not equal

DevOps is a hot word, but there is no doubt that it is the future trend (note 1). Efficient IT organizations are often labeled with DevOps, which is the focus of people's discussions and the object of learning. 2009, everyone was talking about how

$sum=(0.5+0.2+0.2+0.1);//var_dump float(1)$sum2=1 //var_dump int(1)$sum == $sum2 //var_dump bool(false) What's the matter, please?In addition, the following tests are possible.For example （0.5+0.2+0.3+0.0)==1 //var_dump bool(true) Reply

Find a bug in your job: My company server PHP default timezone and timezone are configured to America/los_angeles; Time Stamp 1457856000, Formatted with the date () function is 2016-03-13 00:00:00; But after adding 3600*24-1 seconds to the

Today do information collection page encountered a strange problem, study for a long time to find the root cause of the problem, it is a bit strange indeed. (the younger brother often uses the C #, Java and other languages, PHP only occasionally in

The table has a lot of data, but a few are strange, the field is float type, 2 values are the same Payment value =299.7 Feiyong value =299.7 Query statement: feiyong>0 and Payment>0 and Payment At this point can still query out, and just

Self is very useful in distinguishing global variables/functions from member variables/functions in objects. For example, it provides a scope mechanism. I personally think it is much clearer than Ruby's @ and @. This may be a habit, but it is indeed

More and more small and medium-sized enterprises began to test water network marketing, but most of the small and medium-sized managers to it formed a mistaken understanding, that as long as the cost of thousands of yuan to do a website is marketing,

For example, the following code: {code...} while ($ strue) {} cannot be displayed? Where can I use true ~~ For beginners, please take care of O (∩ _ ∩) O ~ Happy New Year ~ My own understanding is :! If 'false' is true, 1. The value is not equal to 2

For example, the following code: $str4="php-class,mysql-class,div-css,0,dreamweaver";$s=strtok($str4,',');while($s!==false){ echo $s.""; $s=strtok(',');} while ($s ===true) {} Why can't it be displayed?True where to use it ~ ~Beginners Please

The Shell, like other programming languages, supports a variety of operators, including:Arithmetic operatorsRelational operatorsBoolean operatorString operatorsFile Test OperatorsNative bash does not support simple math operations, but can be

Shell Basic OperatorsThe Shell, like other programming languages, supports a variety of operators, including: Relational operators Boolean operator String operators File Test Operators Native bash does not support simple

KMP algorithm, also known as "See the Cat Slice" algorithm (mistake), is an improved string pattern matching algorithm, can be in O (n+m) time complexity to complete the string matching operation, the core idea is: when the match process occurs when

In js, there is one equals sign, two equals signs, three equals signs, one is a value equals sign, and the other is a comparison equals sign. So what is the use of the three equals signs, next, I will introduce three equal signs. Sometimes we can

The equals and hashCode methods in Java are in the Object, so each Object has these two methods. Sometimes we need to implement specific requirements, and we may need to rewrite these two methods, today we will introduce the functions of these two

First, Shell introductionThe shell is a program written in C that is a bridge for users to use Linux.The shell is both a command language and a programming language.A Shell is an application that provides an interface through which users access the

Look for the position of the pattern string p in the string s, which is a string match problem.To illustrate:i = 0 1 2 3 4 5 6 7 8 9 b A a c a B A a a b a a = a b a a = 0 1 2 3 4Before the invention

First, Arithmetic Operators Operator Name Describe Instance Results X + y Add X and Y's and 2 + 2 4 X-y Reducing The difference between x and Y 5-2

Through the introduction of the previous section, learned the common pattern matching algorithm, the general idea is: The pattern string from the first character of the main string to match, each match failed, the main string record matching

When two fields in OraclePLSQL are judged to be equal or not equal, it often appears that the field values are clearly not equal (one is empty, one is not empty), but when the judgment is not equal When two fields in Oracle PL/SQL are judged to be

Why must I rewrite hashcode while rewriting equal?Hashcode is different integers generated by the compiler for different objects. According to the equal method, if two objects are equal (equal), the two objects must call hashcode to produce the same