PHP in_array() strange results for different types

in_array.php

<?php

// PHP 7.2.10

$value = "test";
var_dump(
    $value,
    in_array($value, [1]),
    in_array($value, [true]),
    in_array($value, ['true']),
    in_array($value, [1, true, 'true']),
    in_array($value, [0, false, 'false']),
    in_array($value, ['test'])
);

/* Output:
 string(4) "test"
 bool(false)
 bool(true)
 bool(false)
 bool(true)
 bool(true)
 bool(true)
 */

/* Expected Output:
 string(4) "test"
 bool(false)
 bool(false)
 bool(false)
 bool(false)
 bool(false)
 bool(true)
 */

var_dump(in_array(null, [0, "0", false, 'false']));

// Output: bool(true)
// Expected Output: bool(false)


// ### Solution: set 3rd parameter to "true" - strict checking. Funny, isn't it? NOOOOOOOHOOOOO! ###