获得一个字符串的一部分在PHP

Question

具有以下字符串：

"[{"name":null,"value":"","target":null,"alias":"","required":1,"showNull":0}]" 

我怎样才能从required部分1？我只需要1。

在此先感谢。

Answer 1

假设这个字符串永远是JSON，使用json_decode()：

$array = json_decode('[{"name":null,"value":"","target":null,"alias":"","required":1,"showNull":0}]'); 

现在，您可以按如下方式访问required选项：

$array[0]->required; 

Answer 2

您可以使用json_decode：

<?php 
$string = '[{"name":null,"value":"","target":null,"alias":"","required":1,"showNull":0}]'; 
$string_array = json_decode($string, true); 
echo $string_array[0]['required']; 
?> 

Answer 3

单行使用功能json_decode和current：

$str = '[{"name":null,"value":"","target":null,"alias":"","required":1,"showNull":0}]'; 
$required = current(json_decode($str))->required;