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d1df62fe77
These always return true, even in PHP 7 Clarify sorting is unstable prior to PHP 8.0 Normalize the docs between the functions Closes GH-686
169 lines
4.8 KiB
XML
169 lines
4.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter xml:id="array.sorting" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Sorting Arrays</title>
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<para>
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PHP has several functions that deal with sorting arrays, and this
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document exists to help sort it all out.
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</para>
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<para>
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The main differences are:
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</para>
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<para>
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<simplelist>
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<member>
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Some sort based on the <type>array</type> keys, whereas others by
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the values: <literal>$array['key'] = 'value';</literal>
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</member>
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<member>
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Whether or not the correlation between the keys and values are
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maintained after the sort, which may mean the keys are reset
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numerically (0,1,2 ...)
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</member>
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<member>
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The order of the sort: alphabetical, ascending (low to high),
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descending (high to low), natural, random, or user defined
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</member>
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<member>
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Note: All of these sort functions act directly on the array
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variable itself, as opposed to returning a new sorted array
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</member>
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<member>
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If any of these sort functions evaluates two members as equal
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then they retain their original order.
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Prior to PHP 8.0.0, their order were undefined (the sorting was not stable).
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</member>
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</simplelist>
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</para>
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<para>
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<table>
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<title>Sorting function attributes</title>
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<tgroup cols="5">
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<thead>
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<row>
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<entry>Function name</entry>
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<entry>Sorts by</entry>
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<entry>Maintains key association</entry>
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<entry>Order of sort</entry>
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<entry>Related functions</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><function>array_multisort</function></entry>
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<entry>value</entry>
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<entry><type>string</type> keys yes, <type>int</type> keys no</entry>
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<entry>first array or sort options</entry>
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<entry><function>array_walk</function></entry>
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</row>
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<row>
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<entry><function>asort</function></entry>
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<entry>value</entry>
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<entry>yes</entry>
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<entry>ascending</entry>
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<entry><function>arsort</function></entry>
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</row>
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<row>
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<entry><function>arsort</function></entry>
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<entry>value</entry>
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<entry>yes</entry>
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<entry>descending</entry>
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<entry><function>asort</function></entry>
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</row>
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<row>
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<entry><function>krsort</function></entry>
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<entry>key</entry>
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<entry>yes</entry>
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<entry>descending</entry>
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<entry><function>ksort</function></entry>
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</row>
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<row>
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<entry><function>ksort</function></entry>
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<entry>key</entry>
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<entry>yes</entry>
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<entry>ascending</entry>
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<entry><function>krsort</function></entry>
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</row>
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<row>
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<entry><function>natcasesort</function></entry>
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<entry>value</entry>
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<entry>yes</entry>
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<entry>natural, case insensitive</entry>
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<entry><function>natsort</function></entry>
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</row>
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<row>
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<entry><function>natsort</function></entry>
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<entry>value</entry>
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<entry>yes</entry>
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<entry>natural</entry>
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<entry><function>natcasesort</function></entry>
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</row>
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<row>
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<entry><function>rsort</function></entry>
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<entry>value</entry>
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<entry>no</entry>
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<entry>descending</entry>
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<entry><function>sort</function></entry>
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</row>
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<row>
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<entry><function>shuffle</function></entry>
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<entry>value</entry>
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<entry>no</entry>
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<entry>random</entry>
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<entry><function>array_rand</function></entry>
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</row>
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<row>
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<entry><function>sort</function></entry>
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<entry>value</entry>
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<entry>no</entry>
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<entry>ascending</entry>
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<entry><function>rsort</function></entry>
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</row>
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<row>
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<entry><function>uasort</function></entry>
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<entry>value</entry>
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<entry>yes</entry>
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<entry>user defined</entry>
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<entry><function>uksort</function></entry>
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</row>
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<row>
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<entry><function>uksort</function></entry>
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<entry>key</entry>
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<entry>yes</entry>
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<entry>user defined</entry>
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<entry><function>uasort</function></entry>
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</row>
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<row>
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<entry><function>usort</function></entry>
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<entry>value</entry>
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<entry>no</entry>
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<entry>user defined</entry>
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<entry><function>uasort</function></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</chapter>
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vim600: syn=xml fen fdm=syntax fdl=2 si
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