JSON在php中搜索并删除？

我有一个包含有值的深JSON对象会话变量$_SESSION["animals"]：再次JSON在php中搜索并删除？

$_SESSION["animals"]='{ 
"0":{"kind":"mammal","name":"Pussy the Cat","weight":"12kg","age":"5"}, 
"1":{"kind":"mammal","name":"Roxy the Dog","weight":"25kg","age":"8"}, 
"2":{"kind":"fish","name":"Piranha the Fish","weight":"1kg","age":"1"}, 
"3":{"kind":"bird","name":"Einstein the Parrot","weight":"0.5kg","age":"4"} 
}';

例如，我想找到与“食人鱼鱼”的行，然后将其删除（和json_encode它，因为它是）。如何做到这一点？我想我需要在json_decode($_SESSION["animals"],true)搜索结果数组，并找到父键删除，但我无论如何被困住。

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2010-05-25 moogeek

json_decode将把JSON对象变成一个由嵌套数组组成的PHP结构。然后你只需要循环他们和你不想要的一个unset。

<?php 
$animals = '{ 
"0":{"kind":"mammal","name":"Pussy the Cat","weight":"12kg","age":"5"}, 
"1":{"kind":"mammal","name":"Roxy the Dog","weight":"25kg","age":"8"}, 
"2":{"kind":"fish","name":"Piranha the Fish","weight":"1kg","age":"1"}, 
"3":{"kind":"bird","name":"Einstein the Parrot","weight":"0.5kg","age":"4"} 
}'; 

$animals = json_decode($animals, true); 
foreach ($animals as $key => $value) { 
    if (in_array('Piranha the Fish', $value)) { 
     unset($animals[$key]); 
    } 
} 
$animals = json_encode($animals); 
?>

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2010-05-25 02:20:51

谢谢！如果我不知道关键的名字，怎么做？ – moogeek 2010-05-25 02:24:43

如果不知道密钥名称，这不是更好的解决方案。 – Sarfraz 2010-05-25 02:26:19

@moogeek：在这种情况下，你的意思是“善良”，“名称”，“体重”和“年龄”？如果你不知道，你需要引入另一层迭代，循环'$ value'并检查每个子值与你的字符串。如果你发现它，'unset（$ animals [$ key]）'会像上面那样工作，然后你就可以跳出循环。我已将此代码添加到我的答案中。 – 2010-05-25 02:38:52

您在JSON中最后一个元素的末尾添加了逗号。删除它并json_decode将返回一个数组。简单地循环，测试字符串，然后在找到时取消设置元素。

如果您需要最终数组重新编制索引，只需将它传递给array_values即可。

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2010-05-25 02:26:01 webbiedave

这个工作对我来说：

#!/usr/bin/env php 
<?php 

    function remove_json_row($json, $field, $to_find) { 

     for($i = 0, $len = count($json); $i < $len; ++$i) { 
      if ($json[$i][$field] === $to_find) { 
       array_splice($json, $i, 1); 
      } 
     } 

     return $json; 
    } 

    $animals = 
'{ 
"0":{"kind":"mammal","name":"Pussy the Cat","weight":"12kg","age":"5"}, 
"1":{"kind":"mammal","name":"Roxy the Dog","weight":"25kg","age":"8"}, 
"2":{"kind":"fish","name":"Piranha the Fish","weight":"1kg","age":"1"}, 
"3":{"kind":"bird","name":"Einstein the Parrot","weight":"0.5kg","age":"4"} 
}'; 

    $decoded = json_decode($animals, true); 

    print_r($decoded); 

    $decoded = remove_json_row($decoded, 'name', 'Piranha the Fish'); 

    print_r($decoded); 

?>

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2010-05-25 02:27:09

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