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range: provide examples of generating decrementing arrays and character ranges using array_reverse and array_map

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@65773 c90b9560-bf6c-de11-be94-00142212c4b1
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jim winstead 2001-12-20 20:23:48 +00:00
parent 5e45f2efe5
commit 6947456d0d
1 changed files with 23 additions and 7 deletions
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30
functions/array.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.138 $ -->
<!-- $Revision: 1.139 $ -->
<reference id="ref.array">
<title>Array Functions</title>
<titleabbrev>Arrays</titleabbrev>
@ -3137,9 +3137,10 @@ Array
<function>range</function> returns an array of elements from
<parameter>low</parameter> to <parameter>high</parameter>,
inclusive. If low > high, the sequence will be from high to low.
<example>
<title><function>range</function> examples</title>
<programlisting role="php">
</para>
<example>
<title><function>range</function> examples</title>
<programlisting role="php">
<![CDATA[
foreach(range(0, 9) as $number) {
echo $number;
@ -3151,15 +3152,30 @@ foreach(range('z', 'a') as $letter) {
echo $letter;
}
]]>
</programlisting>
</example>
</para>
</programlisting>
</example>
<note>
<para>
Prior to version 4.1.0 the <function>range</function> function
only generated incrementing integer arrays. Support for
character sequences and decrementing arrays was added in 4.1.0.
</para>
<example>
<title>Simulating decrementing ranges and character sequences</title>
<programlisting role="php">
<![CDATA[
# array_reverse can be used to flip the order of a range
foreach(array_reverse(range(0,9)) as $number) {
echo $number;
}
# array_map() can be used to turn integers into characters using chr()
foreach(array_map('chr', range(ord('a'),ord('z'))) as $character) {
echo $character;
}
]]>
</programlisting>
</example>
</note>
<para>
See <function>shuffle</function> for another example of its use.