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Filtering of variables
String Handling in PHP example from a Well House Consultants training course
More on String Handling in PHP [link]

This example is described in the following article(s):
   • Filtering PHP form inputs - three ways, but which should you use? - [link]

This example references the following resources:
http://melksh.am/weather
http://melksh.am/weather
http://melksh.am/weather
http://melksh.am/weather

Source code: fvar.php Module: H107
<?php

# Filtering of variables with filter_var

$info = array("graham@wellho.net","404","0","192.168.200.199","94.169.96.233",
        "http://melksh.am/weather","Graham Ellis","Munchkin","01225 708225");

foreach ($info as $sample) {
        print ("Looking at $sample\n");
        $result = filter_var($sample, FILTER_VALIDATE_INT);
        if ($result === FALSE) {
                print "NOT an Integer\n";
        } else {
                print "Integer result - $result\n";
        }
        var_dump($result);

        $result = filter_var($sample, FILTER_VALIDATE_EMAIL);
        if ($result === FALSE) {
                print "NOT an email\n";
        } else {
                print "email result - $result\n";
        }
        var_dump($result);

        $result = filter_var($sample, FILTER_VALIDATE_URL);
        if ($result === FALSE) {
                print "NOT a url\n";
        } else {
                print "URL result - $result\n";
        }
        var_dump($result);

        $result = filter_var($sample, FILTER_VALIDATE_IP);
        if ($result === FALSE) {
                print "NOT an IP\n";
        } else {
                print "IP result - $result\n";
        }
        var_dump($result);

        $result = filter_var($sample, FILTER_VALIDATE_IP , FILTER_FLAG_NO_PRIV_RANGE);
        if ($result === FALSE) {
                print "NOT an Internet IP\n";
        } else {
                print "Wide area IP result - $result\n";
        }
        var_dump($result);

        print ("------------------------------------\n");
}

/* Sample Output .........

wizard:nov12 graham$ php fvar.php
Looking at graham@wellho.net
NOT an Integer
bool(false)
email result - graham@wellho.net
string(17) "graham@wellho.net"
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at 404
Integer result - 404
int(404)
NOT an email
bool(false)
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at 0
Integer result - 0
int(0)
NOT an email
bool(false)
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at 192.168.200.199
NOT an Integer
bool(false)
NOT an email
bool(false)
NOT a url
bool(false)
IP result - 192.168.200.199
string(15) "192.168.200.199"
NOT an Internet IP
bool(false)
------------------------------------
Looking at 94.169.96.233
NOT an Integer
bool(false)
NOT an email
bool(false)
NOT a url
bool(false)
IP result - 94.169.96.233
string(13) "94.169.96.233"
Wide area IP result - 94.169.96.233
string(13) "94.169.96.233"
------------------------------------
Looking at http://melksh.am/weather
NOT an Integer
bool(false)
NOT an email
bool(false)
URL result - http://melksh.am/weather
string(24) "http://melksh.am/weather"
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at Graham Ellis
NOT an Integer
bool(false)
NOT an email
bool(false)
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at Munchkin
NOT an Integer
bool(false)
NOT an email
bool(false)
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
Looking at 01225 708225
NOT an Integer
bool(false)
NOT an email
bool(false)
NOT a url
bool(false)
NOT an IP
bool(false)
NOT an Internet IP
bool(false)
------------------------------------
wizard:nov12 graham$ */


?>
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in PHP
 * PHP Programming
 * Beginning PHP - weekend course / hobby / club / leisure users
 * PHP Programming
 * Learning to program in PHP
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering PHP are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "String Handling in PHP" training module. You'll find a description of the topic and some other closely related examples on the "String Handling in PHP" module index page.

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You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
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