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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
echo 'Memory usage before query: ' . memory_get_usage(true) / 1024 / 1024 . 'MB', "\n";
$studentList = $pdo->query("SELECT REPEAT('*', 1024 * 1024 * 5) as data")->fetchAll();
echo 'Memory usage after query: ' . memory_get_usage(true) / 1024 / 1024 . 'MB', "\n";
unset($studentList);
echo 'Memory usage after unset: ' . memory_get_usage(true) / 1024 / 1024 . 'MB', "\n";
gc_collect_cycles();
echo 'Memory usage after gc: ' . memory_get_usage(true) / 1024 / 1024 . 'MB', "\n";