我试图创建一个包含100个项目的单个数组。 第一个for循环运行10次,每次运行它运行另一个for循环,将10个项目插入到数组中。
但结果只是最后10项:
class Feed {
public $url;
public $title;
}
function feeds_array() {
for ($x = 0; $x <= 10; $x++) {
$feeds = feed($x);
}
return $feeds;
}
function feed($x) {
for ($i = 1; $i <= 10; $i++) {
$feed = new Feed();
$feed->url = "u" . $x;
$feed->title = "t" . $i;
$feeds[] = $feed;
}
return $feeds;
}
$feeds = feeds_array();
foreach ($feeds as $feed) {
echo 'This feed is a ' . $feed->url . ' ' . $feed->title;
echo "<br>";
}
答案 0 :(得分:2)
$feeds[] = feed($x);
您正在重新分配$feeds
而不是插入其中。
顺便说一句,你应该在使用之前声明$feeds
:
function feeds_array(){
$feeds = array();
for ($x = 0; $x < 10; $x++){
$feeds[] = feed($x);
}
return $feeds;
}
而且,作为重写,你实际上迭代了11次($x <= 10
)。我想你只想要$x < 10
(给你从0索引开始)。
工作代码:
// original feed object
class Feed
{
public $url;
public $title;
}
// root method to create an array of arrays
function feeds_array(){
// create a variable we're going to be assigning to
$feeds = array();
// iterate ten times
for ($x = 0; $x < 10; $x++){
// merge/combine the array we're generating with feed() in to
// our current `$feed` array.
$feeds = array_merge($feeds, feed($x));
}
// return result
return $feeds;
}
// nested function to create and return an array
function feed($x){
// again, initialize our resulting variable
$feeds = array();
// iterate over it 10 times
for ($y = 0; $y < 10; $y++){
// create the new object
$feed = new Feed();
$feed->url = 'u' . $x;
$feed->title = 't' . $y;
// push it in to the result
$feeds[] = $feed;
}
// return the result
return $feeds;
}
// entry point
$feeds = feeds_array();
var_dump($feeds);