Which value in php cannot be used as a constant value?

What cannot be used as a constant value in PHP is an array, because the array is a mutable data structure and does not meet the immutable constant requirements.

Which one in PHP cannot be used as a constant value?

What cannot be used as a constant value in PHP is an array.

Reason:

A constant is a fixed and immutable value, while an array is a mutable data structure whose contents can be changed at any time. Therefore, arrays cannot be declared as constants because they do not meet the requirements of immutability.

Other data types that can be used as constant values:

• Scalar data types (such as integer, floating point, string, and Boolean)
• Enumeration type
• NULL value

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