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PHP: in_array() function

PHP: Checks if a value exists in an array

The in_array() function is used to check whether a value exists in an array or not.

Note: Searches haystack for needle using loose comparison unless strict is set.

Version:

(PHP 4 and above)

Syntax:

in_array(search_value, array_name, mode)

Parameters:

Name Description Required /
Optional		 Type
search_value Value to search in the array. Required Mixed*
array_name Specifies the array to search. Required Array
mode If it is set to true, the function checks the type of the search_value. Optional Boolean

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

TRUE if search_value is found in array_name, FALSE otherwise.

Value Type : Boolean.

Example:

<?php
$number_list =  array('16.10', '22.0', '33.45', '45.45');
if (in_array(22.0, $number_list))
{
echo "'22.0' found in the array";
}
?>

Output:

'22.0' found in the array

Pictorial Presentation:

php function reference: in_array() function

View the example in the browser

Practice here online :

See also

PHP Function Reference

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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)