empty variable

empty-checks if a variable is empty Report a bug description BOOL Empty (mixed $var) If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any

empty-checks if a variable is empty Report a bug description BOOL Empty (mixed $var) If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any

empty-Check if a variable is empty Statement a bug description BOOL Empty (mixed $var) Empty () returns FALSE if Var is a non-null or Non-zero value. In other words, "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any

Solution Objective: determine if a variable is empty This article has compiled some commonly used in PHP, the judgment variable is empty method, shares to everybody.1,isset function : Determine whether the variable is initializedDescription:

Empty-check whether a variable is empty Report a bug description Bool empty (mixed $ var)If var is a non-null or non-zero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, array (), var $ var; and objects without any

Phpempty () checks whether a variable is empty. Empty-check whether a variable is null Reportabug description boolempty (mixed $ var) if var is not null or a non-zero value, empty () returns FALSE. In other words, 0, 0, Empty-check whether a

Can empty () replace isset () When php checks whether a variable is set ?. Let's first review empty and issetempty to check whether a variable is empty, 0, 0, NULL, FALSE, array (), var $ var; and objects without any attributes will be considered

Gettype: Get the type of the variable.Intval: convert a variable to an integer.Doubleval: convert a variable to a Double Floating Point.Empty: determines whether the variable is configured.Is_array: determines whether the variable type is an array

Empty () only detects variables, and any non-variables will cause parsing errors. In other words, the following statement does not work: empty (addslashes ($ name )) Empty () only detects variables, and any non-variables will cause parsing errors.

Let's go over the empty and isset empty-check if a variable is empty "", 0, "0", NULL, FALSE, Array (), Var $var; and objects that do not have any properties will be considered empty, and if VAR is null, returns TRUE if the isset-detects whether the