Script memory usage exceeds memory_limit configured in php.ini.
PHP engine halts script execution because the memory required by variables/objects exceeds `memory_limit` (e.g. 128M).
Loading massive database query results or large files into a single array in memory instead of processing in chunks/generators.
1<?php2// Attempting to read a 2GB file entirely into string variable3$data = file_get_contents("huge_database_dump.sql"); // Fatal error: Allowed memory size exhausted!1<?php2// Fix: Process file line by line using streams / generators3$handle = fopen("huge_database_dump.sql", "r");4if ($handle) {5 while (($line = fgets($handle)) !== false) {6 // Process single line in memory...7 }8 fclose($handle);9}Simulate standard system builds to trigger compiler trace records and track memory crashes locally.
The default PHP memory limit is often 128MB or 512MB. Reading a multi-gigabyte file into memory exceeds this ceiling.