class a {
	const OPERATOR_ID = 0;
	public function test(){
		echo self::OPERATOR_ID;
		echo static::OPERATOR_ID;
	}
}
class b extends a {
	const OPERATOR_ID = 1;
}
(new b())->test();

$key

foreach

$array = ['key1'=>1234, 'key2'=>2345, 'key3'=>3457];
foreach ($array as $key => $item) {
	
}
echo $key; // key3

echo strtotime("2031-05-28T00:00:00").PHP_EOL;
echo strtotime("2031-05-28 00:00:00").PHP_EOL;
echo strtotime("2031-05-28").PHP_EOL;

1937692800
1937692800
1937692800

$password = "your_password";

9

$start9 = microtime(true);
$hash9 = password_hash($password, PASSWORD_BCRYPT, ['cost' => 9]);
$end9 = microtime(true);
$executionTime9 = $end9 - $start9;

10

$start10 = microtime(true);
$hash10 = password_hash($password, PASSWORD_BCRYPT, ['cost' => 10]);
$end10 = microtime(true);
$executionTime10 = $end10 - $start10;

$speedupFactor = $executionTime10 / $executionTime9;

// Display the hashed passwords, execution times, and speedup factor
echo "Hashed password with cost 9: " . $hash9 . "\n";
echo "Execution time with cost 9: " . $executionTime9 . " seconds\n\n";
echo "Hashed password with cost 10: " . $hash10 . "\n";
echo "Execution time with cost 10: " . $executionTime10 . " seconds\n\n";
echo "Speedup factor (9 vs 10): " . $speedupFactor . " times faster\n";

$start = microtime(true);

sleep(3);
// Your script code here

$end = microtime(true);
$latency = round($end - $start, 2);
echo "Script execution time: " . $latency . " seconds";

round

2

SimpleXMLElement

$test_array = array (
  'bla' => 'blub',
  'foo' => 'bar',
  'another_array' => array (
    'stack' => 'overflow',
  ),
);

$xml = new SimpleXMLElement('<rootTag/>');
to_xml($xml, $test_array);
print $xml->asXML();

function to_xml(SimpleXMLElement $object, array $data)
{   
    foreach ($data as $key => $value) {
        if (is_array($value)) {
            $new_object = $object->addChild($key);
            to_xml($new_object, $value);
        } else {
            // if the key is an integer, it needs text with it to actually work.
            if ($key != 0 && $key == (int) $key) {
                $key = "key_$key";
            }

            $object->addChild($key, $value);
        }   
    }   
}

$array = [1, 2, "name"=>"Three", 4];
print_r($array);

Array
(
    [0] => 1
    [1] => 2
    [name] => Three
    [2] => 4
)

$array = [1, 2, 7=>"Three", 4];
print_r($array);

Array
(
    [0] => 1
    [1] => 2
    [7] => Three
    [8] => 4
)

$array = [1, 2, 7=>"Three", 4=>"forth", 25];
print_r($array);

Array
(
    [0] => 1
    [1] => 2
    [7] => Three
    [4] => forth
    [8] => 25
)

$array = [
	1    => "a",
    "1"  => "b",
    "-1"  => "-b",
    '1.5'  => "c",
    true => "d",
];
print_r($array);

Array
(
    [1] => d
    [-1] => -b
    [1.5] => c
)

parse_ini_file()

ini

session_write_close()

ctype_alnum

IF

$var = 'as2df234asdf';

if (ctype_alnum($var)) {
	echo 'if';
} else {
	echo 'else';
}