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<?php $a = array(); $a['1'] = 'toto'; $m = memory_get_usage(); $a['2'] = 'titi'; $m2 = memory_get_usage(); $a['1000000'] = 'tata'; $m3 = memory_get_usage(); echo ( $m2-$m ) . ' '. ( $m3 - $m );

preferences:
29.15 ms | 402 KiB | 5 Q