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How to detect if this dictionary key exists in PHP?

The array_key_exists() function checks an array for a specified key, and returns true if the key exists and false if the key does not exist.

php key_exists

PHP function key_exists($key, array $array) bool
Checks if the given key or index exists in the array. The name of this function is array_key_exists() in PHP > 4.0.6.

int|string--$key--Value to check.
array--$array--An array with keys to check.
Returns:true on success or false on failure.

Example 2

if (array_key_exists("Toyota",$a))
  echo "Key exists!";
  echo "Key does not exist!";


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