Павел

<input type="submit" value="LOGIN" name="submit" class="reg" onclick="window.location.href = 'https://site.com/link';">

$ageCount = 0;
while ($row = $result->fetch_assoc())
   {
$ageCount  += $row['age'];
var_dump($ageCount);
   }

$s = 0;
foreach ($tables as $key => $value) {
 if () {
  $s = 2;
 } else {
  $s = 1;
 }
}

$(document).ready(function() {    
$("*").find("a[href='"+window.location.href+"']").each(function(){  // Ищем текущую ссылку     
    $(this).addClass("current_link");     // Добавляем текущей ссылке class - current_link
})
});

add_filter('nav_menu_css_class' , 'add_active_class' , 10 , 2);

function add_active_class ($classes, $item) {
    if (in_array('current-menu-item', $classes) ){
        $classes[] = 'current_link';
    }
    return $classes;
}

$minix = 1;
$maxix = 10;
$numbers = mt_rand($minix * 2, $maxix * 2) / 2;

<div class="modal fade" id="YouModal" data-backdrop="static" tabindex="-1" role="dialog" aria-labelledby="YouModalLabel" aria-hidden="true">

$('#YouModal').modal({
  backdrop: 'static',
  keyboard: true
})

$('#YouModal').on('hide.bs.modal', function (e) {
    e.preventDefault();
    e.stopPropagation();
    return false;
});

if ($(".block").length > 0) {

} else if ($(".block2").length > 0) {

}

if (document.getElementsByClassName('block1')){
    alert('Блок есть!');
}