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@ 2014-10-13T15:52:25Z

<?php

while (true) {
    $reader = new XMLReader();
    $reader->xml('<?xml version="1.0" encoding="utf-8"?><id>1234567890</id>');
    while ($reader->read()) {
        $reader->expand();
    }

    echo memory_get_peak_usage(true) . PHP_EOL;
}

Output
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memory_get_peak_usage: documentation ( source)

preferences:dark modelive preview

38.14 ms | 402 KiB | 5 Q