Array Function in PHP

PHP provides various array functions to access and manipulate the elements of array. The important PHP array functions are given below.

1) PHP array() function

PHP array() function creates and returns an array. It allows you to create indexed, associative and multidimensional arrays.

Syntax


array array ([ mixed $... ] )

PHP Example


<?php    
$season=array("summer","winter","spring","autumn");    
echo "Season are: $season[0], $season[1], $season[2] and $season[3]";    
?>

Output

Season are: summer, winter, spring and autumn

2) PHP array_change_key_case() function

PHP array_change_key_case() function changes the case of all key of an array. Note: It changes case of key only.

Syntax


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

PHP Example


<?php    
$salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");    
print_r(array_change_key_case($salary,CASE_UPPER));   
?>

Output

Array ( [SONOO] => 550000 [VIMAL] => 250000 [RATAN] => 200000 )

PHP Example


<?php    
$salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");    
print_r(array_change_key_case($salary,CASE_LOWER));   
?>

Output

Array ( [sonoo] => 550000 [vimal] => 250000 [ratan] => 200000 )

3) PHP array_chunk() function

PHP array_chunk() function splits array into chunks. By using array_chunk() method, you can divide array into many parts.

Syntax


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

PHP Example


<?php    
$salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");    
print_r(array_chunk($salary,2));   
?>

Output

Array ( [0] => Array ( [0] => 550000 [1] => 250000 ) [1] => Array ( [0] => 200000 ) )

4) PHP count() function

PHP count() function counts all elements in an array.

Syntax


int count ( mixed $array_or_countable [, int $mode = COUNT_NORMAL ] )

PHP Example


<?php    
$season=array("summer","winter","spring","autumn");    
echo count($season);    
?>

Output

4

5) PHP sort() function


PHP sort() function sorts all the elements in an array.

Syntax


bool sort ( array &$array [, int $sort_flags = SORT_REGULAR ] )

PHP Example


<?php    
$season=array("summer","winter","spring","autumn");    
sort($season);  
foreach( $season as $s )    
{    
echo "$s<br/>";    
}    
?>

Output

autumn spring summer winter

6) PHP array_reverse() function

PHP array_reverse() function returns an array containing elements in reversed order.

Syntax


array array_reverse ( array $array [, bool $preserve_keys = false ] )

PHP Example


<?php    
$season=array("summer","winter","spring","autumn");    
$reverseseason=array_reverse($season);  
foreach( $reverseseason as $s )    
{    
echo "$s<br/>";    
}    
?>

Output

autumn spring winter summer

7) PHP array_search() function

PHP array_search() function searches the specified value in an array. It returns key if search is successful.

Syntax


mixed array_search ( mixed $needle , array $haystack [, bool $strict = false ] )

PHP Example


<?php    
$season=array("summer","winter","spring","autumn");    
$key=array_search("spring",$season);  
echo $key;    
?>

Output

2

8) PHP array_intersect() function

PHP array_intersect() function returns the intersection of two array. In other words, it returns the matching elements of two array.

Syntax


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

PHP Example


<?php    
$name1=array("sonoo","john","vivek","smith");    
$name2=array("umesh","sonoo","kartik","smith");    
$name3=array_intersect($name1,$name2);  
foreach( $name3 as $n )    
{    
 echo "$n<br/>";    
}    
?>

Output

sonoo smith