1. Environment configuration
In php5.2.0 and above versions, JSON extension has been built-in
2. JOSN () function
json_encode Perform the variable json encoding
# JSON_DECODE to decod in json format, convert it to PHP variables
json_last_error Return to return The last error that occurred
json_encode
is used to JSON encode the variable. If the function is successfully executed, it returns JSON data, otherwise it returns FALSE
Syntax: string json_encode ( $value [, $options = 0 ] )
Parameters:
value: The value to be encoded. This function is only valid for UTF-8 encoded data.
options: 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
## Example 1:How to convert a PHP array into json data
<?php
$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?>
The following example demonstrates how to convert a PHP object into JSON format data:
<?php
class Emp {
public $name = "";
public $hobbies = "";
public $birthdate = "";
}
$e = new Emp();
$e->name = "sachin";
$e->hobbies = "sports";
$e->birthdate = date('m/d/Y h:i:s a', strtotime("8/5/1974 12:20:03"));
echo json_encode($e);
?>json_decode
PHP json_decode() function is used to decode JSON format strings and convert them into PHP variables.
Syntax
mixed json_decode ($json [,$assoc = false [, $depth = 512 [, $options = 0 ]] ])
Parameters
json_string: JSON string to be decoded, must be UTF-8 encoded data
assoc: When this parameter is TRUE, an array will be returned, and when FALSE, an object will be returned.
depth: Integer type parameter, which specifies the recursion depth
options: Binary mask, currently only JSON_BIGINT_AS_STRING is supported.
Example
The following example demonstrates how to decode JSON data:
<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
echo "<pre>";
var_dump(json_decode($json));
var_dump(json_decode($json, true));
echo "</pre>";
?>
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