PHP Fatal error: Allowed memory size of solution

In recent years, many web developers have encountered the "Allowed memory size" error when PHP is running. The meaning of this error is: the memory requested by the PHP process is larger than the maximum memory value set by the server, causing the process to be unable to continue execution. There are many reasons for this, such as working with large numbers of images or files, working with large databases, or simple recursive problems. These issues may cause different "Allowed memory size" errors when running PHP scripts.

Some developers try to work around this error by increasing the maximum memory size required by the PHP process at this time. However, in many cases, this approach is not a wise solution. While this solves the short-term problem, it is only a single service and each request spawns a new process, eventually running out of swap space and RAM.

In order to solve this problem in the longer term, we can take the following measures:

1. Query data in chunks

When querying or operating a large amount of data from the database, it is best to It is best to divide the data into chunks for processing. This can be done by modifying the query or action statement to chunk it, or by manually loading "paginated" chunks of data. This makes PHP require less memory to run, thereby reducing the possibility of "Allowed memory size" errors.

2. Optimize the code

Check the script code and make necessary optimizations, which can significantly reduce the memory usage of PHP runtime. When writing PHP scripts, pay attention to the code complexity and use some efficient algorithms and data structures.

3. Use cache

Using cache to improve the efficiency of the program can greatly reduce the memory requirements of the PHP process. For example, for frequently called libraries and functions, they can be cached in memory to reduce resource consumption.

4. Check PHP extensions

PHP needs to use a large number of extensions when running, some of which may affect the way the process uses memory. PHP developers can consider disabling unnecessary extensions or updating to a version to avoid this problem.

5. Customize php.ini

By default, PHP uses the php.ini file to set the parameters of the service, including the maximum memory limit. When the "Allowed memory size" error occurs at runtime, it can be solved by modifying the php.ini file and adjusting the values ​​of these parameters.

In general, we should take precautions against "Allowed size memory" errors. This ensures the stability and reliability of PHP scripts and improves the performance of the entire web application.

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