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added multi-dimensional array example to the usort function and added quotes around the user-defined function parameters of the usort and uksort function examples

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@29941 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Daniel Beckham 2000-08-09 14:16:35 +00:00
parent 2f45f8f85c
commit 2f40451f32
1 changed files with 50 additions and 9 deletions
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59
functions/array.xml
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@ -2220,12 +2220,15 @@ fruits[3] = orange
<example>
<title><function>Uksort</function> example</title>
<programlisting role="php">
function mycompare ($a, $b) {
function cmp ($a, $b) {
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$a = array (4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");
uksort ($a, mycompare);
uksort ($a, "cmp");
while (list ($key, $value) = each ($a)) {
echo "$key: $value\n";
}
@ -2291,8 +2294,11 @@ function cmp ($a, $b) {
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$a = array (3, 2, 5, 6, 1);
usort ($a, cmp);
usort ($a, "cmp");
while (list ($key, $value) = each ($a)) {
echo "$key: $value\n";
}
@ -2312,14 +2318,49 @@ while (list ($key, $value) = each ($a)) {
4: 1
</programlisting>
</informalexample>
</para>
<note>
<para>
Obviously in this trivial case the <function>rsort</function>
function would be more appropriate.
</para>
</note>
<para>
<example>
<title><function>Usort</function> example using mulit-dimensional array</title>
<programlisting role="php">
function cmp ($a, $b) {
return strcmp($a["fruit"],$b["fruit"]);
}
$fruits[0]["fruit"] = "lemons";
$fruits[1]["fruit"] = "apples";
$fruits[2]["fruit"] = "grapes";
usort($fruits, "cmp");
while (list ($key, $value) = each ($fruits)) {
echo "\$fruits[$key]: " . $value["fruit"] . "\n";
}
</programlisting>
</example>
</para>
<para>
When sorting a multi-dimensional array, $a and $b contain references to the first index of the array.
</para>
<para>
This example would display:
</para>
<para>
<informalexample>
<programlisting>
$fruits[0]: apples
$fruits[1]: grapes
$fruits[2]: lemons
</programlisting>
</informalexample>
</para>
<para>
<note>
<para>
Obviously in this trivial case the <function>rsort</function>
function would be more appropriate.
</para>
</note>
<warning>
<para>
The underlying quicksort function in some C libraries (such as