When you open PyCharm for the first time, you should first create a new project and select a virtual environment, and then be familiar with the editor area, toolbar, navigation bar, and status bar. Set up Darcula themes and Consolas fonts, use smart tips and debugging tools to get more efficient, and learn Git integration.

Social security number verification is implemented in PHP through regular expressions and simple logic. 1) Use regular expressions to clean the input and remove non-numeric characters. 2) Check whether the string length is 18 bits. 3) Calculate and verify the check bit to ensure that it matches the last bit of the input.

The steps to effectively use graphical tools to compare the differences in Git versions include: 1. Open GitKraken and load the repository, 2. Select the version to compare, 3. View the differences, and 4. In-depth analysis. Graphical tools such as GitKraken provide intuitive interfaces and rich features to help developers understand the evolution of code more deeply.

The gitstatus command is used to display the status of the working directory and temporary storage area. 1. It will check the current branch, 2. Compare the working directory and the temporary storage area, 3. Compare the temporary storage area and the last commit, 4. Check untracked files to help developers understand the state of the warehouse and ensure that there are no omissions before committing.

In VSCode, you can use Git for code version fallback. 1. Use gitreset--hardHEAD~1 to fall back to the previous version. 2. Use gitreset--hard to fall back to a specific commit. 3. Use gitrevert to safely fall back without changing history.

The steps to manually install the plug-in package in VSCode are: 1. Download the .vsix file of the plug-in; 2. Open VSCode and press Ctrl Shift P (Windows/Linux) or Cmd Shift P (Mac) to call up the command panel; 3. Enter and select Extensions:InstallfromVSIX..., then select .vsix file and install. Manually installing plug-ins provides a flexible way to install, especially when the network is restricted or the plug-in market is unavailable, but attention needs to be paid to file security and possible dependencies.

Configuring VSCode to synchronize code with GitHub can improve development efficiency and team collaboration. First, install the "GitHubPullRequestsandIssues" and "GitLens" plugins; second, configure the GitHub account; then clone or create a repository; finally, submit and push the code to GitHub.

Verifying an IMEISV string in PHP requires the following steps: 1. Verify the 16-bit numeric format using regular expressions. 2. Verify the validity of the IMEI part through the Luhn algorithm. 3. Check the validity of the software version number. The complete verification process includes format verification, Luhn checking and software version number checking to ensure the validity of IMEISV.