filter-php-examples-php-validation-4

  • Examples
  • Validation

  • Validation
  • Validation

    Validation

    Example #1 Validating email addresses with filter_var()

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

    if (filter_var($email_aFILTER_VALIDATE_EMAIL)) {
        echo 
    "Email address '$email_a' is considered valid.\n";
    }
    if (
    filter_var($email_bFILTER_VALIDATE_EMAIL)) {
        echo 
    "Email address '$email_b' is considered valid.\n";
    } else {
        echo 
    "Email address '$email_b' is considered invalid.\n";
    }
    ?>

    The above example will output:

    Email address 'joe@example.com' is considered valid.
    Email address 'bogus' is considered invalid.
    

    Example #2 Validating IP addresses with filter_var()

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

    if (filter_var($ip_aFILTER_VALIDATE_IP)) {
        echo 
    "IP address '$ip_a' is considered valid.";
    }
    if (
    filter_var($ip_bFILTER_VALIDATE_IP)) {
        echo 
    "IP address '$ip_b' is considered valid.";
    }
    ?>

    The above example will output:

    IP address '127.0.0.1' 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($int_aFILTER_VALIDATE_INT$options) !== FALSE) {
        echo 
    "Integer A '$int_a' is considered valid (between 0 and 3).\n";
    }
    if (
    filter_var($int_bFILTER_VALIDATE_INT$options) !== FALSE) {
        echo 
    "Integer B '$int_b' is considered valid (between 0 and 3).\n";
    }
    if (
    filter_var($int_cFILTER_VALIDATE_INT$options) !== FALSE) {
        echo 
    "Integer C '$int_c' is considered valid (between 0 and 3).\n";
    }

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

    The above example will output:

    Integer A '1' is considered valid (between 0 and 3).
    Integer C '1' is considered valid (between 0 and 3).