For this PHP code exercise, create a file named data_types.php. This file should contain the following functions:

• convert_to_int()
• convert_to_float()
• convert_to_string()
• convert_to_bool()
• convert_to_array()
• convert_to_null()

Each of these functions should accept one parameter as input. The function should convert the input into the respective data type and return the converted value. For example, convert_to_int() should return the input converted to the int data type, and convert_to_string() should return the input converted to the string data type, and so on.

If a value can not be converted you should return the following falsy value for each data type:

• Return 0 for convert_to_int()
• Return 0.0 for convert_to_float()
• Return an empty string for convert_to_string()
• Return false for convert_to_bool()
• Return [] for convert_to_array()
• Return null for convert_to_null()

There are a few special cases:

1. If an array is passed as input to convert_to_string(), it should a string representation of the elements, in order, as a comma separated list. For example, an input of [1, 2, 3] should return 1, 2, 3, an input of [1] should return 1.
2. If any of the falsy values above or the string null is passed as input to convert_to_null(), it should return null.

Review the PHP Code Exercises documentation for more details on performing code exercises.

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