doc-en/reference/array/constants.xml

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<appendix xml:id="array.constants" xmlns="http://docbook.org/ns/docbook">
 &reftitle.constants;
 &extension.constants.core;
 <para>
 <variablelist>
  <varlistentry xml:id="constant.case-lower">
   <term>
    <constant>CASE_LOWER</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>CASE_LOWER</constant> is used with
     <function>array_change_key_case</function> and is used to convert array
     keys to lower case. This is also the default case for
     <function>array_change_key_case</function>. As of PHP 8.2.0, only ASCII
     characters will be converted.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.case-upper">
   <term>
    <constant>CASE_UPPER</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>CASE_UPPER</constant> is used with
     <function>array_change_key_case</function> and is used to convert array
     keys to upper case. As of PHP 8.2.0, only ASCII characters will be
     converted.
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
 </para>

 <para> Sorting order flags:
 <variablelist>
  <varlistentry xml:id="constant.sort-asc">
   <term>
    <constant>SORT_ASC</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>SORT_ASC</constant> is used with
     <function>array_multisort</function> to sort in ascending order.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-desc">
   <term>
    <constant>SORT_DESC</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>SORT_DESC</constant> is used with
     <function>array_multisort</function> to sort in descending order.
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
 </para>

 <para> Sorting type flags: used by various sort functions
 <variablelist>
  <varlistentry xml:id="constant.sort-regular">
   <term>
    <constant>SORT_REGULAR</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>SORT_REGULAR</constant> is used to compare items normally.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-numeric">
   <term>
    <constant>SORT_NUMERIC</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>SORT_NUMERIC</constant> is used to compare items numerically.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-string">
   <term>
    <constant>SORT_STRING</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
    <constant>SORT_STRING</constant> is used to compare items as strings.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-locale-string">
   <term>
    <constant>SORT_LOCALE_STRING</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
    <constant>SORT_LOCALE_STRING</constant> is used to compare items as
    strings, based on the current locale.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-natural">
   <term>
    <constant>SORT_NATURAL</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
    <constant>SORT_NATURAL</constant> is used to compare items as
    strings using "natural ordering" like <function>natsort</function>.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.sort-flag-case">
   <term>
    <constant>SORT_FLAG_CASE</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>SORT_FLAG_CASE</constant> can be combined (bitwise OR) with
     <constant>SORT_STRING</constant> or <constant>SORT_NATURAL</constant> to
     sort strings case-insensitively. As of PHP 8.2.0, only ASCII case folding
     will be done.
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
 </para>

 <para> Filter flags:
 <variablelist>
  <varlistentry xml:id="constant.array-filter-use-key">
   <term>
    <constant>ARRAY_FILTER_USE_KEY</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>ARRAY_FILTER_USE_KEY</constant> is used with
     <function>array_filter</function> to pass each key as the first argument to the given callback function.
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.array-filter-use-both">
   <term>
    <constant>ARRAY_FILTER_USE_BOTH</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>
     <constant>ARRAY_FILTER_USE_BOTH</constant> is used with
     <function>array_filter</function> to pass both value and key to the given callback function.
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
 </para>

 <variablelist>
  <varlistentry xml:id="constant.count-normal">
   <term>
    <constant>COUNT_NORMAL</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.count-recursive">
   <term>
    <constant>COUNT_RECURSIVE</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-overwrite">
   <term>
    <constant>EXTR_OVERWRITE</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-skip">
   <term>
    <constant>EXTR_SKIP</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-prefix-same">
   <term>
    <constant>EXTR_PREFIX_SAME</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-prefix-all">
   <term>
    <constant>EXTR_PREFIX_ALL</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-prefix-invalid">
   <term>
    <constant>EXTR_PREFIX_INVALID</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-prefix-if-exists">
   <term>
    <constant>EXTR_PREFIX_IF_EXISTS</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-if-exists">
   <term>
    <constant>EXTR_IF_EXISTS</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry xml:id="constant.extr-refs">
   <term>
    <constant>EXTR_REFS</constant>
    (<type>int</type>)
   </term>
   <listitem>
    <simpara>

    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
</appendix>
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