empty function

var textboxs = new Array (); Input collection of text type var radiolist = new Object (); Radio type of input collection, because radio is special, to a set of tests, so here with a Hashtable, according to radio name as key to save all the Radio

$a = ';Echo ' 1---------------'. Empty ($a). ' ';$a = ' 0 ';Echo ' 2---------------'. Empty ($a). ' ';$a = 0;Echo ' 3---------------'. Empty ($a). ' ';$a = null;Echo ' 4---------------'. Empty ($a). ' ';$a = ' null ';Echo ' 5---------------'.

Determines whether the directory is empty, true is null, false is not empty function Is_empty_dir ($fp) {$H = @ opendir ($fp), $i =0, while ($_file=readdir ($H)) {$i + +;} Closedir ($H); if ($i >2) {return false;} Else{return true;}} 1. Determine if

Determines whether the directory is empty, true is null, false is not empty function Is_empty_dir ($fp) {$H = @ opendir ($fp), $i =0, while ($_file=readdir ($H)) {$i + +;} Closedir ($H); if ($i >2) {return false;} Else{return true;}} 1. Determine if

I read "talking about JS object-oriented programming" a few days ago. At that time, I asked haoshen to findArticleIn some cases, it may be misleading (or different from ECMA). Later I flipped through ECMA and finally found the "standard ......This

Implementation principle: Define a wrapper function extend; the function has 2 parameters, the child represents the subclass, and the parent represents the parents, and within the function, an empty function f is defined to implement the function

Analysis of the 10 most common mistakes in PHP programming 10 Currently learning PHP a lot of friends, in peacetime daily program development project always encounter a variety of problems, this experience will introduce PHP development in the 10

In php, array_filter is used to filter the array to null values. What methods do you think of when we judge that the array is empty during the development process? The first thought should be the empty function, but it is wrong to use the empty

PHP is a very popular open source server-side scripting language, and most of the sites you see on the World Wide Web are developed using PHP. This article will introduce PHP development in the 10 most common problems, I hope to be able to help

Read Catalogue One: Understanding the constructor prototype (prototype) mechanism Second: Understanding the concept of prototype domain chain Three: Understanding the prototype inheritance mechanism IV: Understanding the use of

Error 1:foreach left hanging pointer after loop In a foreach loop, if we need to change the elements of an iteration or to improve efficiency, applying a reference is a good idea: $arr = Array (1, 2, 3, 4);foreach ($arr as & $value) {$value =

 function is a template for a set of functional object wrapper classes, which implements a generic callback mechanism. Functions are similar to function pointers in that they allow the user to have greater flexibility in the implementation of the

Currently learning PHP a lot of friends, in peacetime routine development projects will always encounter a variety of problems, this experience to introduce PHP development in 10 of the most common problems, hope to be able to help friends. Error 1:

This article lists some of the more common mistakes we made in PHP programming, which are listed in 10. Error 1:foreach Loop left hanging pointer In a foreach loop, if we need to change the elements of an iteration or to improve efficiency, it's a

Reply content: Reference PHP Document: empty-Check if a variable is empty it is obvious that obj is not empty ~ test: Print_r ($obj); Game Object () empty or non-empty is defined, you do not guess ah ... Objects have been instantiated, then empty is

I. Function creation process Before learning about the prototype chain, let's take a look at what a function does during creation. Let's take an example of an empty function: 1 function (){}; When we declare such an empty function in the Code, the

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...]]) Function: Detect whether the variable is set return value: Returns FALSE if the variable does not exist Returns FALSE

Difference between PHP isset () and empty (), issetemptyThe isset () function of PHP is generally used to check whether the variable is set.Format: bool isset (mixed var [, mixed var [,...])Function: checks whether variables are set.Return Value:If

PHPisset () and empty () usage differences. The isset () function of PHP is generally used to check whether the variable is set in the format boolisset (mixedvar [, mixedvar [,...]). function: checks whether a return value is set for a variable. if

The 10 most common errors in PHP programming. 10 most common errors in PHP programming this article lists some of the most common errors in php programming. This article lists 10. Error 1: After the foreach loop, the top 10 most common errors in for