PHP- Decode JSON - PHP- Decode JSON

我有以下脚本从 API 获取搜索结果，然后切片数组并转储它，我在将 JSON 解码为数组时遇到问题，它返回Array(0) { }这是一个文字新闻简码

下面是从 API 获取的 Json 示例：

[
  {
    "barcode": "000015426950",
    "name": "Karen's cowboy",
    "author": "Ann",
    "author_last": "Martin",
    "publisher": "New York : Scholastic, c2000.",
    "year_pub": "",
    "edition": "",
    "genre": "",
    "checkout": "out",
    "series": "",
    "callnum": "MAR",
    "fiction": "true",
    "in_house": "false",
    "timestamp": "1355835387",
    "outto": "000008388615",
    "duedate": "1372005722",
    "ISBN": "059052528X",
    "media_type": "",
    "print": "false",
    "BOXID": "2147483647",
    "uid": "10",
    "printed": ""
  },
  {
    "barcode": "000015426949",
    "name": "Karen's yo-yo",
    "author": "Ann M",
    "author_last": "Martin",
    "publisher": "New York : Scholastic, c2000.",
    "year_pub": "",
    "edition": "",
    "genre": "",
    "checkout": "out",
    "series": "",
    "callnum": "MAR",
    "fiction": "true",
    "in_house": "false",
    "timestamp": "1355835343",
    "outto": "000008388615",
    "duedate": "1373216918",
    "ISBN": "0590525115",
    "media_type": "",
    "print": "false",
    "BOXID": "",
    "uid": "10",
    "printed": ""
  },
...
  }
]

以下是用于获取 JSON 并对其进行分页的代码：

function book_search_form() {
?>
<form method='get'><input type='text' name='searchvalue' value='<? if (isset($_GET['searchvalue'])) echo $_GET['searchvalue'];?>' />&nbsp;<input type='submit' value='Search' /><input type='hidden' name='pagenum' value='1' /></form>
<br>
<?php 
if(isset($_GET['pagenum']) && isset($_GET['searchvalue']))
{
$page=$_GET['pagenum'];
$searchvalue = $_GET['searchvalue'];   // get the value of the page from your url
$recordsPerPage=10; // number of records you want on your page
$api_url = get_option('api_url');
    $api_key = get_option('api_key');
    $data = file_get_contents("$api_url/book/index.php/name/$searchvalue?key=2513619352");
    $array = (array)json_decode($data);
$index=($page*$recordsPerPage)-1;
$recordsToBeDisplayed = array_slice($array,$index,$recordsPerPage);// this array contains all the records you would want to display on a page;

    $total_pages=ceil(count($array)/$recordsPerPage);
    }
else { 
//use default values
}
?>
<html>...<body><div id="records">
<?
echo '<pre>';
echo $recordsToBeDisplayed;
echo '</pre>';?><!-- use the array created above to display records -->
    </div>
<div id="pagination">
<?
for($j=1;$j<=$total_pages;$j++){
                    if($j==$page)
                   {?>
                   <li style="display: inline;"><a href="?searchvalue=&pagenum=<?=$j?>"><u><?=$j?></u></a></li>
                   <?}else{?>
                        <li style="display: inline;"><a href="?searchvalue=&pagenum=<?=$j?>"><?=$j?></a></li>

                   <?}}?>
</div>
<?php

}

尝试json_decode

$array = json_decode($data, true);

然后你会得到一个数组而不是一个对象。

示例 #1 json_decode（）示例

<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>

上面的示例将输出：

object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}
array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

请将您的 php 与 html 分开，使用缩进和：

$array = json_decode($data, TRUE); //second param used for associative array return
Example #1 json_decode() examples
<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>
The above example will output:
object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}
array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
}

附言：来自圣经（http://php.net/manual/en/function.json-decode.php）

如果输入是数组格式，那么您也可以使用相同的函数json_decode。您只需要为结果应用循环。

JSON = '{
"
a1"：{ "字段1"："名称1"， "字段2"：年龄1， "字段3"："国家/地区1" }，
"
a2"：{ "字段 1"："名称 2"， "字段 2"：年龄 2， "字段 3"："国家/地区 2" }，
"
a3"：{ "field1"："name3"， "field2"：age3， "field3"："country3" } }';
$Array = json_decode（$json， true）;
foreach （$Array as $key => $value）
{
    echo " $key ";
    foreach ($value as $k => $val)    
    {
        echo "$k | $val <br />";
    } 
}