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decode对JSON格式的字符串进行编码而json

发布时间:2020-04-21 15:56编辑:威尼斯在线注册平台浏览(143)

    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() 

    1.json_decode()

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

    php中json_decode()和json_encode()

    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 

    1.json_decode()

    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 

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

    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_decode — 对 JSON 格式的字符串进行编码

    参数

    json 
    待解码的 json string 格式的字符串。 

    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

    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 。 

    参数

    assoc
    当该参数为 TRUE 时,将返回 array 而非 object 。

    2.json_encode() 

    json
    待解码的 json string 格式的字符串。

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

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

    assoc
    当该参数为 TRUE 时,将返回 array 而非 object 。

    范例

    json_encode — 对变量进行 JSON 编码 

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

    Example #1 json_decode() 的例子

    Report a bug 说明 
    string json_encode ( mixed $value [, int $options = 0 ] ) 
    返回 value 值的 JSON 形式 

    范例

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

    Report a bug 参数 

    Example #1 json_decode() 的例子

    上例将输出:

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

     代码如下

    object(stdClass)#1 (5) { 
    ["a"] => int(1) 
    ["b"] => int(2) 
    ["c"] => int(3) 
    ["d"] => int(4) 
    ["e"] => int(5) 
    } 
    
    array(5) { 
    ["a"] => int(1) 
    ["b"] => int(2) 
    ["c"] => int(3) 
    ["d"] => int(4) 
    ["e"] => int(5) 
    }
    
    $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]'; 
    echo json_decode($data);
    

    该函数只能接受 UTF-8 编码的数据 

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

    结果为:

    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. 

    上例将输出:

    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] => ) )
    

    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 。 

    object(stdClass)#1 (5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
    }

    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

    文章由爱资料原创本文地址:

    array(5) {
    ["a"] => int(1)
    ["b"] => int(2)
    ["c"] => int(3)
    ["d"] => int(4)
    ["e"] => int(5)
    }

    echo json_decode($data,true);
    

    $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]';
    echo json_decode($data);

    结果:

    结果为:

    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] => ) )
    

    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] => ) )

    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.

    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

    2.json_encode()

     代码如下

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

    echo json_decode($data,true);

    json_encode — 对变量进行 JSON 编码

    结果:

    Report a bug 说明
    string json_encode ( mixed $value [, int $options = 0 ] )
    返回 value 值的 JSON 形式

    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] => ) )

    Report a bug 参数

    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.

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

    2.json_encode()

    该函数只能接受 UTF-8 编码的数据

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

    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.

    json_encode — 对变量进行 JSON 编码

    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 说明
    string json_encode ( mixed $value [, int $options = 0 ] )
    返回 value 值的 JSON 形式

    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 参数

    Report a bug 范例

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

    Example #1 A json_encode() 的例子

    该函数只能接受 UTF-8 编码的数据

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

    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.

    以上例程会输出:

    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 。

    {"a":1,"b":2,"c":3,"d":4,"e":5}
    

    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.

    Example #2 json_encode() 函数中 options 参数的用法

    Report a bug 范例

    <?php 
    $a = array('<foo>',"'bar'",'"baz"','&blong&', "xc3xa9"); 
    
    echo "Normal: ", json_encode($a), "n"; 
    echo "Tags: ", json_encode($a, JSON_HEX_TAG), "n"; 
    echo "Apos: ", json_encode($a, JSON_HEX_APOS), "n"; 
    echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "n"; 
    echo "Amp: ", json_encode($a, JSON_HEX_AMP), "n"; 
    echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "n"; 
    echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "nn"; 
    
    $b = array(); 
    
    echo "Empty array output as array: ", json_encode($b), "n"; 
    echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "nn"; 
    
    $c = array(array(1,2,3)); 
    
    echo "Non-associative array output as array: ", json_encode($c), "n"; 
    echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "nn"; 
    
    $d = array('foo' => 'bar', 'baz' => 'long'); 
    
    echo "Associative array always output as object: ", json_encode($d), "n"; 
    echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "nn"; 
    ?>
    

    Example #1 A json_encode() 的例子

    以上例程会输出:

     代码如下

    Normal: ["<foo>","'bar'",""baz"","&blong&","u00e9"] 
    Tags: ["u003Cfoou003E","'bar'",""baz"","&blong&","u00e9"] 
    Apos: ["<foo>","u0027baru0027",""baz"","&blong&","u00e9"] 
    Quot: ["<foo>","'bar'","u0022bazu0022","&blong&","u00e9"] 
    Amp: ["<foo>","'bar'",""baz"","u0026blongu0026","u00e9"] 
    Unicode: ["<foo>","'bar'",""baz"","&blong&","é"] 
    All: ["u003Cfoou003E","u0027baru0027","u0022bazu0022","u0026blongu0026","é"] 
    
    Empty array output as array: [] 
    Empty array output as object: {} 
    
    Non-associative array output as array: [[1,2,3]] 
    Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}} 
    
    Associative array always output as object: {"foo":"bar","baz":"long"} 
    Associative array always output as object: {"foo":"bar","baz":"long"}
    

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

    Example #3 连续与非连续数组示例

    echo json_encode($arr);
    ?>

    <?php 
    echo "连续数组".PHP_EOL; 
    $sequential = array("foo", "bar", "baz", "blong"); 
    var_dump( 
    $sequential, 
    json_encode($sequential) 
    ); 
    
    echo PHP_EOL."非连续数组".PHP_EOL; 
    $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong"); 
    var_dump( 
    $nonsequential, 
    json_encode($nonsequential) 
    ); 
    
    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; 
    unset($sequential[1]); 
    var_dump( 
    $sequential, 
    json_encode($sequential) 
    ); 
    ?>
    

    以上例程会输出:

    以上例程会输出:

    {"a":1,"b":2,"c":3,"d":4,"e":5}

    连续数组 
    array(4) { 
    [0]=> 
    string(3) "foo" 
    [1]=> 
    string(3) "bar" 
    [2]=> 
    string(3) "baz" 
    [3]=> 
    string(5) "blong" 
    } 
    string(27) "["foo","bar","baz","blong"]" 
    
    非连续数组 
    array(4) { 
    [1]=> 
    string(3) "foo" 
    [2]=> 
    string(3) "bar" 
    [3]=> 
    string(3) "baz" 
    [4]=> 
    string(5) "blong" 
    } 
    string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}" 
    
    删除一个连续数组值的方式产生的非连续数组 
    array(3) { 
    [0]=> 
    string(3) "foo" 
    [2]=> 
    string(3) "baz" 
    [3]=> 
    string(5) "blong" 
    } 
    string(33) "{"0":"foo","2":"baz","3":"blong"}"
    
    $obj->Name= 'a1';$obj->Number ='123'; 
    $obj->Contno= '000'; 
    echo json_encode($obj);
    

    Example #2 json_encode() 函数中 options 参数的用法

    结果为:

    <?php
    $a = array('<foo>',"'bar'",'"baz"','&blong&', "xc3xa9");

    {"Name":"a1", 
    "Number":"123", 
    "Contno":"000" 
    }
    

    echo "Normal: ", json_encode($a), "n";
    echo "Tags: ", json_encode($a, JSON_HEX_TAG), "n";
    echo "Apos: ", json_encode($a, JSON_HEX_APOS), "n";
    echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "n";
    echo "Amp: ", json_encode($a, JSON_HEX_AMP), "n";
    echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "n";
    echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "nn";

    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。

    $b = array();

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

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

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

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

    echo "Associative array always output as object: ", json_encode($d), "n";
    echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "nn";
    ?>

    以上例程会输出:

    Normal: ["<foo>","'bar'",""baz"","&blong&","u00e9"]
    Tags: ["u003Cfoou003E","'bar'",""baz"","&blong&","u00e9"]
    Apos: ["<foo>","u0027baru0027",""baz"","&blong&","u00e9"]
    Quot: ["<foo>","'bar'","u0022bazu0022","&blong&","u00e9"]
    Amp: ["<foo>","'bar'",""baz"","u0026blongu0026","u00e9"]
    Unicode: ["<foo>","'bar'",""baz"","&blong&","é"]
    All: ["u003Cfoou003E","u0027baru0027","u0022bazu0022","u0026blongu0026","é"]

    Empty array output as array: []
    Empty array output as object: {}

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

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

    Example #3 连续与非连续数组示例

     代码如下

    <?php
    echo "连续数组".PHP_EOL;
    $sequential = array("foo", "bar", "baz", "blong");
    var_dump(
    $sequential,
    json_encode($sequential)
    );

    echo PHP_EOL."非连续数组".PHP_EOL;
    $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong");
    var_dump(
    $nonsequential,
    json_encode($nonsequential)
    );

    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;
    unset($sequential[1]);
    var_dump(
    $sequential,
    json_encode($sequential)
    );
    ?>

    以上例程会输出:

     代码如下

    连续数组
    array(4) {
    [0]=>
    string(3) "foo"
    [1]=>
    string(3) "bar"
    [2]=>
    string(3) "baz"
    [3]=>
    string(5) "blong"
    }
    string(27) "["foo","bar","baz","blong"]"

    非连续数组
    array(4) {
    [1]=>
    string(3) "foo"
    [2]=>
    string(3) "bar"
    [3]=>
    string(3) "baz"
    [4]=>
    string(5) "blong"
    }
    string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}"

    删除一个连续数组值的方式产生的非连续数组
    array(3) {
    [0]=>
    string(3) "foo"
    [2]=>
    string(3) "baz"
    [3]=>
    string(5) "blong"
    }
    string(33) "{"0":"foo","2":"baz","3":"blong"}"

    $obj->Name= 'a1';$obj->Number ='123';
    $obj->Contno= '000';
    echo json_encode($obj);

    结果为:

    {"Name":"a1",
    "Number":"123",
    "Contno":"000"
    }

    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

    如果是中文的话就要注意了

    在网上找到一种解决方法:

     代码如下

    <?php
    /* 处理json_encode中文乱码 */
    $data = array ('game' => '冰火国度', 'name' => '刺之灵', 'country' => '冰霜国', 'level' => 45 );
    echo json_encode ( $data );
    echo "<br>";
    $newData = array ();
    foreach ( $data as $key => $value ) {
    $newData [$key] = urlencode ( $value );
    }
    echo urldecode ( json_encode ( $newData ) );
    ?>

    后来请教了别人,还可以用base64编码,不过base64编码不可以放在URL中,百度是这样解释的:

    标准的Base64并不适合直接放在URL里传输,因为URL编码器会把标准Base64中的“/”和“+”字符变为形如“%XX”的形式,而这些“%”号在存入数据库时还需要再进行转换,因为ANSI SQL中已将“%”号用作通配符。

    不过我的数据是要通过POST发送的,并不在HTTP 的head中,而在message-body里,所以不受影响。

    json_encode 只能接受utf-8格式的数据

    例如:'胥'经过json_encode处理后变为'u80e5',最终的json中中文部分被替换为unicode编码。我们要解决的就是将对象转换为json并保证对象内部的中文在json中仍然是以正常的中文出现,现在看来只使用json_encode是不能达到目的的。
      我的解决方法:先将类中的中文字段进行url编码(urlencode),然后再对对象进行json编码(jsonencode),最后url解码(urldecode)json,即最终的json,里面的中文依旧是那个中文!
    测试代码如下:

     代码如下

    <?php
    class myClass {
    public $item1 = 1;
    public $item2 = '中文';
    function to_json() {
    //url编码,避免json_encode将中文转为unicode
    $this->item2 = urlencode($this->item2);
    $str_json = json_encode($this);
    //url解码,转完json后将各属性返回,确保对象属性不变
    $this->item2 = urldecode($this->item2);
    return urldecode($str_json);
    }
    }
    $c = new myClass();
    echo json_encode($c);
    echo '<br/>';
    echo $c->to_json();
    echo '<br/>';
    echo json_encode($c);
    echo '<br/>';
    echo json_encode('胥');
    ?>

    程序输出结果:

    {"item1":1,"item2":"u4e2du6587"}
    {"item1":1,"item2":"中文"}
    {"item1":1,"item2":"u4e2du6587"}
    "u80e5"

     

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