如何在 PHP For 循环中将数字增加 2
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How to increment a number by 2 in a PHP For Loop
提问by user2586455
The following is a simplified version of my code:
以下是我的代码的简化版本：
<?php for($n=1; $n<=8; $n++): ?>
<p><?php echo $n; ?></p>
<p><?php echo $n; ?></p>
<?php endfor; ?>
I want the loop to run 8 times and I want the number in the first paragraph to increment by 1 with each loop, e.g.
我希望循环运行 8 次，并且我希望第一段中的数字随着每个循环增加 1，例如
1, 2, 3, 4, 5, 6, 7, 8(this is obviously simple)
1, 2, 3, 4, 5, 6, 7, 8（这显然很简单）
However, I want the number in the second paragraph to increment by 2 with each loop, e.g...
但是，我希望第二段中的数字随着每个循环增加 2，例如..
1, 3, 5, 7, 9, 11, 13, 15
1, 3, 5, 7, 9, 11, 13, 15
I can't figure out how to make the number in the second paragraph increment by 2 with each loop. If I change it to $n++ then it increments by 2, but it then makes the loop run only 4 times instead of 8.
我不知道如何在每个循环中使第二段中的数字增加 2。如果我将其更改为 $n++，则它会增加 2，但它只会使循环运行 4 次而不是 8 次。
Any help would be much appreciated. Thanks!
任何帮助将非常感激。谢谢！
采纳答案by Legionar
<?php
for ($n = 0; $n <= 7; $n++) {
echo '<p>'.($n + 1).'</p>';
echo '<p>'.($n * 2 + 1).'</p>';
}
?>
First paragraph:
第一段：
1, 2, 3, 4, 5, 6, 7, 8
Second paragraph:
第二段：
1, 3, 5, 7, 9, 11, 13, 15
回答by AntonioAvp
You should do it like this:
你应该这样做：
for ($i=1; $i <=10; $i+=2)
{
echo $i.'<br>';
}
"+=" you can increase your variable as much or less you want. "$i+=5" or "$i+=.5"
"+=" 您可以根据需要增加或减少变量。"$i+=5" 或 "$i+=.5"
回答by Manolo
You should use other variable:
您应该使用其他变量：
$m=0;
for($n=1; $n<=8; $n++):
$n = $n + $m;
$m++;
echo '<p>'. $n .'</p>';
endfor;
回答by Oladimeji Ajeniya
Simple solution
简单的解决方案
<?php
$x = 1;
for($x = 1; $x < 8; $x++) {
$x = $x + 1;
echo $x;
};
?>
回答by Manuel
Another simple solution with +=:
另一个简单的解决方案+=：
$y = 1;
for ($x = $y; $x <= 15; $y++) {
printf("The number of first paragraph is: $y <br>");
printf("The number of second paragraph is: $x+=2 <br>");
}
回答by user2963963
<?php
$x = 1;
for($x = 1; $x < 8; $x++) {
$x = $x + 2;
echo $x;
};
?>
