Array_key_exists () function search array Key name steps

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!

Believe that you have read the case of this article you have mastered the method, more exciting please pay attention to the PHP Chinese network other related articles!

Recommended reading:

Yii framework to create scheduled tasks through console commands detailed steps

PHP7 using LIB library case code analysis based on function mode