for (expr1; expr2; expr3) statement |
<?php for (;;) { //放置需要不断执行的语句 } ?> |
<?php for (;;) { //如果是公元2199年,则跳出循环 if (date('Y') == '2199') { break; } } ?> |
<?php if (isset($i)) { unset($i); if ((int) date('') < 2008) { $i = 0; } else { $i = 1; } } else { $i =3; } for (;$i < 10;$i++) { echo $i; } ?> |
<?php for ($i = 0, $j = 10;$i <= 10;$i++, $j--) { echo "$i + $j = 10rn"; } ?> |
0 + 10 = 10 1 + 9 = 10 2 + 8 = 10 3 + 7 = 10 4 + 6 = 10 5 + 5 = 10 6 + 4 = 10 7 + 3 = 10 8 + 2 = 10 9 + 1 = 10 10 + 0 = 10 |
<?php //计算1-5的累加结果,斌值到$j for ($i = 1,$j = 0; $i <= 5;$j += $i++); echo $j; //计算1-5的阶乘结果,斌值到$j for ($i = 1,$j = 1; $i <= 5;$j *= $i++); echo $j; ?> |
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