Detailed explanation of the steps for searching array key names using the array_key_exists() function

This time I bring youarray_key_exists()FunctionSearchDetailed explanation of the steps of array key name, array_key_exists() function to search array key nameWhat are the precautions? The following is a practical case, let’s take a look.

array_key_exists() Definition and usage
array_key_exists() function determines whether the specified key exists in an array. If the key exists, it returns true, otherwise it returns false.

Syntax

array_key_exists(key,array)

Parameter Description
key Required. Specifies the key name.
array required. Specifies the input array.

Example 1,php array function array_key_exists().

"Dog","b"=>"Cat"); if (array_key_exists("a",$a)) { echo "Key exists!"; } else { echo "Key does not exist!"; } ?>

Output:
Key exists!

Example 2, PHP array function array_key_exists().

"Dog","b"=>"Cat"); if (array_key_exists("c",$a)) { echo "Key exists!"; } else { echo "Key does not exist!"; } ?>

Output:
Key does not exist!

Example 3, PHP array function array_key_exists().

Output:
Key exists!

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