PHP defines constants, the difference between const and define

• const can be used in a class, but define cannot.
• const defines class member variables in a class. Once defined, it cannot be changed. define can only define global constants, not class member variables
• const can only be named with ordinary constants, define can use expressions
• const can only receive static variables, define can receive any expression
• const is case-sensitive when defining constants Sensitive, define can specify whether it is case sensitive through the third parameter (true means case is not sensitive)
• const cannot define variables in conditional statements

').addClass('pre- numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });

The above has introduced the difference between PHP defined constants, const and define, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.