Validation

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Example #1 Validating email addresses with filter_var()

  <?php
$email_a  =  'joe@example.com' ;
 $email_b  =  'bogus' ;

if ( filter_var ( $email_a ,  FILTER_VALIDATE_EMAIL )) {
    echo  "This ( $email_a ) email address is considered valid." ;
}
if ( filter_var ( $email_b ,  FILTER_VALIDATE_EMAIL )) {
    echo  "This ( $email_b ) email address is considered valid." ;
}
 ?>

以上例程会输出：

This (joe@example.com) email address is considered valid.

Example #2 Validating IP addresses with filter_var()

  <?php
$ip_a  =  '127.0.0.1' ;
 $ip_b  =  '42.42' ;

if ( filter_var ( $ip_a ,  FILTER_VALIDATE_IP )) {
    echo  "This (ip_a) IP address is considered valid." ;
}
if ( filter_var ( $ip_b ,  FILTER_VALIDATE_IP )) {
    echo  "This (ip_b) IP address is considered valid." ;
}
 ?>

以上例程会输出：

This (ip_a) IP address is considered valid.

Example #3 Passing options to filter_var()

  <?php
$int_a  =  '1' ;
 $int_b  =  '-1' ;
 $int_c  =  '4' ;
 $options  = array(
     'options'  => array(
                       'min_range'  =>  0 ,
                       'max_range'  =>  3 ,
                      )
);
if ( filter_var ( $int_a ,  FILTER_VALIDATE_INT ,  $options ) !==  FALSE ) {
    echo  "This (int_a) integer is considered valid (between 0 and 3).\n" ;
}
if ( filter_var ( $int_b ,  FILTER_VALIDATE_INT ,  $options ) !==  FALSE ) {
    echo  "This (int_b) integer is considered valid (between 0 and 3).\n" ;
}
if ( filter_var ( $int_c ,  FILTER_VALIDATE_INT ,  $options ) !==  FALSE ) {
    echo  "This (int_c) integer is considered valid (between 0 and 3).\n" ;
}

 $options [ 'options' ][ 'default' ] =  1 ;
if (( $int_c  =  filter_var ( $int_c ,  FILTER_VALIDATE_INT ,  $options )) !==  FALSE ) {
    echo  "This (int_c) integer is considered valid (between 0 and 3) and is  $int_c ." ;
}
 ?>

以上例程会输出：

This (int_a) integer is considered valid (between 0 and 3).
This (int_c) integer is considered valid (between 0 and 3) and is 1.

用户评论:

[#1] ghazouanijs at gmail dot com [2015-01-20 15:49:51]

invalid email skip this filter
example : gnix@lineone.netsteve.gynes@lane4.co.uk

[#2] makicar5 at gmail dot com [2014-01-20 15:28:51]

Email example is correct, in other examples just add dollar sign:

echo "This (ip_a) IP address is considered valid.";
echo "This (ip_a) IP address is considered valid.";

Change to:

echo "This ($ip_a) IP address is considered valid.";
echo "This ($ip_a) IP address is considered valid.";

same for
int_a, int_b, int_c
to $int_a, $int_b, $int_c

Don't use single quotes in this example!

[#3] brokendocs at php dot net [2013-11-08 13:50:25]

all the above documentation is slightly incorrect, the output is not reading the variables in -

code:

$email_a = 'joe@example.com';
$email_b = 'bogus';

if (filter_var($email_a, FILTER_VALIDATE_EMAIL)) {
echo "This ($email_a) email address is considered valid.";
}

output:

This (email_a) email address is considered valid.

should be output:

This (joe@example.com) email address is considered valid.

same for the IP and integer examples.

[#4] Stan [2013-09-11 10:02:55]

HP 5.3.3 and 5.2.14 had a bug (http://bugs.php.net/52929) related to FILTER_VALIDATE_EMAIL, which resulted in segfault when validating large values. Simple and safe workaround for this is using strlen() before filter_val(). I'm not sure about 5.3.4 final, but it is written that some 5.3.4-snapshot versions also were affected.

Originally posted here - http://stackoverflow.com/questions/5855811/how-to-validate-an-email-in-php#comment6729146_5855853.