PHP: Filtros de validación

Filtros de validación

**Listado de filtros para validación**
ID	Nombre	Opciones	Banderas	Descripción
`FILTER_VALIDATE_BOOLEAN`, `FILTER_VALIDATE_BOOL`	"boolean"	`default`	`FILTER_NULL_ON_FAILURE`	Devuelve `true` para "1", "true", "on" y "yes". Devuelve `false` en caso contrario. Si `FILTER_NULL_ON_FAILURE` está declarado, se devolverá `false` sólo para "0", "false", "off", "no", y "", y `null` para cualquier valor no booleano. Los valores String se recortan utilizando trim() antes de la comparación.
`FILTER_VALIDATE_DOMAIN`	"validate_domain"	`default`	`FILTER_FLAG_HOSTNAME`, `FILTER_NULL_ON_FAILURE`	Valida si las longitudes de las etiquetas de los nombres de dominio son válidas. Valida los nombres de dominio según el RFC 1034, RFC 1035, RFC 952, RFC 1123, RFC 2732, RFC 2181, y RFC 1123. Bandera opcional `FILTER_FLAG_HOSTNAME` añade la capacidad de validar específicamente los nombres de host (deben comenzar con un alfanumérico y contener sólo caracteres alfanuméricos o guiones).
`FILTER_VALIDATE_EMAIL`	"validate_email"	`default`	`FILTER_FLAG_EMAIL_UNICODE`, `FILTER_NULL_ON_FAILURE`	Valida una dirección de correo electrónico. En general, se validan direcciones de correo electrónico con la sintaxis `addr-spec` del » RFC 822, con la excepción de no admitir el plegamiento de comentarios y dominios con espacios en blanco no son compatibles.
`FILTER_VALIDATE_FLOAT`	"float"	`default`, `decimal`, `min_range`, `max_range`	`FILTER_FLAG_ALLOW_THOUSAND`, `FILTER_NULL_ON_FAILURE`	Valida si el valor es un float, opcionalmente del rango especificado, y lo convierte a float si tiene éxito. Los valores de los string se recortan con usando trim() antes de la comparación.
`FILTER_VALIDATE_INT`	"int"	`default`, `min_range`, `max_range`	`FILTER_FLAG_ALLOW_OCTAL`, `FILTER_FLAG_ALLOW_HEX`, `FILTER_NULL_ON_FAILURE`	Valida un valor como integer, opcionalmente desde el rango especificado, y lo convierte a int en caso de éxito. Los valores de los string se recortan con usando trim() antes de la comparación.
`FILTER_VALIDATE_IP`	"validate_ip"	`default`	`FILTER_FLAG_IPV4`, `FILTER_FLAG_IPV6`, `FILTER_FLAG_NO_PRIV_RANGE`, `FILTER_FLAG_NO_RES_RANGE`, `FILTER_NULL_ON_FAILURE`	Valida si es valor es una dirección IP, opcionalmente se puede indicar que sea sólo IPv4 o IPv6 o que no sea de rangos privados o reservados.
`FILTER_VALIDATE_MAC`	"validate_mac_address"	`default`	`FILTER_NULL_ON_FAILURE`	Valida una dirección MAC.
`FILTER_VALIDATE_REGEXP`	"validate_regexp"	`default`, `regexp`	`FILTER_NULL_ON_FAILURE`	Valida el valor contra `regexp`, una expresión regular Perl-compatible.
`FILTER_VALIDATE_URL`	"validate_url"	`default`	`FILTER_FLAG_SCHEME_REQUIRED`, `FILTER_FLAG_HOST_REQUIRED`, `FILTER_FLAG_PATH_REQUIRED`, `FILTER_FLAG_QUERY_REQUIRED`, `FILTER_NULL_ON_FAILURE`	Valida si su valor es una URL (de acuerdo con » https://datatracker.ietf.org/doc/html/rfc2396), opcionalmente con componentes necesarios. Se ha de tener cuidado ya que un URL válida podría no especificar el protocolo HTTP `http://`, por lo que podrían ser necesarias validaciones posteriores para determinar que el URL utiliza un protocolo esperado, p.ej., `ssh://` o `mailto:`. Nótese que esta función sólo buscará para ser validadas URLs ASCII; los nombres de dominio internacionales (que contienen no-ASCII caracteres) fallarán en la validación.

Nota:
Cuando default está establecido a option, se utilizará el valor de default si el valor no es validado.

Historial de cambios

Versión	Descripción
8.0.0	The `FILTER_FLAG_SCHEME_REQUIRED` and `FILTER_FLAG_HOST_REQUIRED` flags for the `FILTER_VALIDATE_URL` filter have been removed. The `scheme` and `host` are (and have been) always required.
8.0.0	Added `FILTER_VALIDATE_BOOL` as an alias for `FILTER_VALIDATE_BOOLEAN`. Using `FILTER_VALIDATE_BOOL` is preferred.
7.4.0	Added `min_range` and `max_range` options for `FILTER_VALIDATE_FLOAT`.
7.0.0	Added `FILTER_FLAG_HOSTNAME` and `FILTER_VALIDATE_DOMAIN`.

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User Contributed Notes 14 notes

down

boy at relaxnow dot nl ¶

12 years ago

FILTER_VALIDATE_URL does not work with URNs, examples of valid URIs according to RFC3986 and if they are accepted by FILTER_VALIDATE_URL:



[PASS] ftp://ftp.is.co.za.example.org/rfc/rfc1808.txt

[PASS] gopher://spinaltap.micro.umn.example.edu/00/Weather/California/Los%20Angeles

[PASS] http://www.math.uio.no.example.net/faq/compression-faq/part1.html

[PASS] mailto:mduerst@ifi.unizh.example.gov

[PASS] news:comp.infosystems.www.servers.unix

[PASS] telnet://melvyl.ucop.example.edu/

[PASS] http://www.ietf.org/rfc/rfc2396.txt

[PASS] ldap://[2001:db8::7]/c=GB?objectClass?one

[PASS] mailto:John.Doe@example.com

[PASS] news:comp.infosystems.www.servers.unix

[FAIL] tel:+1-816-555-1212

[PASS] telnet://192.0.2.16:80/

[FAIL] urn:oasis:names:specification:docbook:dtd:xml:4.1.2

down

bee kay two at em ee dot com ¶

12 years ago

Notably missing is a way to validate text entry as printable,
printable multiline,
or printable and safe (tag free)

FILTER_VALIDATE_TEXT, which validates no special characters
perhaps with FILTER_FLAG_ALLOW_NEWLINE
and FILTER_FLAG_NOTAG to disallow tag starters

down

MR Yekta ¶

4 years ago

since php 7.4 
you can use these 3 beautiful conditions for from validation for validation less, great or in range

<?php
/**
 * less_than_equal_to
 */
$x = 50;
if (filter_var($x, FILTER_VALIDATE_FLOAT, ["options" => ["max_range" => 100]]) !== false) {
    echo "result : $x is less than OR equal to 100";
} else {
    echo "result : $x is NOT less than OR equal to 100";
}
?>
result : 50 is less than OR equal to 100

<?php
/**
 * greater_than_equal_to 
 */
$x = 50;
if (filter_var($x, FILTER_VALIDATE_FLOAT, ["options" => ["min_range" => 100]]) !== false) {
    echo "result : $x is greater than OR equal to 100";
} else {
    echo "result : $x is NOT greater than OR equal to 100";
}
?>
result : 50 is NOT greater than OR equal to 100

<?php
/**
 * less_than_equal_to && greater_than_equal_to
 */
$x = 50;
if (filter_var($x, FILTER_VALIDATE_FLOAT, ["options" => ["min_range" => 0 , "max_range"=> 100]]) !== false) {
    echo "result : $x is in range of 0 to 100";
} else {
    echo "result : $x in NOT range of 0 to 100";
}
?>
result : 50 is in range of 0 to 100

down

bryanwayb at gmail dot com ¶

9 years ago

It's good to remember that using filter_var is primarily for filtering input values when doing boolean logic comparisons. Take the following:

$value = "12";
if(filter_var($value, FILTER_VALIDATE_INT))
{
    // validated as an int
}

The above works as intended, except when $value = "0". In which case filter_var returns a 0, aka false when used as a boolean.

For the correct behavior, do a zero check.

$value = " 0 ";
$filtered = filter_var($value, FILTER_VALIDATE_INT);
if($filtered || $filtered === 0)
{
    // validated as an int
}

down

Clifton ¶

13 years ago

FILTER_VALIDATE_EMAIL does NOT allow incomplete e-mail addresses to be validated as mentioned by Tomas.



Using the following code:



<?php

$email = "clifton@example"; //Note the .com missing

echo "PHP Version: ".phpversion().'<br>';

if(filter_var($email, FILTER_VALIDATE_EMAIL)){

    echo $email.'<br>';

    var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));

}else{

    var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));    

}

?>



Returns:

PHP Version: 5.2.14 //On MY server, may be different depending on which version you have installed.

bool(false)



While the following code:



<?php

$email = "clifton@example.com"; //Note the .com added

echo "PHP Version: ".phpversion().'<br>';

if(filter_var($email, FILTER_VALIDATE_EMAIL)){

    echo $email.'<br>';

    var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));

}else{

    var_dump(filter_var($email, FILTER_VALIDATE_EMAIL));    

}

?>



Returns:

PHP Version: 5.2.14 //On MY server, may be different depending on which version you have installed.

clifton@example.com

string(16) "clifton@example.com"



This feature is only available for PHP Versions (PHP 5 >= 5.2.0) according to documentation. So make sure your version is correct.



Cheers,

Clifton

down

sebastian dot piskorski at gmail dot com ¶

8 years ago

FILTER_VALIDATE_EMAIL not only doesn't support whitespace folding and comments. It only checks Addr-spec part of email address. Otherwise it should mark such address as valid: 'Test Example <test@example.com>' because it is valid according to RFC 822.

Also address "test@localhost" should be valid. Which is mentioned in another note.

You can test it with this code:
<?php

$emails = array(
    'Test Example <test@example.com>',
    'test@localhost',
    'test@localhost.com'
);

foreach ($emails as $email) {
    echo (filter_var($email, FILTER_VALIDATE_EMAIL)) ? 
        "[+] Email '$email' is valid\n" : 
        "[-] Email '$email' is NOT valid\n";
}
?>

Output for PHP 5.3.21 - 7.0.1 :
[-] Email 'Test Example <test@example.com>' is NOT valid
[-] Email 'test@localhost' is NOT valid
[+] Email 'test@localhost.com' is valid

down

Lech ¶

9 years ago

The description for FILTER_VALIDATE_URL seems incorrect/misleading. "Beware a valid URL may not specify the HTTP protocol" implies a valid URL cannot specify the HTTP protocol. I think "Beware a valid URL need not specify..." would be better.

down

php dot net at piskvor dot org ¶

13 years ago

FILTER_VALIDATE_EMAIL is discarding valid e-mail addresses containing IDN. Since there are real, live IDNs on the Internet, that means the filtered output is too strict, leading to false negatives.

Punycode-encoded IDN addresses pass the filter correctly; so before checking for validity, it is necessary to convert the e-mail address to punycode.

down

rowan dot collins at gmail dot com ¶

11 years ago

Regarding "partial" addresses with no . in the domain part, a comment in the source code (in ext/filter/logical_filters.c) justifies this rejection thus:

     * The regex below is based on a regex by Michael Rushton.
     * However, it is not identical.  I changed it to only consider routeable
     * addresses as valid.  Michael's regex considers a@b a valid address
     * which conflicts with section 2.3.5 of RFC 5321 which states that:
     *
     *   Only resolvable, fully-qualified domain names (FQDNs) are permitted
     *   when domain names are used in SMTP.  In other words, names that can
     *   be resolved to MX RRs or address (i.e., A or AAAA) RRs (as discussed
     *   in Section 5) are permitted, as are CNAME RRs whose targets can be
     *   resolved, in turn, to MX or address RRs.  Local nicknames or
     *   unqualified names MUST NOT be used.

down

gee2711 at googlemail dot com ¶

6 years ago

FILTER_FLAG_QUERY_REQUIRED is failing URLs that are encoded e.g.

http://example.com/page.php?q=growing+big

Fails whilst

http://example.com/page.php?q=big

So anything more than one word encoded fails.

Tested on PHP version 7.1

down

kizge ¶

8 years ago

FILTER_VALIDATE_INT first casts its value to string which produces unexpected result for bool and float (https://bugs.php.net/bug.php?id=72490):

<?php

// Prints int(1).
var_dump(filter_var(true, FILTER_VALIDATE_INT));

// ...but this prints bool(false).
var_dump(filter_var(false, FILTER_VALIDATE_INT));

// --------

// Prints bool(false).
var_dump(filter_var(1.1, FILTER_VALIDATE_INT));

// ...but this prints int(0).
var_dump(filter_var(0.0, FILTER_VALIDATE_INT));

// ...but this again is bool(false).
var_dump(filter_var('0.0', FILTER_VALIDATE_INT));

// Also bool(false).
var_dump(filter_var('-0.0', FILTER_VALIDATE_INT));

?>

Live sample: https://3v4l.org/CZW0W

The docs are not clear on how exactly this casting affects the result for certain input values.

down

Bastien ¶

11 years ago

Rejection of so-called partial domains because of "missing" dot is not following section 2.3.5 of RFC 5321.

It says FQDNs are permitted, and com, org, or va are (well, may be) valids FQDNs. It depends on DNS, not on syntax.

Some TDLs (although few of them) have MX RRs, the for example "abuse@va" is correct.

down

rsnell at usgs dot gov ¶

9 years ago

Note that if using FILTER_NULL_ON_FAILURE as a flag with the FILTER_VALIDATE_BOOLEAN id then NULL is no longer returned if the variable name is not set in the external variable array. It will instead return FALSE. In the description is says that when using the FILTER_NULL_ON_FAILURE flag that ' FALSE is returned only for "0", "false", "off", "no", and ""' an makes no mention of this additional state that can also return false. The behavior is mentioned on the filter_input documentation page under Return Values but that is not overly helpful if one is just looking here.

If FILTER_NULL_ON_FAILURE is not used then NULL is returned when the variable name is not set in the external variable array, TRUE is returned for "1", "true", "on" and "yes" and FALSE is returned for everything else.

down

maruerru at gmail dot com ¶

9 years ago

Often I see some code like the following:
$value = "12";
if( filter_var($value, FILTER_VALIDATE_INT) )
{
    // validated as an int
}

The above works as intended, except when $value is "0". In the above case it will be interpreted as FALSE.

For the correct behavior,  you have not only to check if it is equal (==) to false, but also identic (===) to FALSE:
$value = " 0 ";
if( filter_var($value, FILTER_VALIDATE_INT)  === FALSE )
{
    // validated as an int
}

I hope, I could help.

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