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This article is about how PHP determines whether a given value is an array key. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

In php, you can use the array_key_exists() function to determine whether a specified value is an array key name, which checks whether a specified key name exists in an array; syntax "array_key_exists(key,array)".

Operating environment of this tutorial: Windows 7 system, PHP7.1 version, DELL G3 computer

In php, you can use the array_key_exists() function to determine whether a given value is an array key name.

The array_key_exists() function checks whether the specified key exists in an array and returns true if it exists or false if it does not.

Grammar:

array_key_exists(key,array)

Key is required. Specify the key name.

array is required. Specify the array.

Example: Determine if Volvo is an array key name

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