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The main content of this article is to explain "how php determines whether a specified key does not exist". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Next let the editor to take you to learn "how to determine whether the specified key does not exist" by php!

In php, you can use the "array_key_exists ()" function to determine whether the specified key does not exist. The function is to check whether the specified key name exists in an array; the syntax is "array_key_exists (key name, array)", and returns true if it exists, or false if it does.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use the "array_key_exists ()" function to determine whether the specified key does not exist.

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

Syntax:

Array_key_exists ($key,$array)

$key: required. Specify the key name.

$array: required. Specify the array.

Example: check whether the key name "Toyota" exists in the array

Tip: keep in mind that if you omit the key name when you specify the array, an integer key name that starts at 0 and increments by 1 will be generated.

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