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><DIV
CLASS="reference"
><A
NAME="ref.filter"
></A
><DIV
CLASS="TITLEPAGE"
><H1
CLASS="title"
>XLI. Filter Functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN55069"
></A
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.intro"
>简介</A
></H1
><P
> This extension serves for validating and filtering data coming usually
from some insecure source such as user input.
</P
><P
> The following filters currently exist, be sure to read the
<A
HREF="ref.filter.html#filter.constants"
>Filter Constants</A
> section
for information that describes the behavior of each constant:
<DIV
CLASS="table"
><A
NAME="AEN55075"
></A
><P
><B
>表 1. Existing filters</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>ID</TH
><TH
>Name</TH
><TH
>Options</TH
><TH
>Flags</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_INT</B
></TT
></TD
><TD
>"int"</TD
><TD
> <CODE
CLASS="parameter"
>min_range</CODE
>,
<CODE
CLASS="parameter"
>max_range</CODE
>
</TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_OCTAL</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_HEX</B
></TT
>
</TD
><TD
>Validates value as integer, optionally from the specified range.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_BOOLEAN</B
></TT
></TD
><TD
>"boolean"</TD
><TD
> </TD
><TD
> </TD
><TD
> Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> for "1", "true", "on" and "yes",
<TT
CLASS="constant"
><B
>FALSE</B
></TT
> for "0", "false", "off", "no", and "",
<TT
CLASS="constant"
><B
>NULL</B
></TT
> otherwise.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_FLOAT</B
></TT
></TD
><TD
>"float"</TD
><TD
> </TD
><TD
> </TD
><TD
>Validates value as float.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_REGEXP</B
></TT
></TD
><TD
>"validate_regexp"</TD
><TD
> <CODE
CLASS="parameter"
>regexp</CODE
>
</TD
><TD
> </TD
><TD
> Validates value against <CODE
CLASS="parameter"
>regexp</CODE
>, a
<A
HREF="ref.pcre.html"
>Perl-compatible</A
> regular expression.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_URL</B
></TT
></TD
><TD
>"validate_url"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_SCHEME_REQUIRED</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_HOST_REQUIRED</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_PATH_REQUIRED</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_QUERY_REQUIRED</B
></TT
>
</TD
><TD
>Validates value as URL, optionally with required components.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_EMAIL</B
></TT
></TD
><TD
>"validate_email"</TD
><TD
> </TD
><TD
> </TD
><TD
>Validates value as e-mail.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_IP</B
></TT
></TD
><TD
>"validate_ip"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_IPV4</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_IPV6</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_NO_PRIV_RANGE</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_NO_RES_RANGE</B
></TT
>
</TD
><TD
> Validates value as IP address, optionally only IPv4 or IPv6 or not
from private or reserved ranges.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_STRING</B
></TT
></TD
><TD
>"string"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_NO_ENCODE_QUOTES</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_AMP</B
></TT
>
</TD
><TD
>Strip tags, optionally strip or encode special characters.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_STRIPPED</B
></TT
></TD
><TD
>"stripped"</TD
><TD
> </TD
><TD
> </TD
><TD
>Alias of "string" filter.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_ENCODED</B
></TT
></TD
><TD
>"encoded"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_HIGH</B
></TT
>
</TD
><TD
>URL-encode string, optionally strip or encode special characters.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_SPECIAL_CHARS</B
></TT
></TD
><TD
>"special_chars"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_HIGH</B
></TT
>
</TD
><TD
> HTML-escape <TT
CLASS="literal"
>'"<>&</TT
> and characters with
ASCII value less than 32, optionally strip or encode other special
characters.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_UNSAFE_RAW</B
></TT
></TD
><TD
>"unsafe_raw"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_LOW</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_HIGH</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_AMP</B
></TT
>
</TD
><TD
>Do nothing, optionally strip or encode special characters.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_EMAIL</B
></TT
></TD
><TD
>"email"</TD
><TD
> </TD
><TD
> </TD
><TD
> Remove all characters except letters, digits and
<TT
CLASS="literal"
>!#$%&'*+-/=?^_`{|}~@.[]</TT
>.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_URL</B
></TT
></TD
><TD
>"url"</TD
><TD
> </TD
><TD
> </TD
><TD
> Remove all characters except letters, digits and
<TT
CLASS="literal"
>$-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=</TT
>.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_NUMBER_INT</B
></TT
></TD
><TD
>"number_int"</TD
><TD
> </TD
><TD
> </TD
><TD
> Remove all characters except digits and <TT
CLASS="literal"
>+-</TT
>.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_NUMBER_FLOAT</B
></TT
></TD
><TD
>"number_float"</TD
><TD
> </TD
><TD
> <TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_FRACTION</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_THOUSAND</B
></TT
>,
<TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_SCIENTIFIC</B
></TT
>
</TD
><TD
> Remove all characters except digits, <TT
CLASS="literal"
>+-</TT
> and
optionally <TT
CLASS="literal"
>.,eE</TT
>.
</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_MAGIC_QUOTES</B
></TT
></TD
><TD
>"magic_quotes"</TD
><TD
> </TD
><TD
> </TD
><TD
>Apply <A
HREF="function.addslashes.html"
><B
CLASS="function"
>addslashes()</B
></A
>.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>FILTER_CALLBACK</B
></TT
></TD
><TD
>"callback"</TD
><TD
> </TD
><TD
><A
HREF="language.pseudo-types.html#language.types.callback"
><B
CLASS="type"
>callback</B
></A
> function or method</TD
><TD
>Call user-defined function to filter data.</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.requirements"
>需求</A
></H1
><P
>要编译本扩展模块无需外部库文件。</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.installation"
>安装</A
></H1
><P
> A short installation note: just type
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>$ pecl install filter</PRE
></TD
></TR
></TABLE
>
in your console.
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.configuration"
>运行时配置</A
></H1
><P
>这些函数的行为受 <TT
CLASS="filename"
>php.ini</TT
> 的影响。</P
><P
> <DIV
CLASS="table"
><A
NAME="AEN55271"
></A
><P
><B
>表 2. Filter Configuration Options</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Default</TH
><TH
>Changeable</TH
><TH
>Changelog</TH
></TR
></THEAD
><TBODY
><TR
><TD
>filter.default</TD
><TD
>unsafe_raw</TD
><TD
>PHP_INI_PERDIR</TD
><TD
> </TD
></TR
><TR
><TD
>filter.default_flags</TD
><TD
> </TD
><TD
>PHP_INI_PERDIR</TD
><TD
> </TD
></TR
></TBODY
></TABLE
></DIV
>
有关 PHP_INI_* 常量进一步的细节与定义参见<A
HREF="ini.html"
>附录 H</A
>。
</P
><P
>以下是配置选项的简要解释。</P
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><A
NAME="ini.filter.default"
></A
><CODE
CLASS="parameter"
>filter.default</CODE
>
<A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
></DT
><DD
><P
> Filter all $_GET, $_POST, $_COOKIE and $_REQUEST data by this filter.
Original data can be accessed through <A
HREF="function.filter-input.html"
><B
CLASS="function"
>filter_input()</B
></A
>.
</P
><P
> Accepts the name of the filter you like to use by default. See the
existing filter list for the list of the filter names.
</P
></DD
><DT
><A
NAME="ini.filter.default-flags"
></A
><CODE
CLASS="parameter"
>filter.default_flags</CODE
>
<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
></DT
><DD
><P
> Default flags
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.resources"
>资源类型</A
></H1
><P
>本扩展模块未定义任何资源类型。</P
></DIV
><DIV
CLASS="section"
><H1
CLASS="section"
><A
NAME="filter.constants"
>预定义常量</A
></H1
><P
>以下常量由本扩展模块定义，因此只有在本扩展模块被编译到
PHP 中，或者在运行时被动态加载后才有效。</P
><P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><TT
CLASS="constant"
><B
>INPUT_POST</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.post"
>POST</A
> variables.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_GET</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.get"
>GET</A
> variables.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_COOKIE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.cookies"
>COOKIE</A
> variables.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_ENV</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.environment"
>ENV</A
> variables.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_SERVER</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.server"
>SERVER</A
> variables.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_SESSION</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.session"
>SESSION</A
> variables.
(not implemented yet)
</P
></DD
><DT
><TT
CLASS="constant"
><B
>INPUT_REQUEST</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> <A
HREF="reserved.variables.html#reserved.variables.request"
>REQUEST</A
> variables.
(not implemented yet)
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_NONE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> No flags.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_REQUIRE_SCALAR</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Flag used to require scalar as input
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_REQUIRE_ARRAY</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Require an array as input.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FORCE_ARRAY</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Always returns an array.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_NULL_ON_FAILURE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Use NULL instead of FALSE on failure.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_INT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "int" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_BOOLEAN</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "boolean" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_FLOAT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "float" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_REGEXP</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "validate_regexp" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_URL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "validate_url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_EMAIL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "validate_email" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_VALIDATE_IP</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "validate_ip" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_DEFAULT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of default ("string") filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_UNSAFE_RAW</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "unsafe_raw" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_STRING</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "string" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_STRIPPED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "stripped" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_ENCODED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "encoded" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_SPECIAL_CHARS</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "special_chars" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_EMAIL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "email" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_URL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_NUMBER_INT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "number_int" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_NUMBER_FLOAT</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "number_float" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_SANITIZE_MAGIC_QUOTES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "magic_quotes" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_CALLBACK</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> ID of "callback" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_OCTAL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow octal notation (<TT
CLASS="literal"
>0[0-7]+</TT
>) in "int" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_HEX</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow hex notation (<TT
CLASS="literal"
>0x[0-9a-fA-F]+</TT
>) in "int" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_LOW</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Strip characters with ASCII value less than 32.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_STRIP_HIGH</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Strip characters with ASCII value greater than 127.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_LOW</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Encode characters with ASCII value less than 32.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_HIGH</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Encode characters with ASCII value greater than 127.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ENCODE_AMP</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Encode <TT
CLASS="literal"
>&</TT
>.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_NO_ENCODE_QUOTES</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Don't encode <TT
CLASS="literal"
>'</TT
> and <TT
CLASS="literal"
>"</TT
>.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_EMPTY_STRING_NULL</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> (No use for now.)
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_FRACTION</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow fractional part in "number_float" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_THOUSAND</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow thousand separator (<TT
CLASS="literal"
>,</TT
>) in "number_float" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_ALLOW_SCIENTIFIC</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow scientific notation (<TT
CLASS="literal"
>e</TT
>, <TT
CLASS="literal"
>E</TT
>) in
"number_float" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_SCHEME_REQUIRED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Require scheme in "validate_url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_HOST_REQUIRED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Require host in "validate_url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_PATH_REQUIRED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Require path in "validate_url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_QUERY_REQUIRED</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Require query in "validate_url" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_IPV4</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow only IPv4 address in "validate_ip" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_IPV6</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Allow only IPv6 address in "validate_ip" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_NO_RES_RANGE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Deny reserved addresses in "validate_ip" filter.
</P
></DD
><DT
><TT
CLASS="constant"
><B
>FILTER_FLAG_NO_PRIV_RANGE</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Deny private addresses in "validate_ip" filter.
</P
></DD
></DL
></DIV
></DIV
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.filter-has-var.html"
>filter_has_var</A
> -- Checks if variable of specified type exists</DT
><DT
><A
HREF="function.filter-id.html"
>filter_id</A
> -- Returns the filter ID belonging to a named filter</DT
><DT
><A
HREF="function.filter-input-array.html"
>filter_input_array</A
> -- Gets multiple variables from outside PHP and optionally filters them</DT
><DT
><A
HREF="function.filter-input.html"
>filter_input</A
> -- Gets variable from outside PHP and optionally filters it</DT
><DT
><A
HREF="function.filter-list.html"
>filter_list</A
> -- Returns a list of all supported filters</DT
><DT
><A
HREF="function.filter-var-array.html"
>filter_var_array</A
> -- Gets multiple variables and optionally filters them</DT
><DT
><A
HREF="function.filter-var.html"
>filter_var</A
> -- Filters a variable with a specified filter</DT
></DL
></DIV
></DIV
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="function.unlink.html"
ACCESSKEY="P"
>上一页</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>起始页</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="function.filter-has-var.html"
ACCESSKEY="N"
>下一页</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>unlink</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="funcref.html"
ACCESSKEY="U"
>上一级</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
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>filter_has_var</TD
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