Php Array Key Exists Function

What is array_key_exists Function?


The "array_key_exists" function checks if the given key or index exists in the array.


array_key_exists(key, array)

In the above syntax the "key" is checked for in the "array". The function returns "true" if the key is present, and "false" otherwise.

Example :

$a = array('apple' => 1, 'guava' => 4);
if (array_key_exists('apple', $a))
echo "The Key 'apple' exists";
echo "The Key 'apple' does'nt exists";
Result :

The Key 'apple' exists

In the above example the array "$a", is checked for the key 'first', since present it displays the message.

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