php过滤垃圾留言(评论)信息功能
由于本博客经常遭遇一些好奇人士做各种测试,我经常会在文章评论的数据库里面看到各种奇奇怪怪的评论,要么是各种双引号,单引号,sql语句关键词等各种尝试,要么就是一些毫无意义的评论,所以对于文章评论这块不得不做了各种限制,垃圾评论信息过滤是最近才加上去的,参照了网上的一些案例,下面在此记录分享一下。
function isValidData($s){ if(preg_match("/([\x{4e00}-\x{9fa5}].+)\\1{4,}/u",$s)){ return false;//同字重复5次以上 }elseif(preg_match("/^[0-9a-zA-Z]*$/",$s)){ return false;//全数字,全英文或全数字英文混合的 }elseif(strlen($s) <p><font face="Courier New">以上垃圾信息过滤功能还是非常简单粗糙的,不过是应急之需,待有空了参照一下wordpress这种开源程序的垃圾信息过滤功能再继续补充。如果你有更好的方法或者想法请在下方留言帮以完善,作者将不胜感激。</font></p> <p style="width:100%;text-align:center;margin:10px 0"> <br> <br> </p><p style="width:100%;text-align:center;margin:10px 0"> </p><p class="clear"></p>

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The usage of return in C language is: 1. For functions whose return value type is void, you can use the return statement to end the execution of the function early; 2. For functions whose return value type is not void, the function of the return statement is to end the execution of the function. The result is returned to the caller; 3. End the execution of the function early. Inside the function, we can use the return statement to end the execution of the function early, even if the function does not return a value.

Source code: publicclassReturnFinallyDemo{publicstaticvoidmain(String[]args){System.out.println(case1());}publicstaticintcase1(){intx;try{x=1;returnx;}finally{x=3;}}}#Output The output of the above code can simply conclude: return is executed before finally. Let's take a look at what happens at the bytecode level. The following intercepts part of the bytecode of the case1 method, and compares the source code to annotate the meaning of each instruction in

Vue3.2 setup syntax sugar is a compile-time syntax sugar that uses the combined API in a single file component (SFC) to solve the cumbersome setup in Vue3.0. The declared variables, functions, and content introduced by import are exposed through return, so that they can be used in Vue3.0. Problems in use 1. There is no need to return declared variables, functions and content introduced by import during use. You can use syntactic sugar //import the content introduced import{getToday}from'./utils'//variable constmsg='Hello !'//function func

Usage of return in JavaScript requires specific code examples In JavaScript, the return statement is used to specify the value returned from a function. Not only can it be used to end the execution of a function, it can also return a value to the place where the function was called. The return statement has the following common uses: Return a value The return statement can be used to return a value to the place where the function is called. Here is a simple example: functionadd(a,b){

JavaScript functions provide two interfaces to interact with the outside world. The parameters serve as the entrance to receive external information; the return value serves as the outlet to feed back the operation results to the outside world. The following article will take you to understand the JavaScript function return value and briefly analyze the usage of the return statement. I hope it will be helpful to you!

How to use return in JavaScript requires specific code examples. In JavaScript, return is a very important keyword. It is usually used to return a value in a function or end the execution of a function. The return statement is used to return a value to the caller of the function and terminate the execution of the function. The return statement can be used anywhere in a function and can return any JavaScript data type, including numbers, strings, booleans,

Python return value return usage is that when the function executes the return statement, execution will stop immediately and the specified value will be returned to the place where the function was called. Detailed usage: 1. Return a single value; 2. Return multiple values; 3. Return a null value; 4. End the execution of the function early.

Usage and precautions of the elseif keyword in PHP In PHP programming, elseif is a very useful keyword for adding more branches to conditional judgments. This article will introduce the usage and precautions of the elseif keyword in detail. Syntax and usage: The elseif statement is used to add a new branch to the conditional judgment, which makes a judgment when the condition in the if statement is not met. Its basic syntax is as follows: if(condition1){//Execute code block
