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What is the difference between define() and const in PHP?

Damian99Damian99 USAMember Posts: 116

Please explain me the main difference between define() and const.

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  • DavidMDavidM USAMember Posts: 342

    This explains well.

  • JohnYXJohnYX CebuMember Posts: 3
    edited November 2014

    const could not be used in the global scope. You could only use this from within a class. This should be used when you want to set some kind of constant option or setting that pertains to that class. Or maybe you want to create some kind of enum.

    define can be used for the same purpose, but it can only be used in the global scope. It should only be used for global settings that affect the entire application.

  • william stevewilliam steve kakkanadMember Posts: 3

    A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script ..it could not be used in the global scope. You could only use this from within a class. This should be used when you want to set some kind of constant option or setting that pertains to that class. Or maybe you want to create some kind of enum.http://cedarsoftware.co.uk/webapplications/

    define can be used for the same purpose, but it can only be used in the global scope. It should only be used for global settings that affect the entire application.

  • william stevewilliam steve kakkanadMember Posts: 3

    A constant is an identifier (name) for a simple value. As the name suggests, that value cannot change during the execution of the script ..it could not be used in the global scope. You could only use this from within a class. This should be used when you want to set some kind of constant option or setting that pertains to that class. Or maybe you want to create some kind of enum.( http://cedarsolutions.in )

    define can be used for the same purpose, but it can only be used in the global scope. It should only be used for global settings that affect the entire application.

  • AgriyaAgriya IndiaMember Posts: 2

    Const defines constants at compile time and is a variable that doesn't change in value. Since define() is an immediate value, which defines them at run time. You can assert a pointer to a const, but can not to a define(), even though a define() can be a pointer.
    consts are always case sensitive, but define() allows you to define case insensitive. Unless you need any type of conditional definition, you can use const instead of define(), simply for the sake of readability.

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