PHP JSON
In this chapter we will introduce how to use PHP language to encode and decode JSON objects.
Environment configuration
JSON extension has been built-in in php5.2.0 and above.
JSON Function
| Function | Description |
|---|---|
| json_encode | JSON encoding for variables |
| json_decode | Decode the string in JSON format and convert it into a PHP variable |
| json_last_error | Return the last error that occurred |
json_encode
PHP json_encode() is used to JSON encode variables , this function returns JSON data if executed successfully, otherwise it returns FALSE.
Syntax
string json_encode ( $value [, $options = 0 ] )
Parameters
value: to be encoded value. 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
<?php
$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($arr);
?> The result of executing the above code is: {"a":1,"b":2,"c":3,"d":4,"e":5}The following example demonstrates how to convert PHP objects 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', "8/5/1974 12:20:03 p");
$e->birthdate = date('m/d/Y h:i:s a', strtotime("8/5/1974 12:20:03"));
echo json_encode($e);
?>The execution result of the above code is: {"name":"sachin","hobbies":"sports","birthdate":"08\/05\/1974 12:20:03 pm"}json_decodePHP 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 ]]])
json_string: To be decoded JSON string, 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: Parameter of type integer, which specifies the recursion depth
options: Binary Mask, currently only JSON_BIGINT_AS_STRING is supported.
<?php
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
var_dump(json_decode($json));
var_dump(json_decode($json, true));
?>The execution result of the above code is: 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)
}
