PHP | Determining Client IP Address

What is an IP Address?
The IP address stands for Internet Protocol Address. An IP address is used to provide an identity to a networked device.IP addresses allow the location of different digital devices that are connected to the Internet to be pinpointed and differentiated from other devices.

In this post we have discussed two different ways of determining the client IP address from a PHP script as explained below:

  • Using getenv() function: To get the IP Address,we use getenv(“REMOTE_ADDR”) command.
    The getenv() function in PHP is used for retrieval of values of an environment variable in PHP.
    It is used to return the value of a specific environmnet variable.

    Syntax :

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    <?php
     $ipaddress = getenv("REMOTE_ADDR") ;
     Echo "Your IP Address is " . $ipaddress;
    ?>

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    Output :

    Your IP is 127.1.1.0
  • Determining IP Address using $_SERVER Variable Method : There is another way to get the IP Address by using the $_SERVER[‘REMOTE_ADDR’] or $_SERVER[‘REMOTE_HOST’] variables. The variable in the $_SERVER array is created by the web server such as apache and those can be used in PHP.
    Basically $_SERVER[‘REMOTE_ADDR’]gives the IP address from which the request was sent to the web server.

    Syntax :

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    <?php
     $ipaddress = $_SERVER['REMOTE_ADDR']
     Echo "Your IP Address is " . $ipaddress;
    ?>

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    Output :

    Your IP is 127.1.1.0


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