We can safely use loose comparison ==, and empty string '' value will also be treated as not present, which is reasonable in this scenario.$nickname = $nickname == null ? 'Anonymous' : $nickname;Now, what about checking arrays or models for being empty?
empty, ";} else {echo " False "; } $my_var=0.0; if(empty($my_var)){echo " True Variable is empty, ";} else {echo " False "; } $my_var=Null; if(empty($my_var)){echo " True Variable is empty, ";} else {echo " False "; } $my_var=False; if(empty($my_var)){ech...
0是数字,是empty,是false,不是null,值相当于空字符串,但类型不是字符串,去空格或强制转换为字符串型时不等于空字符串 ""的值相当于0,是empty,是空字符串,是false,不是null,不是数字字符串 null的值相当于空字符串,值相当于0,是empty,是false,不是字符串,不是数字0 "=="只要值相等就满足条件; "==="...
}//output:0 就是false //=== 判断 '' 和 0 以及 empty null false的关系 end ===// echo "在判断空('')的时候一定要小心,0 也相当于'' ,0 和 '' 都相当于空字符和false,判断为空最好用==="; ?> 输出的结果是: 0 等于 ”” is empty 0 is numeric ” 等于 0 ” 就是false 0 就是...
// $arr[0];V2=FETCH_DIM_R$arrint(0)FREEV2// $arr[0] = $val;ASSIGN_DIM$arrint(0)OP_DATA$val// $arr[0] += 1;ASSIGN_ADD(dim)$arrint(0)OP_DATAint(1)// isset($arr[0]);T5=ISSET_ISEMPTY_DIM_OBJ(isset)$arrint(0)FREET5// unset($arr[0]);UNSET_DIM$arrint(0) ...
/*** 获取和设置配置参数 支持批量定义* @param string|array $name 配置变量* @param mixed $value 配置值* @param mixed $default 默认值* @return mixed*/function C($name = null, $value = null, $default = null){static $_config = array();// 无参数时获取所有if (empty($name)) {return...
V5.1.23+版本开始,支持findOrEmpty方法,当查询不存在的时候返回空数组而不是Null。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // table方法必须指定完整的数据表名 Db::table('think_user')->where('id',1)->findOrEmpty(); 如果没有查找到数据,则会抛出一个think\db\exception\DataNotFoundExce...
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() ...
PHP 中判断变量类型及是否为空主要涉及到的函数有gettype(),isEmpty(),isset(),is_null(),下表详细说
These middleware will automatically trim all incoming string fields on the request, as well as convert any empty string fields to null. This allows you to not have to worry about these normalization concerns in your routes and controllers.