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bool is_int ( mixed $var )

<?php
$var_name1 = 678;
$var_name2 = "a678";
$var_name3 = "678";
$var_name4 = 999;
$var_name5 = 698.99;
$var_name6 = array("a1", "a2");
$var_name7 = +125689.66;
if (is_int($var_name1)) {
    echo "$var_name1 is an integer" . PHP_EOL;
} else {
    echo "$var_name1 is not an integer" . PHP_EOL;
}
if (is_int($var_name2)) {
    echo "$var_name2 is an integer" . PHP_EOL;
} else {
    echo "$var_name2 is not an integer" . PHP_EOL;
}
$result = is_int($var_name3);
echo "[Is $var_name3 an integer?] " . var_dump($result) . PHP_EOL;
$result = is_int($var_name4);
echo "[Is $var_name4 an integer?] " . var_dump($result) . PHP_EOL;
$result = is_int($var_name5);
echo "[Is $var_name5 an integer?] " . var_dump($result) . PHP_EOL;
$result = is_int($var_name6);
echo "[Is $var_name6 an integer?] " . var_dump($result) . PHP_EOL;
$result = is_int($var_name7);
echo "[Is $var_name7 an integer?] " . var_dump($result);
?>

678 is an integer
a678 is not an integer
bool(false)
[Is 678 an integer?]
bool(true)
[Is 999 an integer?]
bool(false)
[Is 698.99 an integer?]
bool(false)
[Is Array an integer?]
bool(false)
[Is 125689.66 an integer?]