GOOCODE - Find your code/scripts

0 In today's digital age, search engines have become an integral part of our everyday lives. They enable us to explore the vast universe of information available on the internet and find answers to our questions or solutions to our problems in mere seconds. Open source search engine scripts offer users the ability to create and customize their search engines to better suit their specific needs. In this essay, we will delve into the world of open source search engine scripts, examining their benefits, drawbacks, popular examples, and the future outlook of this technology.

0 Search engines are an essential tool for navigating the vast amounts of data available on the internet. While there are many proprietary search engines available, open source search engine scripts provide a free and customizable alternative. In this essay, we will explore the advantages and challenges of using open source search engine scripts.

0 The internet is vast, and finding specific information can be a challenge. One of the tools that make this easier is search engines. From Google to Bing, these powerful systems sift through the massive amounts of data on the web to deliver the most relevant results. However, with the advent of PHP search engine scripts, web developers can create custom search engines tailored to specific needs or niches.

0 Today we will focus on front-end encryption. Some projects involve more sensitive data, and developers will require the front end to encrypt the data before transmitting it to the back end for decryption processing. Although https has actually played a great role in protecting data transmission, for users who do not use https, front-end encryption still has a certain significance.

This article involves:
The front end uses CryptoJS to encrypt and decrypt DES or AES data;
The backend uses PHP openssl to decrypt and encrypt the data.

0 Unlike other programming languages ​​that throw exceptions when encountering errors, PHP also has an exception mechanism when handling objects, but PHP will perform as happily as possible and ignore what happened, unless it encounters an extremely serious error. There is an exception. This article outlines PHP-related error exception handling mechanisms.

PHP has several error severity levels. The three most common types of information are errors, notices, and warnings. They have different severity: E_ERROR, E_NOTICE and E_WARNING. The error is a serious problem during operation, usually caused by code error, it must be corrected, otherwise PHP will stop execution. Notifications are information of a recommended nature, because the program code may cause problems during execution, but the program will not stop. The warning is a non-fatal error, and program execution will not be aborted.

0 When working with the Unicode character set, use the corresponding function instead of the native string function. For example, if a file is encoded as UTF-8 PHP code, if the strlen() function is wrong, use the mb_strlen() function instead.

If you use substr to intercept Chinese characters, garbled characters will appear, because substr is intercepted in bytes. That is, UTF-8 encoded Chinese, using substr interception, will only intercept 1/3 Chinese, of course, garbled. When UTF-8 is encoded, a Chinese character is 3 bytes. Similarly, different languages in other countries will produce multi-byte strings, so we use mb_strlen() to handle them.

0 Never know the user's password, we must encrypt the user's password, and can not save the user's original password directly in the database. Do not limit the user password format. If the format is specified, it may be exploited and cracked by the attacker. Of course, we need to limit the minimum length of the password. It is recommended to use at least 8 bits. The longer the better.

For password security, developers need to:
1, absolutely can not know the user's password, we must encrypt the user's password, can not save the user's original password directly in the database.
2, do not limit the user password format, if the format is specified, it is likely to be exploited and cracked by the attacker, of course, we need to limit the minimum length of the password, it is recommended to at least 8 bits, the longer the better.
3, can not send the user password through the mailbox, when we develop the application to retrieve the password, the user password is not notified to the user by email, but the link to reset the password is sent to the user in the form of mail, let the user Go to reset the password.

0 Never trust external input, don't trust any data from a data source that is not under your direct control. In actual development, there is always someone intentionally or unintentionally injecting dangerous data into PHP code, so PHP security programming becomes important. Generally, we deal with external input security ideas: filtering input and verifying data.

Filtering input means escaping or deleting characters that are not safe from external data.

0 When we do web project development, we often need to periodically back up data, periodically restart a service or periodically execute a PHP program, etc., generally use Crontab under Linux and use scheduled tasks under Windows. This article focuses on the basics of using Crontab under Linux and performing PHP tasks.

Crontab is a commonly used timing execution tool for Unix/Linux systems that runs specified jobs without human intervention.

0 When we do web project development, we often need to periodically back up data, periodically restart a service or periodically execute a PHP program, etc., generally use Crontab under Linux and use scheduled tasks under Windows. This article focuses on the basics of using Crontab under Linux and performing PHP tasks.

Crontab is a commonly used timing execution tool for Unix/Linux systems that runs specified jobs without human intervention.