PHP/Data Structure/asort
Содержание
- 1 After using asort()to return the array"s elements to their original order
- 2 asort() Constants
- 3 asort() function: array indexes maintain their original association with the elements.
- 4 asort( ) function sorts array by its values while preserving the keys
- 5 asort() function works in the same way as sort() and preserves the array"s original key/value associations.
- 6 Sorting with asort()
After using asort()to return the array"s elements to their original order
<?php
$nums = array(15, 2.2, -4, 2.3, 0);
asort($nums);
printf("<pre>%s</pre>\n", var_export($nums, TRUE));
ksort($nums);
printf("<pre>%s</pre>\n", var_export($nums, TRUE));
?>
asort() Constants
SORT_REGULAR Compare the items normally (default).
SORT_NUMERIC Compare the items as numeric values.
SORT_STRING Compare the items as string values.
<HTML>
<HEAD><TITLE>Sorting Arrays</TITLE></HEAD>
<BODY>
<CENTER>
<H2>Sorting Arrays using the <code>asort()</code> function</H2>
<?php
$petshack["name"] = array("A", "B", "C", "D", "E");
$petshack["owner"] = array("J", "A", "C", "A", "H");
$petshack["weight"] = array(20, 10, 3, 54, 30);
$petshack["animal"] = array("Dog", "Cat", "Cat", "Dog", "Dog");
asort($petshack["weight"], SORT_NUMERIC);
?>
<TABLE>
<TR>
<TD>Pet Name</TD>
<TD>Pet Owner</TD>
<TD>Pet Weight</TD>
<TD>Type of Animal</TD>
</TR>
<?php
foreach($petshack["weight"] as $key=>$weight) {
echo "<TR>";
echo "<TD>{$petshack["name"][$key]}</TD><TD>{$petshack["owner"][$key]} </TD>";
echo "<TD>{$weight}</TD><TD>{$petshack["animal"][$key]}</TD>";
echo "</TR>";
}
?>
</TABLE>
</CENTER>
</BODY>
</HTML>
asort() function: array indexes maintain their original association with the elements.
The function"s syntax is: void asort (array array)
<?
$cities = array ("A", "N", "R", "V", "A");
asort($cities);
// for (reset ($cities); $key = key ($cities); next ($cities)) :
// print "cities[$key] = $cities[$key] <br>";
// endfor;
print_r($cities);
?>
asort( ) function sorts array by its values while preserving the keys
//bool arsort ( array &arr [, int options] )
<?
$capitalcities["England"] = "London";
$capitalcities["Wales"] = "Cardiff";
$capitalcities["Scotland"] = "Edinburgh";
asort($capitalcities);
// sorted by value, so Cardiff, Edinburgh, London
?>
asort() function works in the same way as sort() and preserves the array"s original key/value associations.
<?php
$dogs = array("A" => "C", "B" => "D","X" => "Z", "Q" => "T");
asort($dogs);
printf("<pre>%s</pre>\n", var_export($dogs, TRUE));
?>
Sorting with asort()
<?
$meal = array("breakfast" => "A",
"lunch" => "B",
"snack" => "C",
"dinner" => "D");
print "Before Sorting:\n";
foreach ($meal as $key => $value) {
print " \$meal: $key $value\n";
}
asort($meal);
print "After Sorting:\n";
foreach ($meal as $key => $value) {
print " \$meal: $key $value\n";
}
?>