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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are always available as part of the PHP core.
</p>
<p class="para">
<dl>
<dt id="constant.case-lower">
<span class="term">
<strong><code>CASE_LOWER</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>CASE_LOWER</code></strong> is used with
<span class="function"><a href="function.array-change-key-case.html" class="function">array_change_key_case()</a></span> and is used to convert array
keys to lower case. This is also the default case for
<span class="function"><a href="function.array-change-key-case.html" class="function">array_change_key_case()</a></span>.
</span>
</dd>
</dt>
<dt id="constant.case-upper">
<span class="term">
<strong><code>CASE_UPPER</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>CASE_UPPER</code></strong> is used with
<span class="function"><a href="function.array-change-key-case.html" class="function">array_change_key_case()</a></span> and is used to convert array
keys to upper case.
</span>
</dd>
</dt>
</dl>
</p>
<p class="para"> Sorting order flags:
<dl>
<dt id="constant.sort-asc">
<span class="term">
<strong><code>SORT_ASC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_ASC</code></strong> is used with
<span class="function"><a href="function.array-multisort.html" class="function">array_multisort()</a></span> to sort in ascending order.
</span>
</dd>
</dt>
<dt id="constant.sort-desc">
<span class="term">
<strong><code>SORT_DESC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_DESC</code></strong> is used with
<span class="function"><a href="function.array-multisort.html" class="function">array_multisort()</a></span> to sort in descending order.
</span>
</dd>
</dt>
</dl>
</p>
<p class="para"> Sorting type flags: used by various sort functions
<dl>
<dt id="constant.sort-regular">
<span class="term">
<strong><code>SORT_REGULAR</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_REGULAR</code></strong> is used to compare items normally.
</span>
</dd>
</dt>
<dt id="constant.sort-numeric">
<span class="term">
<strong><code>SORT_NUMERIC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_NUMERIC</code></strong> is used to compare items numerically.
</span>
</dd>
</dt>
<dt id="constant.sort-string">
<span class="term">
<strong><code>SORT_STRING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_STRING</code></strong> is used to compare items as strings.
</span>
</dd>
</dt>
<dt id="constant.sort-locale-string">
<span class="term">
<strong><code>SORT_LOCALE_STRING</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_LOCALE_STRING</code></strong> is used to compare items as
strings, based on the current locale. Added in PHP 4.4.0 and 5.0.2.
</span>
</dd>
</dt>
<dt id="constant.sort-natural">
<span class="term">
<strong><code>SORT_NATURAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_NATURAL</code></strong> is used to compare items as
strings using "natural ordering" like <span class="function"><a href="function.natsort.html" class="function">natsort()</a></span>. Added in PHP 5.4.0.
</span>
</dd>
</dt>
<dt id="constant.sort-flag-case">
<span class="term">
<strong><code>SORT_FLAG_CASE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
<strong><code>SORT_FLAG_CASE</code></strong> can be combined
(bitwise OR) with
<strong><code>SORT_STRING</code></strong> or
<strong><code>SORT_NATURAL</code></strong> to sort strings case-insensitively. Added in PHP 5.4.0.
</span>
</dd>
</dt>
</dl>
</p>
<dl>
<dt id="constant.count-normal">
<span class="term">
<strong><code>COUNT_NORMAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.count-recursive">
<span class="term">
<strong><code>COUNT_RECURSIVE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-overwrite">
<span class="term">
<strong><code>EXTR_OVERWRITE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-skip">
<span class="term">
<strong><code>EXTR_SKIP</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-prefix-same">
<span class="term">
<strong><code>EXTR_PREFIX_SAME</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-prefix-all">
<span class="term">
<strong><code>EXTR_PREFIX_ALL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-prefix-invalid">
<span class="term">
<strong><code>EXTR_PREFIX_INVALID</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-prefix-if-exists">
<span class="term">
<strong><code>EXTR_PREFIX_IF_EXISTS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-if-exists">
<span class="term">
<strong><code>EXTR_IF_EXISTS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
<dt id="constant.extr-refs">
<span class="term">
<strong><code>EXTR_REFS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</span>
<dd>
<span class="simpara">
</span>
</dd>
</dt>
</dl>
</div>
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