json_decode是php5.2.0之后新增的一个PHP内置函数,其作用是对JSON格式的字符串进行编码.那么这个函数该如何使用呢?文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
json_decode的语法规则: json_decode ( string $json [, bool $assoc = false [, int $depth = 512 [, int $options = 0 ]]] )
文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
json_decode接受一个JSON格式的字符串并且把它转换为PHP变量 ,当该参数$assoc为TRUE时,将返回array,否则返回object。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
JSON 格式的字符串文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
$json = '{"a":"php","b":"mysql","c":3}';文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
其中a为键,php为a的键值。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
实例:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
<?php
$json = '{"a":"php","b":"mysql","c":3}';
$json_Class=json_decode($json);
$json_Array=json_decode($json, true);
print_r($json_Class);
print_r($json_Array);
?>
程序输出:文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
stdClass Object (
[a] => php
[b] => mysql
[c] => 3 )
Array (
[a] => php
[b] => mysql
[c] => 3 )文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
在上面代码的前提下访问对象类型$json_Class的a的值文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
echo $json_Class->{'a'};
程序输出:php文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
访问数组类型$json_Array的a的值文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html
echo $json_Array['a'];
程序输出:php文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24997.html