct answer is B. isset($a['key']). See the full explanation below for the reasoning.
Arrays
Question
What is the most efficient way to determine if a key is present in an array, assuming the array has no NULL values?
Options
- Ain_array('key', array_keys($a))
- Bisset($a['key'])
- Carray_key_exists('key', $a)
- DNone of the above
How the community answered
(33 responses)- A3% (1)
- B76% (25)
- C6% (2)
- D15% (5)
Topics
#isset#array_key_exists#key lookup#performance
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