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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<dl>
<dt id="constant.input-post">
<strong><code>INPUT_POST</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.post.html" class="link">POST</a> variables.
</span>
</dd>
<dt id="constant.input-get">
<strong><code>INPUT_GET</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.get.html" class="link">GET</a> variables.
</span>
</dd>
<dt id="constant.input-cookie">
<strong><code>INPUT_COOKIE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.cookies.html" class="link">COOKIE</a> variables.
</span>
</dd>
<dt id="constant.input-env">
<strong><code>INPUT_ENV</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.environment.html" class="link">ENV</a> variables.
</span>
</dd>
<dt id="constant.input-server">
<strong><code>INPUT_SERVER</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.server.html" class="link">SERVER</a> variables.
</span>
</dd>
<dt id="constant.input-session">
<strong><code>INPUT_SESSION</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.session.html" class="link">SESSION</a> variables.
(not implemented yet)
</span>
</dd>
<dt id="constant.input-request">
<strong><code>INPUT_REQUEST</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
<a href="reserved.variables.request.html" class="link">REQUEST</a> variables.
(not implemented yet)
</span>
</dd>
<dt id="constant.filter-flag-none">
<strong><code>FILTER_FLAG_NONE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
No flags.
</span>
</dd>
<dt id="constant.filter-require-scalar">
<strong><code>FILTER_REQUIRE_SCALAR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Flag used to require scalar as input
</span>
</dd>
<dt id="constant.filter-require-array">
<strong><code>FILTER_REQUIRE_ARRAY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Require an array as input.
</span>
</dd>
<dt id="constant.filter-force-array">
<strong><code>FILTER_FORCE_ARRAY</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Always returns an array.
</span>
</dd>
<dt id="constant.filter-null-on-failure">
<strong><code>FILTER_NULL_ON_FAILURE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Use NULL instead of FALSE on failure.
</span>
</dd>
<dt id="constant.filter-validate-int">
<strong><code>FILTER_VALIDATE_INT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "int" filter.
</span>
</dd>
<dt id="constant.filter-validate-boolean">
<strong><code>FILTER_VALIDATE_BOOLEAN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "boolean" filter.
</span>
</dd>
<dt id="constant.filter-validate-float">
<strong><code>FILTER_VALIDATE_FLOAT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "float" filter.
</span>
</dd>
<dt id="constant.filter-validate-regexp">
<strong><code>FILTER_VALIDATE_REGEXP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "validate_regexp" filter.
</span>
</dd>
<dt id="constant.filter-validate-url">
<strong><code>FILTER_VALIDATE_URL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "validate_url" filter.
</span>
</dd>
<dt id="constant.filter-validate-email">
<strong><code>FILTER_VALIDATE_EMAIL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "validate_email" filter.
</span>
</dd>
<dt id="constant.filter-validate-ip">
<strong><code>FILTER_VALIDATE_IP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "validate_ip" filter.
</span>
</dd>
<dt id="constant.filter-validate-mac">
<strong><code>FILTER_VALIDATE_MAC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "validate_mac_address" filter.
(Available as of PHP 5.5.0)
</span>
</dd>
<dt id="constant.filter-default">
<strong><code>FILTER_DEFAULT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of default ("unsafe_raw") filter. This is equivalent to
<strong><code>FILTER_UNSAFE_RAW</code></strong>.
</span>
</dd>
<dt id="constant.filter-unsafe-raw">
<strong><code>FILTER_UNSAFE_RAW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "unsafe_raw" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-string">
<strong><code>FILTER_SANITIZE_STRING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "string" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-stripped">
<strong><code>FILTER_SANITIZE_STRIPPED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "stripped" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-encoded">
<strong><code>FILTER_SANITIZE_ENCODED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "encoded" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-special-chars">
<strong><code>FILTER_SANITIZE_SPECIAL_CHARS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "special_chars" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-email">
<strong><code>FILTER_SANITIZE_EMAIL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "email" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-url">
<strong><code>FILTER_SANITIZE_URL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "url" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-number-int">
<strong><code>FILTER_SANITIZE_NUMBER_INT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "number_int" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-number-float">
<strong><code>FILTER_SANITIZE_NUMBER_FLOAT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "number_float" filter.
</span>
</dd>
<dt id="constant.filter-sanitize-magic-quotes">
<strong><code>FILTER_SANITIZE_MAGIC_QUOTES</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "magic_quotes" filter.
</span>
</dd>
<dt id="constant.filter-callback">
<strong><code>FILTER_CALLBACK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
ID of "callback" filter.
</span>
</dd>
<dt id="constant.filter-flag-allow-octal">
<strong><code>FILTER_FLAG_ALLOW_OCTAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow octal notation (<em>0[0-7]+</em>) in "int" filter.
</span>
</dd>
<dt id="constant.filter-flag-allow-hex">
<strong><code>FILTER_FLAG_ALLOW_HEX</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow hex notation (<em>0x[0-9a-fA-F]+</em>) in "int" filter.
</span>
</dd>
<dt id="constant.filter-flag-strip-low">
<strong><code>FILTER_FLAG_STRIP_LOW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Strip characters with ASCII value less than 32.
</span>
</dd>
<dt id="constant.filter-flag-strip-high">
<strong><code>FILTER_FLAG_STRIP_HIGH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Strip characters with ASCII value greater than 127.
</span>
</dd>
<dt id="constant.filter-flag-encode-low">
<strong><code>FILTER_FLAG_ENCODE_LOW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Encode characters with ASCII value less than 32.
</span>
</dd>
<dt id="constant.filter-flag-encode-high">
<strong><code>FILTER_FLAG_ENCODE_HIGH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Encode characters with ASCII value greater than 127.
</span>
</dd>
<dt id="constant.filter-flag-encode-amp">
<strong><code>FILTER_FLAG_ENCODE_AMP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Encode <em>&</em>.
</span>
</dd>
<dt id="constant.filter-flag-no-encode-quotes">
<strong><code>FILTER_FLAG_NO_ENCODE_QUOTES</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Don't encode <em>'</em> and <em>"</em>.
</span>
</dd>
<dt id="constant.filter-flag-empty-string-null">
<strong><code>FILTER_FLAG_EMPTY_STRING_NULL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
(No use for now.)
</span>
</dd>
<dt id="constant.filter-flag-allow-fraction">
<strong><code>FILTER_FLAG_ALLOW_FRACTION</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow fractional part in "number_float" filter.
</span>
</dd>
<dt id="constant.filter-flag-allow-thousand">
<strong><code>FILTER_FLAG_ALLOW_THOUSAND</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow thousand separator (<em>,</em>) in "number_float" filter.
</span>
</dd>
<dt id="constant.filter-flag-allow-scientific">
<strong><code>FILTER_FLAG_ALLOW_SCIENTIFIC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow scientific notation (<em>e</em>, <em>E</em>) in
"number_float" filter.
</span>
</dd>
<dt id="constant.filter-flag-path-required">
<strong><code>FILTER_FLAG_PATH_REQUIRED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Require path in "validate_url" filter.
</span>
</dd>
<dt id="constant.filter-flag-query-required">
<strong><code>FILTER_FLAG_QUERY_REQUIRED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Require query in "validate_url" filter.
</span>
</dd>
<dt id="constant.filter-flag-ipv4">
<strong><code>FILTER_FLAG_IPV4</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow only IPv4 address in "validate_ip" filter.
</span>
</dd>
<dt id="constant.filter-flag-ipv6">
<strong><code>FILTER_FLAG_IPV6</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Allow only IPv6 address in "validate_ip" filter.
</span>
</dd>
<dt id="constant.filter-flag-no-res-range">
<strong><code>FILTER_FLAG_NO_RES_RANGE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Deny reserved addresses in "validate_ip" filter.
</span>
</dd>
<dt id="constant.filter-flag-no-priv-range">
<strong><code>FILTER_FLAG_NO_PRIV_RANGE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Deny private addresses in "validate_ip" filter.
</span>
</dd>
<dt id="constant.filter-flag-email-unicode">
<strong><code>FILTER_FLAG_EMAIL_UNICODE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Accepts Unicode characters in the local part in "validate_email" filter.
(Available as of PHP 7.1.0)
</span>
</dd>
</dl>
</div>
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