1.json_decode ()
Json_decode
(PHP 5 >= 5.2.0, PECL json >= 1.2.0)
json_decode-strings encoded in JSON format
Description
Mixed Json_decode (String $json [, bool $assoc])
Accepts a JSON-formatted string and converts it to a PHP variable
Parameters
Json
A string in JSON string format to be decoded.
Assoc
When this argument is TRUE, the array is returned instead of object.
return value
Returns an object or if the optional assoc parameter is TRUE, a associative array is instead returned.
Example
Examples of Example #1 Json_decode ()
Copy Code code as follows:
<?php
$json = ' {' A ': 1, "B": 2, "C": 3, "D": 4, "E": 5} ';
Var_dump (Json_decode ($json));
Var_dump (Json_decode ($json, true));
?>
The example above will output:
Copy Code code as follows:
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)
}
Copy Code code as follows:
$data = ' [{' Name]: ' A1 "," Number ":" 123 "," Contno ":" "," qqno ":" "},{" Name ":" A1 "," Number ":" 123 "," Contno ":" "," qqno ":" "},{" "Name": "A1", "Number": "123", "Contno": "V", "qqno": ""}] ';
echo Json_decode ($data);
The results are:
Copy Code code as follows:
Array ([0] => stdClass Object ([Name] => A1 [number] => 123 [Contno] => [qqno] =>) [1] => Stdclas s Object ([name] => A1 [number] => 123 [Contno] => [qqno] =>) [2] => stdClass Object ([name] => a 1 [number] => 123 [Contno] => [qqno] =>))
It can be seen that the object is compiled by Json_decode (), now output Json_decode ($data, true) to try
Copy Code code as follows:
Echo Json_decode ($data, true);
Results:
Copy Code code as follows:
Array ([0] => Array ([name] => A1 [number] => 123 [Contno] => [qqno] =>) [1] => Array ([name] =& Gt A1 [number] => 123 [Contno] => [qqno] =>) [2] => Array ([Name] => A1 [number] => 123 [Contno] => ; [Qqno] =>)
You can see an associative array of Json_decode ($data, true) output, so that Json_decode ($data) output is an object, and Json_decode ("$arr", true) forces it to generate a PHP associative array.
2.json_encode ()
Json_encode
(PHP 5 >= 5.2.0, PECL json >= 1.2.0)
json_encode-JSON encoding of a variable
Statement a bug description
String Json_encode (mixed $value [, int $options = 0])
Returns the JSON form of value values
A bug parameter
Value
The value to be encoded, in addition to the resource type, can be any data type
This function can only accept UTF-8 encoded data
Options
A binary mask consisting of the following constants: 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.
A bug return value
The encoding succeeds by returning a string in the form of JSON or FALSE on failure.
A Bug update log
Version description
5.4.0 Options Parameters Add constants: Json_pretty_print, Json_unescaped_slashes, and Json_unescaped_unicode.
5.3.3 Options parameter Add constant: Json_numeric_check.
5.3.0 add options parameter.
A bug example
Example of Example #1 a Json_encode ()
Copy Code code as follows:
<?php
$arr = Array (' A ' =>1, ' B ' =>2, ' C ' =>3, ' d ' =>4, ' e ' =>5);
echo Json_encode ($arr);
?>
The above routines will output:
Copy Code code as follows:
{"A": 1, "B": 2, "C": 3, "D": 4, "E": 5}
Example #2 The use of the options parameter in the Json_encode () function
Copy Code code as follows:
<?php
$a = Array (' <foo> ', ' bar ', ' baz ', ' &blong& ', ' \xc3\xa9 ');
echo "Normal:", Json_encode ($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), "\ n";
$b = Array ();
echo "Empty array output as array:", Json_encode ($b), "\ n";
echo "Empty array output As Object:", Json_encode ($b, json_force_object), "\ n";
$c = Array (array (1,2,3));
echo "non-associative array output as array:", Json_encode ($c), "\ n";
echo "non-associative array output As Object:", Json_encode ($c, json_force_object), "\ n";
$d = Array (' foo ' => ' bar ', ' baz ' => ' long ');
echo "Associative array always output as object:", Json_encode ($d), "\ n";
echo "Associative array always output as object:", Json_encode ($d, json_force_object), "\ n";
?>
The above routines will output:
Copy Code code as follows:
Normal: [" <foo> "," ' Bar ' "," \ "Baz\" "," &blong& "," \u00e9 "]
Tags: ["\u003cfoo\u003e", "' Bar '", "\" Baz\ "", "&blong&", "\u00e9"]
Apos: ["<foo>", "\u0027bar\ u0027 "," \ "Baz\" "," &blong& "," \u00e9 "]
Quot: [" <foo> "," ' Bar ' "," \u0022baz\u0022 "," &blong& "," \u00e9 "]
Amp: [" <foo> "," ' Bar ' "," \ "Baz\" "," \u0026blong\u0026 "," \u00e9 "]
Unicode: [" <foo> "," ' Bar ' "," \ "Baz\" "," &blong& "," E "]
All: [" \u003cfoo\u003e "," \u0027bar\u0027 "," \u0022baz\u0022 "," "\ u0026blong\u0026 "," 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 OUTPU T as object: {"foo": "Bar", "baz": "Long"}
Example #3 continuous and discontinuous array example
Copy Code code as follows:
<?php
echo "contiguous array". Php_eol;
$sequential = Array ("foo", "Bar", "Baz", "Blong");
Var_dump (
$sequential,
Json_encode ($sequential)
);
echo Php_eol. " Non-contiguous array ". Php_eol;
$nonsequential = Array (1=> "foo", 2=> "bar", 3=> "Baz", 4=> "Blong");
Var_dump (
$nonsequential,
Json_encode ($nonsequential)
);
echo Php_eol. " Deletes a contiguous array of values resulting from a continuous array. Php_eol;
Unset ($sequential [1]);
Var_dump (
$sequential,
Json_encode ($sequential)
);
?>
The above routines will output:
Copy Code code as follows:
Contiguous array
Array (4) {
[0]=>
String (3) "Foo"
[1]=>
String (3) "Bar"
[2]=>
String (3) "Baz"
[3]=>
String (5) "Blong"
}
string ["foo", "Bar", "Baz", "Blong"] "
Non-contiguous arrays
Array (4) {
[1]=>
String (3) "Foo"
[2]=>
String (3) "Bar"
[3]=>
String (3) "Baz"
[4]=>
String (5) "Blong"
}
String (1): "foo", "2": "Bar", "3": "Baz", "4": "Blong"} "
A discontinuous array that is generated by deleting a contiguous array value
Array (3) {
[0]=>
String (3) "Foo"
[2]=>
String (3) "Baz"
[3]=>
String (5) "Blong"
}
String "{0": "foo", "2": "Baz", "3": "Blong"} "
Copy Code code as follows:
$obj->name= ' A1 '; $obj->number = ' 123 ';
$obj->contno= ' 000 ';
echo Json_encode ($obj);
The results are:
Copy Code code as follows:
{' Name ': ' A1 ',
"Number": "123",
"Contno": "000"
}
You can see that Json_encode () and Json_decode () are compile and decompile, and note that JSON only accepts UTF-8 encoded characters, so the argument for Json_encode () must be utf-8 encoded, or it will get null characters or NULL.
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