}if(is_string($a)){echo"'' is string;"; }else{echo"'' is not string;"; }if(!$a){echo"'' is false;"; }else{echo"'' is not false;"; }//判断 null 和 ''、0、empty、false 之间的关系$a=null;echo"null 和 ''、0、empty、false 之间的关系:";if($a== ''){echo"null ==...
if(empty($a)){ echo "'' is empty;"; }else{ echo "'' is not empty;"; } if(is_null($a)){ echo "'' is null;"; }else{ echo "'' is not null;"; } if(is_numeric($a)){ echo "'' is numeric;"; }else{ echo "'' is not numeric;"; } if(is_string($a)){ echo "...
}if(Input::notEmpty('username') && Input::notEmpty('pwd') && Input::notEmpty('firstname') && Input::notEmpty('lastname') && Input::notEmpty('email') && Input::notEmpty('zipcode')) {// create new instance of user class$user =newUser(); $user->first_name = $firstName; $user...
}elseif(!isset($key['user_id'])) { $key['user_id'] = User::get('id'); }// to support emails, too// Assert::true(Common::isUuid($key['user_id']));$_this = Common::getModel('AuthKey');if(!Common::isUuid($key['auth_key_type_id']) && !empty($key['auth_key_type_...
public static function detect() {// create a server object from global$server = new Server($_SERVER);$try = array('REQUEST_URI', 'PATH_INFO', 'ORIG_PATH_INFO');foreach($try as $method) {// make sure the server var exists and is not emptyif($server->has($method) and $uri =...
empty() 现在支持表达式了,而不仅仅是变量。 5.4.0 检查非数字的字符串偏移量会返回 true. 范例 示例#1 一个简单的 empty() 与isset() 的比较。 <?php$var = 0;// Evaluates to true because $var is emptyif (empty($var)) { echo '$var is either 0, empty, or not set at all';}// ...
The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0 0.0 "0" "" NULL FALSE array() ...
if (!isset($var)) { echo '$var is not set at all'; } ?> 另: The following things are considered to be empty: "" (an empty string) 0 (0 as an integer) 0.0 (0 as a float) "0" (0 as a string) NULL FALSE array() (an empty array) ...
If set to SCAN_NORETRY (the default), phpredis will just issue one SCAN command at a time, sometimes returning an empty array of results. If set to SCAN_RETRY, phpredis will retry the scan command until keys come back OR Redis returns an iterator of zero */ $redis->setOption(Redis:...
; foo = ; sets foo to an empty string ; foo = None ; sets foo to an empty string ; foo = "None" ; sets foo to the string 'None' ; If you use constants in your value, and these constants belong to a ; dynamically loaded extension (either a PHP extension or a Zend extension)...