php - PHP 中爆炸为数组

Question

我正在处理这个程序，这里我试图用','分隔字符串电子邮件，然后我将其存储在数组中，然后在foreach中附加'city'..

$email='aa,bb,cc,dd';
$a=explode(',',$email);
//echo $a[2];
$result="";
foreach($a as $v)
{
     $result .= " city = '$v' ";
     echo $result;
}

我得到的结果是

city = 'aa' city = 'aa' city = 'bb' city = 'aa' city = 'bb' city = 'cc' city = 'aa' city = 'bb' city = 'cc' city = 'dd'

但我希望它是，，

city = 'aa' city = 'bb' city = 'cc' city = 'dd' 

我的代码有错吗？..请指导我..

Answer 1

将 echo 移出循环，因为您正在循环中构建整个字符串，这每次都会回显该字符串。

$result="";
foreach($a as $v)
{
     $result .= " city = '$v' ";

}

     echo $result;  // move it here