PHP definition constants are, the difference between const and define

• Const can be used in classes, define not
• Const defines a class member variable in a class that is already defined and cannot be changed. Define can only define global constants and cannot define class member variables
• Const can only be named with ordinary constants, and define may be used in an expression
• const receives only static variables, define can receive any expression
• Const is case sensitive when defining constants, and define can specify case sensitivity by a third argument (true for case insensitivity)
• Const cannot define a variable in a conditional statement

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The above describes the PHP definition constants are, the difference between const and define, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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