`isset()` vs. `array_key_exists()` in PHP: Which is Faster and More Precise for Array Key Checks?

Which PHP Approach is Swifter and More Discerning for Array Key Verification?

In PHP, determining whether a key exists in an array can be accomplished through various methods. Two commonly employed approaches are isset() and array_key_exists(). This article delves into which approach is preferable in terms of speed and clarity.

isset() versus array_key_exists()

The isset() function checks if a variable has been set and is not NULL. In case of an array, it determines if the given key is set. The other function, array_key_exists(), exclusively verifies the existence of a key within an array, irrespective of its value.

Speed Comparison

Benchmarks reveal that isset() outperforms array_key_exists() when it comes to execution speed. This can be attributed to the broader nature of isset()'s check, as it includes both the existence of a key and the value's non-NULL status. array_key_exists(), on the other hand, performs only a presence check for the key.

Precision Distinction

While isset() shines in performance, it is crucial to note that array_key_exists() provides a finer distinction. For example, in scenarios where a key exists but lacks a value or the value is NULL, isset() will return false, while array_key_exists() will still return true.

Clarity of Intent

Both isset() and array_key_exists() convey their intents clearly. isset() emphasizes the presence of a set value, whereas array_key_exists() focuses solely on the key's existence. This makes code readability more straightforward in accordance with the desired result.

The above is the detailed content of `isset()` vs. `array_key_exists()` in PHP: Which is Faster and More Precise for Array Key Checks?. For more information, please follow other related articles on the PHP Chinese website!