PHP：如何使用数组索引访问数组元素值
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时间：2020-08-25 03:12:23 来源:igfitidea点击:
PHP: How to access array element values using array-index
提问by Shiv
How to access array element values using array-index?
如何使用数组索引访问数组元素值？
<?
$json = '{
"dynamic":{
"pageCount":"12",
"tableCount":"1"
}
}';
$arr = json_decode($json, true);
echo $arr['dynamic']['pageCount']; // working
echo $arr[0]['pageCount']; // not working
?>
I will not know what is there in 'dynamic', so i want to access pageCount values dynamically?
我不知道“动态”中有什么，所以我想动态访问 pageCount 值？
回答by Tufan Bar?? Y?ld?r?m
array_valuesis function you are looking for
array_values是您正在寻找的函数
Examples:
例子：
<?php
$json = '{
"dynamic":{
"pageCount":"12",
"tableCount":"1"
}
}';
$arr = json_decode($json, true);
echo $arr['dynamic']['pageCount']; // working
$arr = array_values($arr);
echo $arr[0]['pageCount']; // NOW working
?>
回答by Dan Grossman
$arr = json_decode($json, true);
foreach ($arr as $key => $value) {
if (isset($value['pageCount'])) {
//do something with the page count
}
}
If the structure is always a single nested JS object:
如果结构始终是单个嵌套的 JS 对象：
$obj = current($arr);
echo $obj['pageCount'];
