PHP Arrays
Which array function checks if the specified key exists in the array?

array_key_exists()
arrays_key_exists()
array_key_exist()
array_keys_exists()

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PHP Arrays
There are three different kind of arrays:

Numeric array, Associative array, Dimensional array
Numeric array, String array, Multidimensional array
Numeric array, Associative array, Multidimensional array
Const array, Associative array, Multidimensional array

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