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| Functions for array sorting in PHP |
Functions
for array sorting in PHP
In this tutorial you will learn how to sort the elements or
keys of an array in ascending or descending order in PHP.
What is sorting?
Sorting is ordering data in an alphabetical, numerical order and increasing or decreasing order according to some linear relationship between the data items.
Sorting function
for array
- sort() - sort arrays in ascending order
- rsort() - sort arrays in descending order
- asort() - sort associative arrays in ascending order
- ksort() - sort associative arrays in ascending order
- arsort() - sort associative arrays in descending order
- krsort() - sort associative arrays in descending order
sort() and rsort()
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For sorting indexed arrays
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asort() and arsort()
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For sorting associative arrays by value
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ksort() and krsort()
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For sorting associative arrays by key
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Sort Array in Ascending Order – sort()
The sort() function is used for sorting the elements of the indexed array in ascending order.
Example-
In this example sorts the elements of the $info array in ascending alphabetical order:
<!DOCTYPE
html>
<html>
<head>
<title>Sort array in
ascending order - Sort()</title>
</head>
<body>
<?php
$info =
array('Welcome','Cyber','Teak !');
sort($info);
$length =
count($info);
for ($i=0; $i
<$length ; $i++) {
echo
$info[$i]."<br>";
}
?>
</body>
</html>
|
Example –
In this example sorts the elements of the $info array in ascending numerical order:
<!DOCTYPE
html>
<html>
<head>
<title>Sort array in
ascending order - Sort()</title>
</head>
<body>
<?php
$info = array(10,5,3,55,22,11,2,66,23,45);
sort($info);
$length =
count($info);
for ($i=0; $i
<$length ; $i++) {
echo
$info[$i]."<br>";
}
?>
</body>
</html>
|
Output –
Sort Array
in Descending Order - rsort()
The sort() function is used for sorting the elements of the
indexed array in descending order.
Example -
In this example sorts the elements of the $info array in
descending alphabetical order:
<!DOCTYPE
html>
<html>
<head>
<title>Sort array in
descending order - rsort()</title>
</head>
<body>
<?php
$info =
array('Welcome','Cyber','Teak !');
rsort($info);
$length =
count($info);
for ($i=0; $i
<$length ; $i++) {
echo
$info[$i]."<br>";
}
?>
</body>
</html>
|
Output –
Example –
In this example sorts the elements of the $info array in
descending numerical order:
<!DOCTYPE
html>
<html>
<head>
<title>Sort array in
descending order - rsort()</title>
</head>
<body>
<?php
$info =
array(10,5,3,55,22,11,2,66,23,45);
rsort($info);
$length =
count($info);
for ($i=0; $i
<$length ; $i++) {
echo
$info[$i]."<br>";
}
?>
</body>
</html>
|
Output –
Sort
associative array in ascending order, According to value – asort()
The asort() function is used for sorting the elements of the associative
array in ascending order.
Example –
In this example sorts an associative array in ascending
order, according to value:
<!DOCTYPE
html>
<html>
<head>
<title>asort() - ascending
order</title>
</head>
<body>
<?php
$info =
array("Ram"=>50,"Maya"=>33,"Manish"=>43);
asort($info);
//Access array
foreach ($info as $key
=> $value) {
echo
$key." : ".$value."<br>";
}
?>
</body>
</html>
|
Output –
Sort
associative array in ascending order, According to key – ksort()
The ksort() function is used for sorting the elements of the associative
array in ascending order.
Example –
In this example sorts an associative array in ascending
order, according to key:
<!DOCTYPE
html>
<html>
<head>
<title>ksort() - ascending
order</title>
</head>
<body>
<?php
$info =
array("Ram"=>50,"Aditya"=>33,"Manish"=>43);
ksort($info);
//Access array
foreach ($info as $key
=> $value) {
echo
$key." : ".$value."<br>";
}
?>
</body>
</html>
|
Output –
Sort
associative array in descending order, According to value – arsort()
The arsort() function is used for sorting the elements of the associative array in descending order.
Example –
In this example sorts an associative array in descending order, according to value:
<!DOCTYPE
html>
<html>
<head>
<title>arsort() - descending
order via value</title>
</head>
<body>
<?php
$info =
array("Ram"=>200,"Shyam"=>125,"Abhi"=>250);
//Descending order
accourding values
arsort($info);
//Access associative
array
foreach ($info as $key
=> $value) {
echo
$key." : ".$value."<br>";
}
?>
</body>
</html>
|
Output –
Sort
associative array in descending order, According to key – krsort()
The krsort() function is used for sorting the elements of the
associative array in descending order.
Example –
In this example sorts an associative array in descending
order, according to key:
<!DOCTYPE
html>
<html>
<head>
<title>krsort() - descending
order via key</title>
</head>
<body>
<?php
$info =
array("Ram"=>200,"Shyam"=>125,"Abhi"=>250);
//Descending order
accourding key
krsort($info);
//Access associative
array
foreach ($info as $key
=> $value) {
echo
$key." : ".$value."<br>";
}
?>
</body>
</html>
|
Output –
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