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usort closure example (patch by Benjamin Kuz)
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@325271 c90b9560-bf6c-de11-be94-00142212c4b1
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@ -207,6 +207,41 @@ foreach ($a as $item) {
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b
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c
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d
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]]>
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</screen>
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</example>
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<example>
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<title>
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<function>usort</function> example using a <link linkend="functions.anonymous">closure</link>
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to sort a multi-dimensional array
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$array[0] = array('key_a' => 'z', 'key_b' => 'c');
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$array[1] = array('key_a' => 'x', 'key_b' => 'b');
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$array[2] = array('key_a' => 'y', 'key_b' => 'a');
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function build_sorter($key) {
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return function ($a, $b) use ($key) {
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return strnatcmp($a[$key], $b[$key]);
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};
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}
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usort($array, build_sorter('key_b'));
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foreach ($array as $item) {
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echo $item['key_a'] . ', ' . $item['key_b'] . "\n";
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}
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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y, a
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x, b
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z, c
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]]>
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</screen>
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</example>
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