Array_key_exists () function search array Key name steps

Source: Internet
Author: User
This time to bring you array_key_exists () function search array key name steps in detail, array_key_exists () function search array Key name of the note what, the following is the actual case, take a look.

Array_key_exists () Definition and usage
The array_key_exists () function determines whether the specified key exists in an array, returns TRUE if the key exists, or false otherwise.

Grammar

Array_key_exists (Key,array)

Parameter description
Key is required. Specifies the key name.
Array required. Specifies the input array.

Example 1,php the array_key_exists () of an array function.

<?php $a =array ("a" and "Dog", "b" = "Cat"); if (Array_key_exists ("a", $a)) {echo "Key exists!";} else {echo "key does not exist!";}?>

Output:
Key exists!

Example 2,php the array_key_exists () of an array function.

<?php $a =array ("a" and "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 the array_key_exists () of an array function.

<?php $a =array ("Dog", Cat "); if (array_key_exists (0, $a)) {echo "Key exists!";} else {echo "key does not exist!";}?>

Output:
Key exists!

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