Hello World, In this article, we will discuss 9 Useful Php Array Functions. I will discuss some functions in some detail and with an example. Following are some steps are given below to run the array function.

print_r()

This function is used to print an array with its key and value. this function read like key automatically  0=>ram 1=>sham etc. but we can define our custom key like ram=>age ram=>DOB etc. In this, ram is key and age and DOB is its value.

<?php
$a= ['ram','sham','geeta'];
print_r ($a);
?>
//Output:
//Array ( [0] => ram [1] => sham [2] => geeta )

explode()

This function is used to convert a string into an array. we can use value and variable names to explode the string.

<?php
$a= "it is string";
print_r (explode(" ",$a));
?>
//Output: Array ( [0] => it [1] => is [2] => string )

implode()

This function is used to convert the array into a string. we can use value and variable name to implode the array.

<?php
$a= ['ram','is','a','good','boy.'];
print_r (implode(" ",$a));
?>
//Output:  ram is a good boy

sort()

This function is sort array in ascending order by its value.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
sort($name);
print_r ($name);
'</pre>';
?>
Output: 
 Array
(
    [0] => geeta
    [1] => ram
    [2] => sham
    [3] => sita
)

asort()

This function is to sort the array’s value in ascending order. In this function, the key is set according to the array’s value.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
asort($name);
print_r ($name);
'</pre>';
?>
Output: 
Array
(
    [2] => geeta
    [0] => ram
    [1] => sham
    [3] => sita
)

ksort()

This function is a short array’s key in ascending order. In this function, the value is set according to the array’s key.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
asort($name);
print_r ($name);
'</pre>';
?>
Output: 
Array
(
    [0] => ram
    [1] => sham
    [2] => geeta
    [3] => sita
)

rsort()

This function is sort array in descending order.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
sort($name);
print_r ($name);
'</pre>';
?>
Output: 
Array
(
    [0] => sita
    [1] => sham
    [2] => ram
    [3] => geeta
)

arsort()

This function is a short array’s value in descending order. In this function, the key is set according to the array’s value.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
asort($name);
print_r ($name);
'</pre>';
?>
Output: 
Array
(
    [3] => sita
    [1] => sham
    [0] => ram
    [2] => geeta
)

krsort()

This function is a short array’s key in descending order. In this function, the value is set according to the array’s key.

<?php
$name=['ram','sham','geeta','sita'];
echo '<pre>';
asort($name);
print_r ($name);
'</pre>';
?>
Output: 
Array
(
    [3] => sita
    [2] => geeta
    [1] => sham
    [0] => ram
)