Mysql-PHP Best Practice: when adding unique data, do you need to query and compare the data in advance, or use trycatch for processing? Which efficiency is high?

Common scenarios: If I want to add a unique album and a user's favorite record. Currently, I have two methods: Check whether there is an aid and uid in advance, and then determine whether to add-code layer. Add a uniquekey to the aid and uid, and

Php simulated server autoindex effect method

This article describes how to implement autoindex on a php simulated server. The example analyzes php URL operations and passing parameters. It has some reference value. For more information, see This article describes how to implement autoindex on

Improvement on merging arrays with the same key value of a field in php

This article mainly introduces php's improvement on merging arrays with the same key values for a certain field. For more information, see This article mainly introduces php's improvement on merging arrays with the same key values for a certain

How to get a video preview from the FLV file in PHP

This article describes how to obtain a video preview from a FLV file in PHP. The example analyzes the php flv file acquisition skills and provides some reference value. For more information, see This article describes how to obtain a video preview

What is the problem with the javascript-interface UncaughtSoapFaultexception?

This {code...} is reported when an interface is called. Uncaught SyntaxError: Unexpected token Fatal error: Uncaught SoapFault exception: [HTTP] Could not connect to host in

Random Number-PHP random data reading problem !!!

My library contains 500 answer questions and multiple choice questions. When I want to go to the answer page, the system reads 10 answer questions and 40 multiple-choice questions from the database (first put the 10 answer questions Randomly Read

Javascript-How to Use php to implement chained operations similar to js?

{Code ...} $ Str = new str (); // how to implement a chained operation like this? $ Str-> str ()-> length (); Reply content: $ Str = new str (); // how to implement a chained operation like this? $ Str-> str ()-> length (); Class MyClass

PHP class problems

Why does the $ symbol classclassname {code...} not need to be used for internal attribute usage in the class? Why does the $ symbol not need to be used for internal attribute usage in the class? Class classname { $ Attribute; function get ()

Javascript-I feel like I have dug a hole in php and python

Python has been learning for a while (using python as a website since 14 years). Currently, basic things can be solved. But... Coordinates: Nanjing .... After reading the market and 58 months, you may not have a seat. Can you give me a suggestion? I

What are common problems with curl?

I use curl to retrieve cross-Origin data. The test end is good. It's okay. Now, the data will be officially launched. The data will be available for a while, but not for a while. What's wrong? I use curl to retrieve cross-Origin data. The test end

In the phpcurl_multi_exec official website, why is there dowhile twice?

It is difficult to use, and this example still cannot run under 5.5 (the following UserContributedNotes provides a solution) {code ...} who can help explain this part? The usage is so strange! {Code ...} the official website explains

Php restricts the upload file type and saves the uploaded file

This article mainly introduces php's method of limiting the File Upload type and saving the file to be uploaded. It involves php's common operation skills for uploading files and is very useful. For more information, see This article mainly

Php method to include other files relative to the current file

This article mainly introduces the method of adding other files to the current file in php. The example analyzes the usage skills of include introduced files in php, which is very useful. For more information, see This article mainly introduces the

Javascript-why does Sina Weibo's source code contain user data in json format?

Right-click the Weibo page to view the source code of the page. The user's logon information is saved in json. Why is the user information obtained after a user logs on to the source code? Right-click the Weibo page to view the source code of the

How to save an object to a Session in php

This article mainly introduces how to save an object to a Session in php. It involves php Object operations and session skills and has some reference value. For more information, see This article mainly introduces how to save an object to a Session

How many times does mysql compile SQL statements like this?

Insertintotablevalues (null, & #039; abc & #039;, & #039; 123@qq.com & #039;); insertintotablevalues (null, & #039; abc & #039 ;, & #039; 123@qq.com & #039;); insertintotablevalues (null, & #039; abc & #039;, & #039; 123@qq.com & #039 ;); execute

Javascript-how can I share this vue component?

This is my demo: jsfiddle. netne92wfxp8 has two problems: 1. In this foreach loop, how can I share this vue component? 2. How do I display the previously selected option when I open this page? Instead of opening the page every time, this is my demo:

The variables passed in by pathinfo in Thinkphp cannot be a single character. Why?

I started my experiment and found that I couldn't do it. I checked it for a long time. It turns out $ a and $ B are all letters and changed to $ aa. $ bb: {code ...} {code ...} what is the reason? Is it a PHP rule ?, Or thinkPHP? What information

Php file size and Creation Time

This article describes how to obtain the file size and file creation time in php. It involves the use of filesize and fileatime functions in php and has some reference value. For more information, see This article describes how to obtain the file

Yii framework loads images as needed

Yii has a method for loading js or css as needed. registerScript. Is there a method for loading image files or folders as needed? version yii is 1.1, thanks! yii has a method for loading js or css as needed. registerScript. Is there any method for

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