Following is the code to create a full screen search box with CSS and JavaScript −Example Live Demo body {    font-family: Arial; } * {    box-sizing: border-box; } .showBtn {    background: #008b0c;    border: none;    color:white;    padding: 10px 15px;    font-size: 20px; ... Read More

Following is the code to create a form with icons −Example Live Demo body {    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } * {    box-sizing: border-box; } h1 {    text-align: center; } form {    max-width: 500px;    margin: auto; } .fieldContainer ... Read More

Following is the code to create a contact form using CSS −Example Live Demo * {box-sizing: border-box;} body{    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; } label{    font-size: 15px; } input[type=text], textarea {    width: 100%;    padding: 12px;    border: 1px solid #ccc;   ... Read More

The same syntax used by is_callable and call_user_func can be used to pass static methods as arguments in PHP.To pass the static method, the below example can be used −Example Live Demo OutputThis will produce the following output −bool(true) my_func bool(true)

The Reflection API can be used to pass arguments from array to constructor.ReflectionClass::newInstanceArgsThe above line creates a new class instance from given arguments −public ReflectionClass::newInstanceArgs ([ array $args ] ) : objectIt creates a new instance of the class when the arguments are passed to the constructor. Here, args refers ... Read More

The domain name can be validated using the below code in PHP −Example Live Demo $domain_name = 'https://tutorialspoint.com' is_valid_domain_name($domain_name)OutputThis will produce the following output −$domain_name = 'https://tutorialspoint.com' is_valid_domain_name($domain_name)In the above code, the ‘preg_match’ function is used to match the domain_name passed as an argument to the user-defined function ‘is_valid_domain_name’.Read More

To install Imagick or Imagemagick on windows, follow the below mentioned procedure −Check the permissions on the .dll file. This will make sure that the Apache user has read access to the file.It is better to change the permission of the [PHP]/extension directory.In order to change the permission, follow the ... Read More

The memory_get_usage() function can be caked before and after allocating memory to the class created.class MyBigClass {    var $allocatedSize;    var $allMyOtherStuff; } function AllocateMyBigClass() {    $before = memory_get_usage();    $ret = new MyBigClass;    $after = memory_get_usage();    $ret->allocatedSize = ($after - $before);    return $ret; }Output ... Read More

In PHP version 5.3, methods of objects in array can be called using the below code −$props = array_map(function($obj){ return $obj->getProp(); }, $objs);This will be slower than a ‘for’ loop since it invokes one function for every element −function map($obj) {    return $obj->getProperty(); } $props = array_map('map', $objs);Alternatively, for ... Read More

The short answer is no. POST/GET values are never null. The best they can be is an empty string, which can then be converted to null/'NULL' −Example Live Demoif ($_POST['value'] === '') {    $_POST['value'] = null; } echo'Null assigned';OutputThis will produce the following output −Null assigned