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Difference between require, require_once, and include?

Discussion in 'PHP' started by ignas2526, Sep 12, 2008.

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  1. #1
    Hello,
    what difference between them?
    Thanks.
     
    ignas2526, Sep 12, 2008 IP
  2. allaboutgeo

    allaboutgeo Peon

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    #2
    The require_once() statement includes and evaluates the specified file during the execution of the script. This is a behavior similar to the require() statement, with the only difference being that if the code from a file has already been included, it will not be included again.
     
    allaboutgeo, Sep 12, 2008 IP
  3. mwasif

    mwasif Active Member

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    #3
    require, require_once will throw an error if the file required is not found but include just throw a warning.
     
    mwasif, Sep 12, 2008 IP
  4. JAY6390

    JAY6390 Peon

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    #4
    require - File must be included or the script will exit with a fatal error
    require_once - Same as above, except it can only be included once

    include - same as require, except script will continue if the file is not found, and only produce a warning
    include_once - same as require_once except script will continue if the file is not found and only produce a warning

    Click on the links above for more information about each. That is what the manual is there for ;)
     
    JAY6390, Sep 12, 2008 IP