PHP is_integer() Function

The is_integer() function is an inbuilt function in PHP that is used to check whether the type of a variable is an integer or not. This function is an alias of is_int() function.

Syntax:

bool is_integer(mixed $value)

Parameters: This function accepts a single parameter $value that holds the value which needs to check for integer.

Return Value: This function returns true if the value is an integer, and false otherwise.

Example 1:

PHP

<?php

$arr = array(5, 10.5, null, true, "GFG");

foreach ($arr as $val) {
    var_dump(is_integer($val));
}

?>

Output:

bool(true)
bool(false)
bool(false)
bool(false)
bool(false)

Example 2:

PHP

<?php

$arr = array(
    15,
    10 => "Geeks",
    30.25,
    "GeeksforGeeks",
    '',
    true,
    50
);

foreach ($arr as $val) {
    var_dump(is_integer($val));
}

?>

Output:

bool(true)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(true)

Reference: https://www.php.net/manual/en/function.is-integer.php