empty function

A detailed description of the differences between phpempty () and isset. When using php to write page programs, I often use the variable processing function to determine whether the variable value of a parameter at the end of the php page is null.

This article describes in detail the internal prototype _ proto _ of javascript and the prototype of the constructor, as well as the similarities and differences between them. It is very detailed. If you need it, come and study it. _ Proto _ is the

Php: the difference between phpempty () and isset () is that when php is used to compile page programs, I often use the variable processing function to determine whether the value of a variable at the end of the php page is null. at the beginning, I

PHP has several functions that can be used to test the state of a variable. The first function is isset (). It has the following function prototype: boolisset (mixedvar); [; mixedvar [,...]). This function requires a variable name as the

Introduction: This article introduces two new features of the C ++ 11 standard: defaulted and deleted functions. For the defaulted function, the compiler automatically generates the default Function Definition body for it to achieve higher code

15-status Mode There are more than one kind of sub-categories in Starcraft. For example, a tank can be mounted, a gun can play doping, or even some passive ones. For example, after being sprayed with green liquid by the Queen of worms, the enemy's

[PHP Source Code Reading] empty and isset functions, emptyisset Recently, I was asked how to judge variables when using empty and isset functions in PHP. At the beginning, I was very frustrated, because I was just a bit confused, in order to

Prototype Pollution and Monkey-Patching, monkeypatching The previous two articles introduce prototype objects and prototype links: JavaScript Object Creation Mode: http://blog.csdn.net/hongse_zxl/article/details/44595809 A deep understanding of the

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

The usage of the output Empty tag in the ThinkPHP template is described in detail. The empty tag of the ThinkPHP template is used to determine whether the template variable is null. The empty tag of the ThinkPHP template is used to determine whether

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. Today I want to talk about the usage of the empty

This article mainly introduces the PHP isset () and empty () the use of the difference, has a certain reference value, now share to everyone, the need for friends can refer to When using PHP to write a page program, I often use the variable handler

[PHP source reading]empty and isset functions, Emptyisset Recently asked about the PHP empty and isset function how to determine the variables, just at the beginning I was a face, because I was just smattering, in order to understand its true

Baidu engineers talk about the implementation principle and performance analysis of PHP function (ii), PHP function Class methodThe class method is executed in the same way as the user function, and is also translated into opcodes sequential

@ Lao Zhao's microblog "is the code generated by eval really inefficient? Http://t.cn/zWTUBEo contains personal attacks, do not like not ."This has aroused recent discussions on eval, and the instructors @ Franky and @ otakustay have also provided

Baidu engineers explain how PHP functions are implemented and Performance Analysis (2) This article mainly introduces the implementation principle and performance analysis of PHP functions (2) by Baidu engineers. This article describes the class

This article is excerpted from: php functions implementation principles and performance analysis. functions are one of the most basic technical units in any language. What are the features of php functions? How is function call implemented? What is

For details about the differences between PHP isset () and empty (), issetempty When using php to write page programs, I often use the variable processing function to determine whether the variable value of a parameter at the end of the php page is

For details about _ proto _ and prototype in javascript, __proto_prototype _ Proto _ is the internal prototype, and prototype is the constructor prototype (the constructor is actually a function) The prototype of the constructor is an object. So

This article mainly introduces the Baidu engineer to talk about the implementation of PHP functions and performance Analysis (ii), this article explains the class method, performance comparison, built-in functions and user function performance