Introduction
In this article I describe the PHP array functions array_diff_ukey, array_fill and array_filter. To learn some other math functions, go to:
- Array Functions in PHP: PART 1
- Array Functions in PHP: PART 2
- Array Functions in PHP: PART 3
PHP array_diff_ukey Function
The array_diff_ukey function compares the keys in two or more arrays, checking for differences, before comparing the keys in a user-defined function, then returns an array containing all the entries from array1 that are not present in any of the other arrays.
Syntax
| array_diff_ukey(array1,array2,array3...........userDefined function) |
Parameters in the array_diff_ukey Function
| Parameter |
Description |
| array1 |
It specifies the array that is compared to the others. |
| array2 |
It specifies an array to compare against. |
| .................. |
It specifies more arrays to compare against. |
| userDefined function |
It specifies the name of the user-defined function. |
Example of array_diff_ukey Function
<?php
functionmyfunction($array1,$array2)
{
if ($array1===$array2)
{
return 0;
}
if ($array1>$array2)
{
return 1;
}
else
{
return -1;
}
}
$array1 = array("a" => "Apple", "b" => "Mango", "c" => "Orange", "Banana");
$array2 = array("a" => "Apple", "b"=>"Raspberry", "banana");
echo "<pre>";
$result = array_diff_ukey($array1, $array2, "myfunction");
print_r($result);
?>
Output
![array-diff-ukey-function-in-php.jpg]()
PHP array_fill Function
The array_fill function is used to fill an array with values and returns the filled array.
Syntax
| array_fill(start, number, array) |
Parameter in array_fill Function
| Parameter |
Description |
| start |
It specifies the starting index of the key. |
| number |
It specifies the number of elements to insert but must be greater than one. |
| array |
It specifies the value to be inserted. |
Example of array_fill Function
<?php
echo "<pre>";
$a = array_fill(1, 2, 'banana');
print_r($a);
echo "<pre>";
$a = array_fill(1, 3, 'Apple');
print_r($a);
?>
Output
![array-fill-function-in-php.jpg]()
PHP array_filter Function
The array_filter function is used to filter the elements of an array using a callback function and returns the filtered array.
Syntax
| array_filter(array, function) |
Parameter in array_filter Function
| Parameter |
Description |
| start |
It specifies an array. |
| number |
It specifies the name of the user-defined function. |
Example of array_filter Function
<?php
function myfunction($array1)
{
if ($array1==="Mango")
{
return true;
}
else
{
return false;
}
}
$array1 = array("a" => "Apple", "b" => "Mango", "c" => "Orange", "Banana");
echo "<pre>";
$result = array_filter($array1,"myfunction");
print_r($result);
?>
Output
![array-filter-function-in-php.jpg]()