Checking if a variable is an integer in PHP

In PHP, you can use the is_int() function to check if a variable is an integer.

Example:

<?php

$x = 5;
if (is_int($x)) {
  echo "x is an integer";
} else {
  echo "x is not an integer";
}

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You can also use is_integer() which is an alias of is_int().

<?php

$x = 5;
if (is_integer($x)) {
  echo "x is an integer";
} else {
  echo "x is not an integer";
}