我正在从PHP输出一些JSON，但是我很难理解如何做嵌套数组（至少我认为这就是所谓的）
例如，我可以输出单个集合，"type": "Feature"但是我该怎么办
"geometry": {
"type": "Point",
"coordinates": [-77.03238901390978,38.913188059745586]
},
例如，JSON数组中一项的所需输出可能是：
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [-77.03238901390978,38.913188059745586]
},
"properties": {
"title": "Mapbox DC",
"description": "1714 14th St NW, Washington DC",
"marker-color": "#fc4353",
"marker-size": "large",
"marker-symbol": "monument"
}
},
到目前为止，我的代码如下所示：
<?php
$projects = $pages->find('template=project-detail, sort=sort');
$projects_array = array();
foreach ($projects as $project) {
$title = $project->title;
$long = $project->project_location_marker_long;
$lat = $project->project_location_marker_lat;
$projects_array[] = array(
'title' => $title
);
}
$projects_json = json_encode($projects_array, true);
?>
<script>
var geojson = <?php echo echo $projects_json; ?>
</script>
生成如下内容：
[{
"title": "Steel Strike 1980"
}, {
"title": "Chapel Flat Dyke Boat"
}]
嵌套数组很容易创建。这是一个例子：
$my_array = array(
'string_example' => 'asdf',
'integer_example' => 42,
'array_example' => array() // this array is nested
);
在这个嵌套数组中，您可以放置任何想要的东西。例如，让我们把完全一样的东西放进去：
$my_array = array(
'string_example' => 'asdf',
'integer_example' => 42,
'array_example' => array(
'string_example' => 'asdf',
'integer_example' => 42,
'array_example' => array()
)
);
因此，从您的代码示例开始，鉴于您包括的数据，这是一个开始：
foreach ($projects as $project) {
$title = $project->title;
$long = $project->project_location_marker_long;
$lat = $project->project_location_marker_lat;
$projects_array[] = array(
'geometry' => array(
'coordinates' => array($long, $lat)
)
'properties' => array(
'title' => $title
)
);
}
编码后将产生以下json：
{
"geometry": {
"coordinates": [-77.03238901390978,38.913188059745586]
},
"properties": {
"title": "Mapbox DC",
}
}
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