Solution to PHP Fatal error: Allowed memory size of bytes exhausted

PHP is a widely used server-side scripting language, but when running a PHP application, you may encounter the error message 'PHP Fatal error: Allowed memory size of bytes exhausted', which usually means memory allocation problems .

In this article, we will explore some common causes of ‘PHP Fatal error: Allowed memory size of bytes exhausted’ errors and provide some solutions.

1. Cause: Memory Limit

First of all, it is important to understand that PHP has a memory limit, which limits the amount of memory that a PHP script can use. By default, the PHP memory limit is set to 128MB. When PHP attempts to use an amount of memory greater than the memory limit, a 'PHP Fatal error: Allowed memory size of bytes exhausted' error will occur.

Solution: Increase the memory limit

You can increase the memory limit by modifying the 'php.ini' file or calling the 'ini_set()' function. If you have permission to modify the 'php.ini' file, please find the following code and increase the memory limit to the required size:

memory_limit = 256M

If you cannot modify 'php.ini' ' file, please use the following code to increase the memory limit:

ini_set('memory_limit', '256M');

It should be noted that when calling the 'ini_set()' function in the script , you need to use this function at the very beginning of the code.

2. Cause: Infinite recursion

Infinite recursion is another common cause of 'PHP Fatal error: Allowed memory size of bytes exhausted' error. When a function recurses infinitely, it will take up more and more memory space, eventually causing the memory limit to be exhausted.

Solution: Avoid infinite recursion

Make sure your PHP application does not recur infinitely. To avoid this happening, you can do the following:

• Add a termination condition at the beginning of the recursive function
• Try a non-recursive solution

3. Cause : Large array or object

The 'PHP Fatal error: Allowed memory size of bytes exhausted' error occurs when you try to use a large array or object that exceeds the memory limit in a PHP application.

Workaround: Batch Processing

For large data sets, you can process the data in batches, which can reduce memory usage so that your PHP application can manage them. You can also use PHP's iterator concept to avoid using large amounts of memory.

4. Cause: Some extensions are used

When your PHP application depends on certain extensions, these extensions may cause the memory limit to be exceeded.

Workaround: Load only necessary extensions

Make sure your application only loads necessary extensions. Removing unnecessary extensions can help reduce memory usage.

Summary

In this article, we have introduced some common causes and solutions of ‘PHP Fatal error: Allowed memory size of bytes exhausted’ error. Following these best practices can help you avoid memory limit issues and make your PHP applications more stable and efficient.

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