PHP Array Functions

There are various array functions in PHP. They are used to access and manipulate the elements ofan array. Following are functions of array.

Array Function	Description
array()	It is used to create an array.
array_change_key_case()	It is used to convert lowercase or uppercase of all keys in an array.
array_chunk()	It is used to split an array into chunks of arrays.
array_pop()	It is used to delete the last element of an array.
array_merge()	It is used to merge one or more arrays into one array.
array_rand()	It is used to returns one or more random keys from an array.
array_reverse()	It returns an array in the reverse order.
array_search()	It searches an array for a given value and returns the key.
count()	It returns the number of elements in an array.
extract()	It imports variables into the current symbol table from an array.
sort()	PHP sort() function sorts all the elements in an array.

• PHP array() function

PHP array()function is used to create  an array( Associate , Index and Multidimensional). Example:

<!DOCTYPE html>
<html>
<body>
<?php
$week=array("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday");
$arrlength=count($week);
echo "=====To print Week days using an array======"."<br>";
for($x=0;$x<$arrlength;$x++)
  {
echo $week[$x];
echo "<br>";
  }
?>
</body>
</html>

Output =====To print Week days using an array====== Sunday Monday Tuesday Wednesday Thursday Friday Saturday

• array_change_key_case() function

PHP array_change_key_case() function is used to change the case of all key of an array. Example

<!DOCTYPE html>
<html>
<body>
<?php
  $salary=array("Sunday"=>"1","Monday"=>"2","Tuesday"=>"3");
print_r(array_change_key_case($salary,CASE_UPPER));
  ?>
</body>
</html>

Output

Array ( [SUNDAY] => 1 [MONDAY] => 2 [TUESDAY] => 3 )

3). PHP array_chunk() function PHP array_chunk() function is  used to split an array into chunks. We can divide array into many parts. Example

<!DOCTYPE html>
<html>
<body>
<?php
  $salary=array("Sunday"=>"1","Monday"=>"2","Tuesday"=>"3");
print_r(array_chunk($salary,2));
  ?>
</body>
</html>

Output

Array ( [0] => Array ( [0] => 1 [1] => 2 ) [1] => Array ( [0] => 3 ) )

PHP array_pop() Function PHP array_pop() function is used to delete last element of an array. Example

<?php
$a=array("red","green","blue");
array_pop($a);
print_r($a);
?>

PHP count() Function PHP count() function is used to return the number of elements in an array. Example

<!DOCTYPE html>
<html>
<body>
<?php
$color=array("Red","Blue","Green","Magenta");
echo count($color);
?>
</body>
</html>

Output 4 PHP sort() Function PHP short() function is used to sort the elements of  an array in ascending order. Example

<!DOCTYPE html>
<html>
<body>
<?php
$color=array(27,21,83,11);
sort($color);
$clength=count($color);
echo"Assending Order [27,21,83,11]"."<br>";
for($x=0;$x<$clength;$x++){
echo $color[$x];
echo "<br>";
  }
?>
</body>
</html>

Output Assending Order [27,21,83,11] 11 21 27 83