嗨，大家好，数据库中的传单没有集成错误代码：致命错误

Question

大家好，数据库中的传单没有集成错误代码：致命错误

我已经尽力解决了，希望您能帮上忙。

首先，我将共享错误代码，然后将共享html和php代码。

VM217：1未捕获的SyntaxError：JSON中位置0上的意外令牌<

at JSON.parse (<anonymous>)

at Object.success ((index):71)

at c (jquery-3.4.1.min.js:2)

at Object.fireWith [as resolveWith] (jquery-3.4.1.min.js:2)

at l (jquery-3.4.1.min.js:2)

at XMLHttpRequest.<anonymous> (jquery-3.4.1.min.js:2)

致命错误 ：

未捕获的错误：在C：\\ xampp \\ htdocs \\ webmap101 \\ load_attractions.php：5中的bool上调用成员函数fetch（）

堆栈跟踪：

#0 {main}

在第5行的C：\\ xampp \\ htdocs \\ webmap101 \\ load_attractions.php中抛出

HTML代码，JAVASCRİPT。

        var lyrAttractions;

        $.ajax({url:'load_attractions.php', success: function(response){

              if (lyrAttractions) {mymap.removeLayer(lyrAttractions)};

              lyrAttractions=L.geoJSON(JSON.parse(response), {pointToLayer: function(feature, latlng) {

        var str = "<button id='zoomTo"+feature.properties.name.replace(/ /g, '');

        str += "' class='form-control btn btn-primary attraction'>";

        str += feature.properties.name+"</button>";

        $("#side_panel").append(str);



        $("#zoomTo"+feature.properties.name.replace(/ /g, '')).click(function() {

        mymap.setView([latlng.lat, latlng.lng], 17);

        });

        var str = "<h4>"+feature.properties.name+"</h4><hr>";

        str += "<a href='"+feature.properties.web+"'target='blank'>";

        str +="<img src='img/"+feature.properties.image+"' width='200px'>";

        str += "</a>";

        return L.marker(latlng).bindPopup(str);

        }});

        lyrAttractions.addTo(mymap);

        mymap.fitBounds(lyrAttractions.getBounds());

        }});

PHP代码

<?php

$db = new PDO("pgsql:host=localhost;port=5432;dbname=webmap101;","postgres","22222222");

$sql = $db->query("SELECT id, name, image, web, category, ST_AsGeoJSON(geom,5) as geom FROM cdmx_attractions ORDER BY name");

$features=[];

while ($row = $sql->fetch(PDO::FETCH_ASSOC)) {

$feature=['type'=>'Feature'];

$feature['geometry']=$json_decode($row['geom']);

unset($row['geom']);

      $feature['properties']=$row;

    array_push($features, $feature);

}

$featureCollection=['type'=>'FeatureCollection', 'features'=>$features];

echo json_encode($featureCollection);

?>