如何检查PHP中哈希表中是否存在密钥？

Question

At the moment I initialize as follows:

$my_hash = array();

Populate like this:

$my_hash[$key] = $value;

However when I check for my key as follows

if ($my_hash[$key])

The server throws up an error. How to I check for my key?

Answer 1

if(array_key_exists($key, $my_hash)){
    // do your stuff
}

It's not exactly a hash table. It's an array data type in PHP.

More operations on arrays can be seen here: http://php.net/manual/en/ref.array.php