Question

<?php
    function iterate($x){ //this is the function
        for ($i = 0; $i <= 10; $i++){ //this is the loop procedure to iterate 10 times
            echo $i; //it will show 0123456789 on the screen
        } 
    }

    $y = "xyz"; //variable declaration
    echo iterate($y); //should be iterate xyz as much 10 times. 
?>

希望在php函数内使用for循环回显（打印）xyz十次，结果不如预期。如何显示xyz迭代十次。

Answer 1

echo $x;这是您传递给函数的值。您不必回显函数，因为函数内部会调用echo。你还需要改变你的柜台。 0到9是10次，或1到10.

function iterate($x){ //this is the function
        for ($i = 0; $i <= 9; $i++){ //this is the loop procedure to iterate 10 times
            echo $x; //it will show xyz on the screen, 10 times
        } 
    }

    $y = "xyz"; //variable declaration
    iterate($y); //should be iterate xyz as much 10 times.

EXAMPLE

Answer 2

看起来你对你正在做的事感到困惑。

您正在打印用于迭代的$ i而不是您传递的那个（i，例如$x）

解决这个问题，你应该回复$x这是你要打印的那个

<?php
    function iterate($x){ //this is the function
        for ($i = 0; $i <= 10; $i++){ //this is the loop procedure to iterate 10 times
            echo $x; //it will show 0123456789 on the screen
        } 
    }
?>

既然逻辑已修复，那么在这里仍然存在一些问题，你打印的函数是打印xyz。

<?php
    $y = "xyz"; //variable declaration
    iterate($y); //should be iterate xyz as much 10 times. 
?>

结合两种解决方案：

<?php
    function iterate($x){ //this is the function
        for ($i = 0; $i <= 10; $i++){ //this is the loop procedure to iterate 10 times
            echo $x; //it will show 0123456789 on the screen
        } 
    }

    $y = "xyz"; //variable declaration
    iterate($y); //should be iterate xyz as much 10 times. 
?>

Answer 3

如果我理解你的问题

for ($i = 0; $i <= 10; $i++){ 
        echo $y; //instead of xyz
    }

Answer 4

 <?php

     function iterate($x){ //this is the function
         for ($i = 0; $i < 10; $i++){ //this is the loop procedure to iterate 10 times
             echo "{$x}<br/>"
         } 
     }

     $y = "xyz"; //variable declaration
     echo iterate($y); //should be iterate xyz as much 10 times.

如何在php函数中使用for循环

4 个答案: