有没有办法从包含 PHP 中的 json 数组的 URL 中提取数据

Question

我有这个网址http://bisscloud.britain.edu.pk:8841/BISSJSon/JSonStudentsAll.aspx 其中包含 json 数组形式的数据，我想使用 php 提取数据，我尝试使用 file_get_contents

<?php
error_reporting(E_ALL);
$file = file_get_contents("http://bisscloud.britain.edu.pk:8841/BISSJSon/JSonStudentsAll.aspx");
$data = json_decode($file);
var_dump($data);

?>   

但它返回 null 我也尝试使用 CURL 但没有结果

Answer 1

响应为 6.9 MB，包含 9767 条学生记录，这可能是大多数人响应超时的原因，服务器可能很难生成响应。如果您确实设法获得响应并尝试对其进行解码，json_decode 将返回 null，因为它无法解码 JSON。如果你使用JSON_THROW_ON_ERROR标志，或者检查json_last_error，你会发现JSON中有语法错误。

问题是有两条记录包含双反斜杠。反斜杠是 JSON 中的特殊字符，文字反斜杠必须使用...另一个反斜杠进行转义。所以在这两个元素中，\\ 需要是\\\\

{
      "StudentID": "10095",
      "RegistrationNo": "10078",
      "AdmissionDate": "01 Nov 2017",
      "StudentName": "Aaniya Tariq",
      "FatherName": "Tariq Shehzad",
      "Gender": "Female",
      "HomeAddress": "\\House No. 231-Block-H2, Johar Town",
      "HomePhone": "0324-4514622",
      "EmergencyPhone": "03064142718",
      "DateOfBirth": "24 Sep 2012",
      "ContactNo": "0324-4514622 ; 03064142718",
      "FamilyNo": "03064142718",
      "WebPassword": null,
      "CampusName": "Al-Muqeet Campus",
      "SessionYear": "2020-2021",
      "ClassTitle": "Level-III",
      "SectionTitle": "Green",
      "CampusID": "31",
      "SessionID": "12",
      "ClassID": "6",
      "SectionID": "1"
    },
    {
      "StudentID": "15929",
      "RegistrationNo": "15912",
      "AdmissionDate": "12 Oct 2020",
      "StudentName": "Fatima Tu Zahra \\ waseem Hashmi",
      "FatherName": "M. Waseem Hassan Hashmi",
      "Gender": "Female",
      "HomeAddress": "Punjab small Industries, Rawwal Road, Multan",
      "HomePhone": "N/A",
      "EmergencyPhone": "033152701010",
      "DateOfBirth": "16 Jan 2008",
      "ContactNo": "N/A ; 033152701010",
      "FamilyNo": "033152701010",
      "WebPassword": null,
      "CampusName": "Al-Awwal Campus",
      "SessionYear": "2020-2021",
      "ClassTitle": "Level-VIII",
      "SectionTitle": "Green",
      "CampusID": "9",
      "SessionID": "12",
      "ClassID": "11",
      "SectionID": "1"
    }

修复这两个语法错误让我能够解码 JSON 字符串。

$file = file_get_contents("http://bisscloud.britain.edu.pk:8841/BISSJSon/JSonStudentsAll.aspx");

try
{
    $data = json_decode($file, true, 512, JSON_THROW_ON_ERROR);
    echo sizeof($data['Students']) . PHP_EOL;
    var_dump($data);
}
catch (JsonException $e)
{
    echo 'Error code: '.$e->getCode().PHP_EOL;
    echo $e->getMessage().PHP_EOL;
}