If Script A writes data into the first row while Script B is currently reading it, you might indeed end up with corrupted data for that line. The chances of that happening depends on the frequency of these operations. It's likely slim. But in theory, this could happen.
The easiest way to protect against that is to use
Your script writing to the file has to acquire an exclusive lock when it wants to write to the file. Your script reading the file will have to check whether the file is currently locked. If it is, the script can wait for the file to be released again.
Note that this approach assumes that the file will only ever be changed by these two PHP scripts.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/
Slim is, as its name suggests, a micro-framework that is compact and fast. The reason for its such characteristics lies in the fact that it is completely independent of third-party code. It was created in 2010, at the moment its most recent version is 4.5.0.
https://www.slimframework.com/
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