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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="para">
<dl>
<dt id="constant.intl-max-locale-len">
<span class="term">
<strong><code>INTL_MAX_LOCALE_LEN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Limit on locale length, set to 80 in PHP code. Locale names longer
than this limit will not be accepted.
</span>
</dd>
</dt>
<dt id="constant.idna-default">
<span class="term">
<strong><code>IDNA_DEFAULT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Prohibit processing of unassigned codepoints in the input for IDN
functions and do not check if the input conforms to domain name ASCII rules.
</span>
</dd>
</dt>
<dt id="constant.idna-allow-unassigned">
<span class="term">
<strong><code>IDNA_ALLOW_UNASSIGNED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Allow processing of unassigned codepoints in the input for IDN functions.
</span>
</dd>
</dt>
<dt id="constant.idna-use-std3-rules">
<span class="term">
<strong><code>IDNA_USE_STD3_RULES</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Check if the input for IDN functions conforms to domain name ASCII rules.
</span>
</dd>
</dt>
<dt id="constant.idna-check-bidi">
<span class="term">
<strong><code>IDNA_CHECK_BIDI</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Check whether the input conforms to the BiDi rules.
Ignored by the IDNA2003 implementation, which always performs this check.
</span>
</dd>
</dt>
<dt id="constant.idna-check-contextj">
<span class="term">
<strong><code>IDNA_CHECK_CONTEXTJ</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Check whether the input conforms to the CONTEXTJ rules.
Ignored by the IDNA2003 implementation, as this check is new in IDNA2008.
</span>
</dd>
</dt>
<dt id="constant.idna-nontransitional-to-ascii">
<span class="term">
<strong><code>IDNA_NONTRANSITIONAL_TO_ASCII</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Option for nontransitional processing in
<span class="function"><a href="function.idn-to-ascii.html" class="function">idn_to_ascii()</a></span>. Transitional processing is activated
by default. This option is ignored by the IDNA2003 implementation.
</span>
</dd>
</dt>
<dt id="constant.idna-nontransitional-to-unicode">
<span class="term">
<strong><code>IDNA_NONTRANSITIONAL_TO_UNICODE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Option for nontransitional processing in
<span class="function"><a href="function.idn-to-utf8.html" class="function">idn_to_utf8()</a></span>. Transitional processing is activated
by default. This option is ignored by the IDNA2003 implementation.
</span>
</dd>
</dt>
<dt id="constant.intl-idna-variant-2003">
<span class="term">
<strong><code>INTL_IDNA_VARIANT_2003</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Use IDNA 2003 algorithm in <span class="function"><a href="function.idn-to-utf8.html" class="function">idn_to_utf8()</a></span> and
<span class="function"><a href="function.idn-to-ascii.html" class="function">idn_to_ascii()</a></span>. This is the default.
</span>
</dd>
</dt>
<dt id="constant.intl-idna-variant-uts46">
<span class="term">
<strong><code>INTL_IDNA_VARIANT_UTS46</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Use UTS #46 algorithm in <span class="function"><a href="function.idn-to-utf8.html" class="function">idn_to_utf8()</a></span> and
<span class="function"><a href="function.idn-to-ascii.html" class="function">idn_to_ascii()</a></span>.
</span>
</dd>
</dt>
<dt id="constant.idna-error-empty-label">
<span class="term">
<strong><code>IDNA_ERROR_EMPTY_LABEL</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_LABEL_TOO_LONG</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_DOMAIN_NAME_TOO_LONG</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_LEADING_HYPHEN</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_TRAILING_HYPHEN</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_HYPHEN_3_4</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_LEADING_COMBINING_MARK</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_DISALLOWED</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_PUNYCODE</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_LABEL_HAS_DOT</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_INVALID_ACE_LABEL</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_BIDI</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<br /><span class="term">
<strong><code>IDNA_ERROR_CONTEXTJ</code></strong> (<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
Errors reported in a bitset returned by the UTS #46 algorithm in
<span class="function"><a href="function.idn-to-utf8.html" class="function">idn_to_utf8()</a></span> and
<span class="function"><a href="function.idn-to-ascii.html" class="function">idn_to_ascii()</a></span>.
</span>
</dd>
</dt>
</dl>
</p>
</div>
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