How to use php array_key_exists function

php The array_key_exists function is used to check whether the specified key name exists in an array. Its syntax is array_key_exists(key,array). The parameter key is required and refers to the specified key name. array is required and refers to the specified array.

php How to use the array_key_exists function?

Function: Check whether the specified key name exists in an array

Syntax:

array_key_exists(key,array)

Parameters:

key required. Specifies the key name.

array Required. Specifies an array.

Description: Returns true if the key name exists, and returns false if the key name does not exist.

php array_key_exists() function usage example

"西门大官人","php中文网"=>"灭绝师太"); if (array_key_exists("phpStudy",$a)) { echo "存在！"; } else { echo "不存在！"; } ?>

Output:

不存在！

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