How I can add more memory for php

PHP Fatal error: Allowed memory size of 268435456 bytes exhausted. - How I can add 512 MB of memory?

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As long as the server or Droplet has additional RAM, you can increase the limit for PHP by modifying your php.ini file and changing memory_limit.

Increasing that limit to 512M may be overkill though and it’s something I’d be careful in doing. If you are seeing a script take that much RAM, I’d see what’s going on and see if it’s possible to optimize it, thus reducing the amount of RAM it can consume at once.

Even for WordPress (as an example), setting memory_limit to 512M would be overkill.

First your server needs to have more memory available. So you can config this on php.ini, in the parameter memory_limit, but these type of error you need to verify if just more memory will solve the problem, or your rotine will consume all and will throw this error again.