PHP array_is_list() Function

Last Updated : 22 Jul, 2022

The array_is_list() function is an inbuilt function in PHP that is used to check whether a given array is a list or not. If the given array will be a list if the key of the array contains consecutive numbers from 0 to count($arr)-1.

Syntax:

bool array_is_list(array $array)

Parameters: This function accepts one parameter $array that will check for the list.

Return Value: This function returns true if the given array is a list and false otherwise.

Note: This function returns true on an empty array.

Example 1:

PHP

<?php 
  
$arr1 = array("10", "20", "30", "40", "50"); 
  
var_dump(array_is_list($arr1)); 
  
$arr2 = array( 
    'Geeks'  => "HTML",  
    'GFG'  => "CSS",  
    'Geek'  => "JavaScript",  
    'G4G' => "PHP"
); 
  
var_dump(array_is_list($arr2)); 
  
?>

Output:

bool(true)
bool(false)

Example 2:

PHP

<?php 
  
var_dump(array_is_list([])); 
  
var_dump(array_is_list(array( 
    "10" => "Geeks",  
    "20" => "GeeksforGeeks", 
    "30",  
    "40",  
    "50"
))); 
  
var_dump(array_is_list( 
    array(5, 10, 15, 20, 25) 
)); 
  
?>