echo "null is empty;"; }else{ echo "null is not empty;"; } if(is_numeric($a)){ echo "null is numeric;"; }else{ echo "null is not numeric;"; } if(is_string($a)){ echo "null is string;"; }else{ echo "null is not string;"; } if(!$a){ echo "null is false;"; }...
140141if(is_string($a))142{143echo"'' is string;";144}145else146{147echo"'' is not string;";148}149150if(!$a)151{152echo"'' is false;";153}154else155{156echo"'' is not false;";157}158159//判断 null 和 ''、0、empty、false 之间的关系160$a=null;161echo"null 和 ''、0、e...
if(intval($a) == 0){ echo "intval(null) == 0;"; }else{ echo "intval(null) != 0;"; } if(empty($a)){ echo "null is empty;"; }else{ echo "null is not empty;"; } if(is_numeric($a)){ echo "null is numeric;"; }else{ echo "null is not numeric;"; } if(is_stri...
$l = null; var_dump($obj->name); //output:string(6) "phpgod" var_dump($obj->j); //null var_dump(isset($obj->j));//由于$j没有赋值,为空null,所以返回false //var_dump($obj->properties); var_dump(isset($obj->name));//私有或者保护属性不能被调用,false //output:bool(false)...
为了通过XPath定位获取元素,并处理获取元素为Null时的异常提示,同时保留源页面的代码块、字体样式、段落和图片排版,您可以按照以下步骤进行操作:1. 修改文章采集功能代码在`article-collector.php`文件中的`article_collector_page`函数中,使用XPath定位获取标题和内容元素,并添加异常处理以及保留源页面的样式和排版。以下...
7.empty函数 判断变量是否为空,0 "" "0" false array() null 没有定义 这7种都为空的情况 8.变量类型测试函数 代码语言:javascript 代码运行次数:0 运行 AI代码解释 整型is_int();浮点型is_float();字符型is_string();布尔型is_bool();数组is_array();对象is_object();资源is_resource();null类型...
"s -->"; } else { $content = trim($_POST['content']); if (strlen($content) == 0) { echo ERROR_IS_EMPTY; exit; } $content = (string) filter_var($content, FILTER_SANITIZE_SPECIAL_CHARS); $this->postWhisper($content); } } private function postWhisper($content) { $date = da...
In contrast, the empty function checks if a variable is considered empty, returning true if the variable is empty (i.e., not set, false, 0, an empty string, an empty array, or null). While isset checks for existence and a non-null value, empty specifically focuses on emptiness, ...
function I($name,$default='',$filter=null,$datas=null) {static $_PUT = null;if(strpos($name,'/')){ // 指定修饰符list($name,$type) = explode('/',$name,2);}elseif(C('VAR_AUTO_STRING')){ // 默认强制转换为字符串$type = 's';}if(strpos($name,'.')) { // 指定参数来源...
Description: Get or Set the Redis server configuration parameters. Prototype $redis->config(string $operation, string|array|null $key = NULL, ?string $value = NULL): mixed; Return value Associative array for GET, key(s) -> value(s) bool for SET, RESETSTAT, and REWRITE Examples $redis-...