Is_integer()

Introduction

The is_integer() function is a deprecated alias of the is_int() function in PHP. It checks whether a variable is an integer or not. An integer is a data type that represents a whole number.

Syntax

The syntax of the is_integer() function is as follows:

bool is_integer(mixed $var)

The function takes a single parameter, $var, which is the variable to be checked for being an integer. The function returns true if the variable is an integer, and false otherwise.

Example Usage

Here is an example of how to use the is_integer() function in PHP:

<?php
$var1 = 42;
$var2 = "hello";
echo is_integer($var1) . "\n";  // output: 1 (true)
echo is_integer($var2) . "\n";  // output: (false)
?>

In this example, we define two variables: $var1 is an integer with the value of 42, and $var2 is a string. We then use the is_integer() function to check whether each variable is an integer. The output shows that $var1 is an integer (true), while $var2 is not an integer (false).

Conclusion

The is_integer() function is a deprecated alias of the is_int() function in PHP, and is no longer recommended for use. Instead, developers should use the is_int() function to check whether a variable is an integer or not. By using the correct function, developers can ensure that their code is working with the correct data types and avoid errors that may occur when working with mixed data types.