我是PHP新手.我的问题是,当我使用以下脚本时:
$arr1 = array('fname' => 'niraj','lname' => 'kaushal','city' => 'lucknow');
while(list($key, $value) = each($arr1)){
echo "$key has $value value <br>";
}
foreach($arr1 as $key => $value){
echo "$key:$value <br>";
}
它输出
fname has niraj value
lname has kaushal value
city has lucknow value
fname:niraj
lname:kaushal
city:lucknow
但是当我改变foreach和while循环的顺序如下
$arr1 = array('fname' => 'niraj','lname' => 'kaushal','city' => 'lucknow');
foreach($arr1 as $key => $value){
echo "$key:$value <br>";
}
while(list($key, $value) = each($arr1)){
echo "$key has $value value <br>";
}
它给出了以下输出
fname:niraj
lname:kaushal
city:lucknow …编写一个函数，它接受一个参数，即一个数字数组，并返回一个数组，该数组只包含输入数组中的偶数数字。