- memory_get_usage: documentation ( source)
- implode: documentation ( source)
- number_format: documentation ( source)
<?php
$a = array();
for ($i=0; $i<100000; $i++) $a[] = $i;
$a = implode(',', $a); // or $a = json_encode($a);
echo number_format(memory_get_usage(true)/1048576, 2)."\n";