empty function

PHP empty functions and isset functions are often used, and the frequency is not low, two have similar places, but in fact there is a big difference, it is very important to distinguish between the two strictly. The empty function is used to detect

Precautions for using the empty () function in php. When empty () is used to determine the number 0, empty () returns true, that is, if your variable may contain the number 0, you must use isset () will be better !! When empty () is used to

When empty () is used to determine the number 0, empty () returns true, that is, if your variable may contain the number 0, you must use isset () will be better !! On the surface, it is easy to misunderstand that the empty () function is a function

In website program development, there are many webpage data submission pages. The simplest is the login page, which cannot be blank when the input content is submitted in the text box on the login page. In addition to controlling the text box

This article mainly introduces the description of the PHP empty () function, has a certain reference value, now share to everyone, the need for friends can refer to On the face of it, it is easy to misunderstand that the empty () function is a

On the surface, it is easy to misunderstand that the empty () function is a function used to judge whether the string is null. In fact, it is not, so I suffered a lot of losses.The empty () function is used to test whether the variable has been

What this article brings to you is about how the Isset function in PHP differs from the empty function when used? (comprehensive), there is a certain reference value, the need for friends can refer to, I hope to help you. PHP's Isset () function is

Is it empty function transformation from php manual php. netmanualhfunction. empty. php? If php is empty, you can determine whether the multi-dimensional array defaults to 0. if the value is not null $ type1, 0 indicates null functionis_empty ($

Today is about the use of the empty function, and what the difference between, and use it to manipulate the array is not return the normal value, the need for friends can refer to. The code is as follows Copy Code $

if $number = =0 )echo ' empty '; if Floatval ($number) = = 0 )echo ' empty 'First, PHP thinks that 0.0 is empty, so 0.00 and 0.000 will also be considered null as 0.0, so empty will return true to express PHP's rules.However, in the world of

Determine whether a variable is considered to be empty. But in my memory, for a long time I thought that empty should be able to tell if something was empty, until one day I had an error like "Empty ($a)" used, Then we'll find out the manual. The

Today I want to talk about the usage of the empty function, what is the difference between empty and other functions, and whether the normal value is returned when you use it to operate the array. If you need it, please refer to it.   The

This article mainly introduces the PHP empty function in the detection of a non variable case of the solution to the error, the need for friends can refer to thePHP development, when you use empty to check the results of a function returned error:

In recent projects, a field is encountered that is "enabled" if the value is 0,1 when the query is not writtenif isset ($args _array[' USEFLG ']) &&! Empty ($args _array[' USEFLG '])) {..... }So I did not find the time for 0, think about it, should

The empty function that PHP is prone to use incorrectly ? Written in the official PHP manual, ?Checks if a variable is empty. If Var is a non-null or nonzero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, Array (), Var

An error occurred yesterday in using the PHP empty () functionCan ' t use function return value in write contextThe first project in the local is good, my local configuration is php5.6+apace after the project moved to the server (the server

Empty function-based output details. $ A; echo1 .---------------. empty ($ ). br; $ a0; echo2 .---------------. empty ($ ). br; $ a0; echo3 .---------------. empty ($ ). br; $ anull; echo4. ----------- $ a = ''; Echo '1. --------------- '. empty ($ )

The following settings enable the form to be maximized, and you cannot drag the small bordericon to---bimax[false] bihelp [False]borderstyle Set as---bssingle reference-------------- You can restrict and control the form's changes by setting the

This title is very around the mouth, but this is also the result of a half-day, I am sorry to the PE teacher.The title is to express: previously talked about using a ComboBox to implement their own proactive cue components. It is only now that the

PHP/** * When Var does not exist, returns true; * Returns True if Var is present and is a non-null nonzero value (truth). * The following things are considered empty: * * 1. "" (empty string) * 2.0 (as an integer of 0) * 3.0.0 (as a floating-point