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

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

Output:

不存在！

The above is the detailed content of How to use php array_key_exists function. For more information, please follow other related articles on the PHP Chinese website!