Control Functions of Array (Syntax-Examples)

Today we'll learn about functions of an array
I have describe Following functions which can used with array

array_change_key_case
Syntax :
array array_change_key_case ( array $array [, int $case = CASE_LOWER ] )

Example :

<?php
$input_array = array("FirSt" => 1, "SecOnd" => 4);
print_r(array_change_key_case($input_array, CASE_UPPER));
?>

Output:

Array ( [FIRST] => 1 [SECOND] => 4 )

array_chunk

Syntax :

array array_chunk ( array $array , int $size [, bool $preserve_keys = false ] )

Example :
<?php
$input_array = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2, true));
?>

Output :

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [0] => c
            [1] => d
        )

    [2] => Array
        (
            [0] => e
        )

)
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [2] => c
            [3] => d
        )

    [2] => Array
        (
            [4] => e
        )

)

array_column
Syntax :

array array_column ( array $input , mixed $column_key [, mixed $index_key = null ] )

Example :

<?php
// Array representing a possible record set returned from a database
$records = array(
    array(
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe',
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith',
    ),
    array(
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones',
    ),
    array(
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe',
    )
);

$first_names = array_column($records, 'first_name');
print_r($first_names);
?>

Output :
Array
(
    [0] => John
    [1] => Sally
    [2] => Jane
    [3] => Peter
)

array_combine

Syntax :
array array_combine ( array $keys , array $values )

Example :

<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);

print_r($c);
?>

Output :

Array
(
    [green] => avocado
    [red]    => apple
    [yellow] => banana
)

array_count_values

Syntax :
array array_count_values ( array $array )

Example :

<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

Output :Array
(
    [1] => 2
    [hello] => 2
    [world] => 1
)

array_diff_assoc

Syntax :array array_diff_assoc ( array $array1 , array $array2 [, array $... ] )

Example :

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>

Output :
Array
(
      [b] => brown
      [c] => blue
      [0] => red
)

array_diff_key

Syntax :

array array_diff_key ( array $array1 , array $array2 [, array $... ] )

Example :

<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);

var_dump(array_diff_key($array1, $array2));
?>

Output :
array(2) {
["red"]=>
int(2)
["purple"]=>
int(4)
}

array_diff_uassoc

Syntax :
array array_diff_uassoc ( array $array1 , array $array2 [, array $... ], callable $key_compare_func )

Example :

<?php
function key_compare_func($a, $b)
{
    if ($a === $b) {
        return 0;
    }
    return ($a > $b)? 1:-1;
}

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_uassoc($array1, $array2, "key_compare_func");
print_r($result);
?>

Output :
Array
(
     [b] => brown
     [c] => blue
     [0] => red
)

array_diff_ukey

Syntax :
array array_diff_ukey ( array $array1 , array $array2 [, array $... ], callable $key_compare_func )

Example :

<?php
function key_compare_func($key1, $key2)
{
    if ($key1 == $key2)
        return 0;
    else if ($key1 > $key2)
        return 1;
    else
        return -1;
}

$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'   => 8);

var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
?>

Output :
array(2)
{
["red"]=>
int(2)
["purple"]=>
int(4)
}

array_diff

Syntax :
array array_diff ( array $array1 , array $array2 [, array $... ] )

Example :

<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

Output :
Array
(
[1] => blue
)

array fill()

Syntax :

array_fill(index,number,value);

Example :

<?php
$a1=array_fill(3,4,"blue");
$b1=array_fill(0,1,"red");
print_r($a1);
echo "<br>";
print_r($b1);
?>

Output :

Array ( [3] => blue [4] => blue [5] => blue [6] => blue )
Array ( [0] => red )

array_fill_keys()

Syntax :

array_fill_keys(keys,value);

Example :

<?php
$keys=array("a","b","c","d");
$a1=array_fill_keys($keys,"blue");
print_r($a1);
?>

Output :
Array ( [a] => blue [b] => blue [c] => blue [d] => blue )

array_filter() :

Syntax :

array_filter(array,callbackfunction);

Example :

<?php
function test_odd($var)
{
return($var & 1);
}

$a1=array("a","b",2,3,4);
print_r(array_filter($a1,"test_odd"));
?>

Output :
Array ( [3] => 3 )

array_flip() :

Syntax :

array_flip(array);

Example :<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$result=array_flip($a1);
print_r($result);
?>

Output :

Array ( [red] => a [green] => b [blue] => c [yellow] => d )

array_intersect()

Syntax :

array_intersect(array1,array2,array3...);

Example :

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");

$result=array_intersect($a1,$a2);
print_r($result);
?>

Output :

Array ( [a] => red [b] => green [c] => blue )

array_intersect_assoc()

Syntax :

array_intersect_assoc(array1,array2,array3...)

Example :<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");

$result=array_intersect_assoc($a1,$a2);
print_r($result);
?>

Output:

Array ( [a] => red [b] => green [c] => blue )

array_intersect_key()

Syntax :

array_intersect_key(array1,array2,array3...)

Example :<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","c"=>"blue","d"=>"pink");

$result=array_intersect_key($a1,$a2);
print_r($result);
?>

Output :Array ( [a] => red [c] => blue )

array_intersect_uassoc()

Syntax :

array_intersect_uassoc(array1,array2,array3...,myfunction)

Example :
<?php
function myfunction($a,$b)
{
if ($a===$b)
   {
   return 0;
   }
   return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("d"=>"red","b"=>"green","e"=>"blue");

$result=array_intersect_uassoc($a1,$a2,"myfunction");
print_r($result);
?>

Output :Array ( [b] => green )

array_intersect_ukey()

Syntax :

array_intersect_ukey(array1,array2,array3...,myfunction)

Example :<?php
function myfunction($a,$b)
{
if ($a===$b)
   {
   return 0;
   }
   return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"blue","b"=>"black","e"=>"blue");

$result=array_intersect_ukey($a1,$a2,"myfunction");
print_r($result);
?>

Output :Array ( [a] => red [b] => green )

array_key_exists()

Synatax :

array_key_exists(key,array)

Example :<?php
$a=array("Volvo"=>"XC90","BMW"=>"X5");
if (array_key_exists("Volvo",$a))
   {
   echo "Key exists!";
   }
else
   {
   echo "Key does not exist!";
   }
?>

Output :Key exists!

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Control Functions of Array (Syntax-Examples)

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