In shared environments or complex backend processing, scripts often dynamically alter their memory limit at runtime using ini_set('memory_limit', '2G'). PHP 8.5 introduces a new INI directive called max_memory_limit, which acts as an unpassable upper bound. Even if a script attempts to increase memory_limit via code, it cannot exceed max_memory_limit set by system administrators.

PHP 8.5 Example:

PHP
// php.ini setting:
// max_memory_limit = 512M

ini_set('memory_limit', '1024M'); 
// In PHP 8.5, this request will be capped by max_memory_limit
echo ini_get('memory_limit'); // Maxed out at 512M

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