Also, you can increase PHP’s memory limit for specific websites. It would be best if you always optimized as the preferred option when possible. If you don’t have available memory on your server, you’ll sometimes be faced with deciding whether to increase PHP memory_limit to meet the requirements of scripts or to optimize your code. Until fixed, you may want to temporarily increase PHP memory_limit to avoid your web application becoming unusable due to PHP out-of-memory errors. In the above issue, that was not the case, so regardless of the 256M or 1G memory_limit setting, it only comes into play if there are inefficient scripts.įortunately, the PHP memory_limit setting will block inefficient code, alerting you to optimize your code. A lower setting of 256M is always better because if PHP scripts are trying to use more than 256M, those scripts would now return memory limit exceeded errors. Now, regarding the original example mentioned at the outset. PHP memory_limit is per-script, just as a highway’s speed limit is per-vehicle. “The require_once() statement is identical to require() except PHP will check if the file has already been included, and if so, not include (require) it again.” – php.net The require() generates a fatal error, and the script will stop.” – W3schools. If an error occurs, the include() function generates a warning, but the script will continue execution. The require() function is identical to include(), except that it handles errors differently. “The include statement takes all the text/code/markup that exists in the specified file and copies it into the file that uses the include statement. That said, for scripts that request other PHP scripts inline using require, include, or include_once, this limit is then inherited and shared by all included scripts that are dependent on the parent script. Yet, in this scenario, a PHP memory_limit setting of ‘256M’ per script would not be hit. Thus, if five PHP scripts simultaneously use 100 MB each, that would consume 500 MB of total PHP memory usage on the server. Remember, PHP is not designed for and does not support multithreading. They do not share the memory_limit setting. So, for example, if two or more scripts are requested simultaneously, each is completely independent of the other. Or like this: PHP Fatal error: Out of memory (allocated x) (tried to allocate x bytes) in /path/to/php/script When blocked, the resulting error output looks something like this: Fatal error: Allowed memory size of x bytes exhausted (tried to allocate x bytes) in /path/to/php/script PHP memory_limit is the maximum amount of server memory a single PHP script is allowed to consume. Unlike, say, MySQL’s innodb_buffer_pool settings, the PHP memory_limit setting is not a storage space where multiple PHP scripts pool from or grow within. This helps prevent poorly written scripts for eating up all available memory on a server. PHP.net’s documentation puts it this way: This sets the maximum amount of memory in bytes that a script is allowed to allocate.
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