SortAssociativeAndIndexArray.php

<?php
//function to sort index array in ascending order
$num=array(2,4,3,8,9);
sort($num);//ascending order

$length=count($num);
for ($i=0;$i<$length;$i++){
	echo $num[$i]."<br>";
}
echo "<br>";

//function to sort index array in descending order
rsort($num);
$len=count($num);
for ($i=0;$i<$len;$i++){
	echo $num[$i]."<br>";
}
echo"<br><br>";


//sorting associative array in ascending order by value
echo "<br>age in ascending order by value is:<br>";
$age=array(
"ram"=>29,"hari"=>34,"sita"=>32
);
asort($age);
foreach($age as $key=>$value){
	echo "name: ".$key." and age: ".$value."<br>";
}
echo "<br>age in descending order by value is:<br>";
//sorting associative array in descending order by value
arsort($age);
foreach ($age as $key=>$value){
	echo "name: ".$key." and age: ".$value."<br>";
}

//arranging associative array in ascending order by key
echo "<br>sorting in ascending order by key is:<br>";
$favfruits=array(
"first"=>["mango","orange","apple"],
"second"=>["banana","grapes","strawberry"],
"third"=>["pineapple","cherry","litchi"]
);
ksort($favfruits);
foreach ($favfruits as $key => $fruits) {
	echo"<strong>$key:</strong><br>";
	foreach ($fruits as $fruit){
		echo "-$fruit<br>";
	}
}
echo "<br>sorting inner array alphabetically in ascending order<br>";
// Sort each inner array alphabetically
foreach ($favfruits as &$fruits) {
    sort($fruits); // sort() arranges values in ascending order
}
unset($fruits); // break reference

// Display the sorted result
foreach ($favfruits as $key => $fruits) {
    echo "<strong>$key:</strong><br>";
    foreach ($fruits as $fruit) {
        echo "- $fruit<br>";
    }
}


echo "<br>sorting in descending order by key is:<br>";
krsort($favfruits);
foreach ($favfruits as $key => $fruits) {
	echo "<strong>$key:</strong><br>";
	foreach ($fruits as $fruit){
		echo "-$fruit<br>";
	}
}


echo "<br>sorting inner array alphabetically in descending order<br>";
foreach ($favfruits as $key => &$fruits) {
	rsort($fruits);
}
unset($fruits);
foreach($favfruits as $key=>$fruits){
	echo "<strong>$key:</strong><br>";
	foreach($fruits as $fruit){
		echo "-$fruit<br>";
	}
}
?>