<?php for ($i = 0; $i < 10; $i++) { for ($j = 0; $j < 10; $j++) { echo $i+$j, "\n"; } } $_main: ; (lines=16, args=0, vars=2, tmps=7) ; (before optimizer) ; /private/tmp/hoge.php:1-2 L0: ASSIGN CV0($i) int(0) L1: JMP L13 L2: ASSIGN CV1($j) int(0) L3: JMP L9 L4: T4 = ADD CV0($i) CV1($j) L5: ECHO T4 L6: ECHO string(" ") L7: T5 = POST_INC CV1($j) L8: FREE T5 L9: T6 = IS_SMALLER CV1($j) int(10) L10: JM