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[运维] Linux下给PHP安装amqp扩展

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呵呵燕的头像 楼主
发表于 2016-10-3 17:05:01 | 显示全部楼层 |阅读模式
  json_decode对JSON格式的字符串进行编码而json_encode对变量进行 JSON 编码,需要的朋友可以参考下。

  1.json_decode()

  json_decode

  (PHP 5 >= 5.2.0, PECL json >= 1.2.0)

  json_decode — 对 JSON 格式的字符串进行编码

  说明

  mixed json_decode ( string $json [, bool $assoc ] )

  接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

  参数

  json

  待解码的 json string 格式的字符串。

  assoc

  当该参数为 TRUE 时,将返回 array 而非 object 。

  返回值

  Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.

  范例

  Example #1 json_decode() 的例子

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

  1.   object(stdClass)#1 (5) {

  2.   ["a"] => int(1)

  3.   ["b"] => int(2)

  4.   ["c"] => int(3)

  5.   ["d"] => int(4)

  6.   ["e"] => int(5)

  7.   }

  8.   array(5) {

  9.   ["a"] => int(1)

  10.   ["b"] => int(2)

  11.   ["c"] => int(3)

  12.   ["d"] => int(4)

  13.   ["e"] => int(5)

  14.   }

  15.   $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]';

  16.   echo json_decode($data);
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  结果为:

 
  1.  Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )
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  可以看出经过json_decode()编译出来的是对象,现在输出json_decode($data,true)试下

  
  1. echo json_decode($data,true);
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  结果:

  
  1. Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )
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  可以看出 json_decode($data,true)输出的一个关联数组,由此可知json_decode($data)输出的是对象,而json_decode(“$arr”,true)是把它强制生成PHP关联数组.

  2.json_encode()

  json_encode

  (PHP 5 >= 5.2.0, PECL json >= 1.2.0)

  json_encode — 对变量进行 JSON 编码

  Report a bug 说明

  string json_encode ( mixed $value [, int $options = 0 ] )

  返回 value 值的 JSON 形式

  Report a bug 参数

  value

  待编码的 value ,除了resource 类型之外,可以为任何数据类型

  该函数只能接受 UTF-8 编码的数据

  options

  由以下常量组成的二进制掩码: JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT, JSON_UNESCAPED_UNICODE.

  Report a bug 返回值

  编码成功则返回一个以 JSON 形式表示的 string 或者在失败时返回 FALSE 。

  Report a bug 更新日志

  版本 说明

  5.4.0 options 参数增加常量: JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, 和 JSON_UNESCAPED_UNICODE。

  5.3.3 options 参数增加常量:JSON_NUMERIC_CHECK。

  5.3.0 增加 options 参数.

  Report a bug 范例

  Example #1 A json_encode() 的例子

  1. <?php
  2. $arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);

  3. echo json_encode($arr);
  4. ?>
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  以上例程会输出:

 
  1.  {"a":1,"b":2,"c":3,"d":4,"e":5}
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  Example #2 json_encode() 函数中 options 参数的用法

  1.   $a = array('',"'bar'",'"baz"','&blong&', "\xc3\xa9");

  2.   echo "Normal: ", json_encode($a), "\n";

  3.   echo "Tags: ", json_encode($a, JSON_HEX_TAG), "\n";

  4.   echo "Apos: ", json_encode($a, JSON_HEX_APOS), "\n";

  5.   echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "\n";

  6.   echo "Amp: ", json_encode($a, JSON_HEX_AMP), "\n";

  7.   echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "\n";

  8.   echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "\n\n";

  9.   $b = array();

  10.   echo "Empty array output as array: ", json_encode($b), "\n";

  11.   echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "\n\n";

  12.   $c = array(array(1,2,3));

  13.   echo "Non-associative array output as array: ", json_encode($c), "\n";

  14.   echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "\n\n";

  15.   $d = array('foo' => 'bar', 'baz' => 'long');

  16.   echo "Associative array always output as object: ", json_encode($d), "\n";

  17.   echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "\n\n";

  18.   ?>
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  以上例程会输出:

  1.   Normal: ["","'bar'","\"baz\"","&blong&","\u00e9"]

  2.   Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&","\u00e9"]

  3.   Apos: ["","\u0027bar\u0027","\"baz\"","&blong&","\u00e9"]

  4.   Quot: ["","'bar'","\u0022baz\u0022","&blong&","\u00e9"]

  5.   Amp: ["","'bar'","\"baz\"","\u0026blong\u0026","\u00e9"]

  6.   Unicode: ["","'bar'","\"baz\"","&blong&","é"]

  7.   All: ["\u003Cfoo\u003E","\u0027bar\u0027","\u0022baz\u0022","\u0026blong\u0026","é"]

  8.   Empty array output as array: []

  9.   Empty array output as object: {}

  10.   Non-associative array output as array: [[1,2,3]]

  11.   Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}}

  12.   Associative array always output as object: {"foo":"bar","baz":"long"}

  13.   Associative array always output as object: {"foo":"bar","baz":"long"}
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  Example #3 连续与非连续数组示例

  1.   echo "连续数组".PHP_EOL;

  2.   $sequential = array("foo", "bar", "baz", "blong");

  3.   var_dump(

  4.   $sequential,

  5.   json_encode($sequential)

  6.   );

  7.   echo PHP_EOL."非连续数组".PHP_EOL;

  8.   $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong");

  9.   var_dump(

  10.   $nonsequential,

  11.   json_encode($nonsequential)

  12.   );

  13.   echo PHP_EOL."删除一个连续数组值的方式产生的非连续数组".PHP_EOL;

  14.   unset($sequential[1]);

  15.   var_dump(

  16.   $sequential,

  17.   json_encode($sequential)

  18.   );

  19.   ?>
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  以上例程会输出:

  连续数组

  1.   array(4) {

  2.   [0]=>

  3.   string(3) "foo"

  4.   [1]=>

  5.   string(3) "bar"

  6.   [2]=>

  7.   string(3) "baz"

  8.   [3]=>

  9.   string(5) "blong"

  10.   }

  11.   string(27) "["foo","bar","baz","blong"]"
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  非连续数组

  1.   array(4) {

  2.   [1]=>

  3.   string(3) "foo"

  4.   [2]=>

  5.   string(3) "bar"

  6.   [3]=>

  7.   string(3) "baz"

  8.   [4]=>

  9.   string(5) "blong"

  10.   }

  11.   string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}"
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  删除一个连续数组值的方式产生的非连续数组

  
  1. array(3) {

  2.   [0]=>

  3.   string(3) "foo"

  4.   [2]=>

  5.   string(3) "baz"

  6.   [3]=>

  7.   string(5) "blong"

  8.   }

  9.   string(33) "{"0":"foo","2":"baz","3":"blong"}"
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  1. $obj->Name= 'a1';$obj->Number ='123';

  2.   $obj->Contno= '000';

  3.   echo json_encode($obj);
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  结果为:

  1.   {"Name":"a1",

  2.   "Number":"123",

  3.   "Contno":"000"

  4.   }
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  可以看出json_encode()和json_decode()是编译和反编译过程,注意json只接受utf-8编码的字符,所以json_encode()的参数必须是utf-8编码,否则会得到空字符或者null。

原文作者:佚名  来源:开发者头条

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