php json function usage

Today I submitted a JSON data to PHP using POST method (pay attention to GET method too), for example:

{"a":1,"b":2}

Retrieve this data in PHP: $s=$ _POST['data'] ;//or $_GET['data'], then this string is escaped after being taken out: {"a":1,"b":2}

If called directly:

$obj = json_decode($s);

print_r($obj);

echo $obj->a;

is wrong and an error will be reported. If $s is directly defined: $s='{"a ":1,"b":2}'; then there is no problem. Therefore, when processing JSON in PHP, you need to perform some escaping processing: $s=strips tutorial lashes($_POST['data']); Then proceed to json Just decode it.

json_decode — Encode JSON formatted strings

json_encode — JSON encode variables

Report a bug parameter

value

The value to be encoded can be any data type except resource type. This function can only accept UTF-8 encoded data (Translation: refers to character/string type data)

Report a bug Return value

If the encoding is successful, a string represented in JSON form will be returned.

Report a bug Example

Example #1 A json_encode() example, the code is as follows:

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

echo json_encode($arr);

?>

//The above routine will output :

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

json_encode — JSON encoding of variables

json_decode — JSON format The string is encoded

Report a bug Description

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

Accepts a JSON format string and converts it into a PHP variable

Report a bug Parameters

json

A string in json string format to be decoded.

assoc

When this parameter is TRUE, array will be returned instead of object.

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

Report a bug Example

Example #1 Example of json_decode()

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';

var_dump(json_decode($json) ; 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)

}

*/