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第4篇:PHP循环结构与流程控制

  • 2026-04-17 17:48:30
第4篇:PHP循环结构与流程控制

PHP循环结构与流程控制

程序最强大的地方在于可以重复执行任务——这就是循环的作用。这篇文章会介绍PHP中的各种循环语句,让你的程序能够自动完成重复性的工作。

一、为什么需要循环?

假设要打印1到100的数字,不用循环的话:

<?phpecho"第1个数字\n";echo"第2个数字\n";echo"第3个数字\n";// ... 还要写97行?>

用循环,一行代码就搞定了:

<?phpfor ($i = 1$i <= 100$i++) {echo"第{$i}个数字\n";}?>

这就是循环的力量。

二、for循环

for循环是最常用的循环,适合已知循环次数的场景:

<?php// 语法:for (初始值; 条件; 步进) { 循环体 }// 打印1到10echo"打印1到10:\n";for ($i = 1$i <= 10$i++) {echo$i . " ";}echo"\n";// 计算1到100的累加和echo"\n计算1到100的累加和:\n";$sum = 0;  // 初始化累加器for ($i = 1$i <= 100$i++) {$sum += $i;  // $sum = $sum + $i}echo"1 + 2 + 3 + ... + 100 = " . $sum . "\n";  // 输出5050// 打印九九乘法表echo"\n九九乘法表:\n";for ($i = 1$i <= 9$i++) {for ($j = 1$j <= $i$j++) {echo"{$i}×{$j}=" . ($i * $j) . "\t";    }echo"\n";}?>

代码讲解:

  • for循环有三个部分,用分号隔开:
    • $i = 1:初始值,只执行一次
    • $i <= 10:判断条件,每次循环开始前检查
    • $i++:步进,每次循环结束后执行
  • for ($i = 0; $i < 10; $i++)是最常见的写法,遍历0到9
  • 九九乘法表展示了嵌套循环(循环里再放循环)

输出结果(部分):

打印1到10:1 2 3 4 5 6 7 8 9 10 计算1到100的累加和:1 + 2 + 3 + ... + 100 = 5050九九乘法表:1×1=1 2×1=2 2×2=4 3×1=3 3×2=6 3×3=9 ...

三、while循环

while循环适合不知道具体循环次数的场景:

<?php// 猜数字游戏$secret = 37;  // 秘密数字$guess = 0;    // 猜测值$attempts = 0// 尝试次数echo"猜数字游戏(1-100):\n";while ($guess != $secret) {  // 条件为真时继续循环$attempts++;// 模拟猜测(实际中这里会是用户输入)$guess = rand(1100);if ($guess < $secret) {echo"第{$attempts}次:{$guess} 太小了,再大一点!\n";    } elseif ($guess > $secret) {echo"第{$attempts}次:{$guess} 太大了,再小一点!\n";    }// 防止无限循环(如果随机猜到的话)if ($attempts >= 100) {echo"尝试次数太多,游戏结束!\n";break;  // 强行退出循环    }}if ($guess == $secret) {echo"\n恭喜!答案就是{$secret},你用了{$attempts}次猜对!\n";}?>

代码讲解:

  • while循环先判断条件,条件为真才执行循环体
  • break可以强行退出循环,常用于游戏或搜索场景
  • 如果条件永远为真,就会产生死循环,这是要避免的

四、do-while循环

do-while至少会执行一次循环体:

<?php// 菜单系统$choice = "";do {echo"\n===== 菜单 =====\n";echo"1. 查看余额\n";echo"2. 存款\n";echo"3. 取款\n";echo"4. 退出\n";echo"请选择(1-4):";// 模拟用户选择(实际中是用户输入)$choice = rand(14);echo$choice . "\n";switch ($choice) {case1:echo"您的余额:¥10000.00\n";break;case2:echo"存款成功!\n";break;case3:echo"取款成功!\n";break;case4:echo"感谢使用,再见!\n";break;    }while ($choice != 4);  // 注意这里有分号?>

代码讲解:

  • do-whilewhile的区别:do-while先执行一次,再判断条件
  • 所以即使条件一开始就不满足,循环体也会执行至少一次

五、foreach循环

foreach是专门用来遍历数组的:

<?php// 遍历索引数组$fruits = ["苹果""香蕉""橙子""葡萄""西瓜"];echo"水果列表:\n";foreach ($fruitsas$index => $fruit) {echo ($index + 1) . ". " . $fruit . "\n";}// 遍历关联数组echo"\n学生信息:\n";$student = ["name" => "李明","age" => 20,"major" => "计算机科学","grade" => "大三"];foreach ($studentas$key => $value) {// 根据键名做不同处理$label = match($key) {"name" => "姓名","age" => "年龄","major" => "专业","grade" => "年级",default => $key    };echo$label . ":" . $value . "\n";}?>

代码讲解:

  • foreach ($array as $item):遍历数组,只获取值
  • foreach ($array as $key => $item):遍历数组,同时获取键和值
  • as $index => $fruit中,$index是数字索引,$fruit是值

六、流程控制:break和continue

<?php// 找出1-100中第一个能被7整除的数字echo"找出1-100中第一个能被7整除的数字:\n";for ($i = 1$i <= 100$i++) {if ($i % 7 == 0) {  // % 是取余运算符echo"找到了:是{$i}\n";break;  // 找到后立即退出循环,不再继续    }}// 计算1-100中偶数的和,但跳过10到20之间的数echo"\n计算1-100中偶数的和(跳过10-20):\n";$sum = 0;$count = 0;for ($i = 1$i <= 100$i++) {if ($i >= 10 && $i <= 20) {continue;  // 跳过这次循环,继续下一次    }if ($i % 2 == 0) {  // 偶数$sum += $i;$count++;    }}echo"偶数个数:{$count}个\n";echo"偶数总和:{$sum}\n";?>

代码讲解:

  • break:立即退出整个循环
  • continue:跳过本次循环的剩余代码,继续下一次循环
  • 这两个命令可以精确控制循环的执行流程

七、实战:筛选数组数据

<?php// 成绩列表$scores = [8592789667887395825910045];echo"原始成绩:" . implode(", "$scores) . "\n";// 找出不及格的成绩echo"\n不及格(<60分):\n";$failed = [];foreach ($scoresas$score) {if ($score < 60) {$failed[] = $score;  // [] 是 array_push() 的简写    }}echoimplode(", "$failed) . "\n";// 计算平均分$average = array_sum($scores) / count($scores);echo"\n平均分:" . round($average2) . "分\n";  // round() 四舍五入// 统计各等级人数echo"\n成绩等级分布:\n";$grade_counts = ["A(90+)" => 0"B(80-89)" => 0"C(70-79)" => 0"D(60-69)" => 0"F(<60)" => 0];foreach ($scoresas$score) {if ($score >= 90) {$grade_counts["A(90+)"]++;    } elseif ($score >= 80) {$grade_counts["B(80-89)"]++;    } elseif ($score >= 70) {$grade_counts["C(70-79)"]++;    } elseif ($score >= 60) {$grade_counts["D(60-69)"]++;    } else {$grade_counts["F(<60)"]++;    }}foreach ($grade_countsas$grade => $count) {echo"{$grade}{$count}人\n";}?>

代码讲解:

  • implode(", ", $array)把数组元素用分隔符连接成字符串
  • array_sum()计算数组所有元素的和
  • count()计算数组元素个数
  • $array[] = $value是往数组末尾添加元素的简写方式
  • ++运算符用于计数器

八、写在最后

循环是编程中最强大的工具之一。记住:for适合已知次数,while适合条件驱动,foreach专门处理数组。下一篇我们会学习函数,那是更高层次的代码组织方式。

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  1. CONNECT:[ UseTime:0.000558s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000734s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000282s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000521s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000581s ]
  8. SELECT * FROM `article` WHERE `id` = 484108 LIMIT 1 [ RunTime:0.005218s ]
  9. UPDATE `article` SET `lasttime` = 1776642916 WHERE `id` = 484108 [ RunTime:0.013980s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000266s ]
  11. SELECT * FROM `article` WHERE `id` < 484108 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000447s ]
  12. SELECT * FROM `article` WHERE `id` > 484108 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002117s ]
  13. SELECT * FROM `article` WHERE `id` < 484108 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003441s ]
  14. SELECT * FROM `article` WHERE `id` < 484108 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003564s ]
  15. SELECT * FROM `article` WHERE `id` < 484108 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003681s ]
0.104380s