- memory_get_peak_usage: documentation ( source)
- memory_get_usage: documentation ( source)
<?php
$arr = [];
for($x = 0; $x <= 100_000; $x++) $arr[] = [1,2];
echo "Current memory usage: " . (memory_get_usage() / 1024) . " KB\n";
echo "Peak memory usage: " . (memory_get_peak_usage() / 1024) . " KB\n";