Differences between array_key_exists and isset in php

Differences between array_key_exists and isset in php

This article introduces the differences between array_key_exists and isset in php. For more information, see. What are the differences between array_key_exists and isset in php? 1. the array values are different. if the values are null or ''or false, isset returns false, and array_key_exists returns true. 2. the execution efficiency is different. isset is a built-in operator, array_key_exists is a php built-in function, and isset is faster. 3. when using isset to access a non-indexed array value, it will not cause an E_NOTICE php error message; 4. array_key_exists will call get_defined_vars to determine whether the array variable exists, and isset does not need;