php array has value

1$myArr = [38, 18, 10, 7, "15"];
2
3echo in_array(10, $myArr); // TRUE
4echo in_array(19, $myArr); // TRUE
5
6// Without strict check
7echo in_array("18", $myArr); // TRUE
8// With strict check
9echo in_array("18", $myArr, true); // FALSE

1<?php
2$os = array("Apple", "Banana", "Lemon");
3if (in_array("Apple", $os)) {
4    echo "Yeah. Exist Apple";
5}
6if (!in_array("Buleberry", $os)) {
7    echo "Oh, Don't Exist Blueberry!!!";
8}
9?>

1$colors = array("red", "blue", "green"); 
2 
3if (in_array("red", $colors)) { 
4	echo "found red in array"; 
5} 

1<?php
2$os = array("Mac", "NT", "Irix", "Linux");
3if (in_array("Irix", $os)) {
4    echo "Existe Irix";
5}
6if (in_array("mac", $os)) {
7    echo "Existe mac";
8}
9?>

1if (!empty($data_days) && in_array(1, $data_days, true)){ // use numeric value 1, not string

1in_array ( mixed $needle , array $haystack , bool $strict = false ) : bool