(PHP 5 >= 5.2.0, PECL json >= 1.2.0)
json_encode — Returns the JSON representation of a value
Returns a string containing the JSON representation of value .
The value being encoded. Can be any type except a resource.
This function only works with UTF-8 encoded data.
Bitmask consisting of JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_FORCE_OBJECT. Defaults to 0.
Returns a JSON encoded string on success.
| Version | Description |
|---|---|
| 5.2.1 | Added support to JSON encode basic types. |
| 5.3.0 | The options parameter was added. |
Example #1 A json_encode() example
<?php
$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
echo json_encode($arr);
?>
The above example will output:
{"a":1,"b":2,"c":3,"d":4,"e":5}
Example #2 A json_encode() example showing all the options in action
<?php
$a = array('<foo>',"'bar'",'"baz"','&blong&');
echo "Normal: ", json_encode($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 "All: ", json_encode($a,JSON_HEX_TAG|JSON_HEX_APOS|JSON_HEX_QUOT|JSON_HEX_AMP), "\n\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\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\n";
?>
The above example will output:
Normal: ["<foo>","'bar'","\"baz\"","&blong&"]
Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&"]
Apos: ["<foo>","\u0027bar\u0027","\"baz\"","&blong&"]
Quot: ["<foo>","'bar'","\u0022baz\u0022","&blong&"]
Amp: ["<foo>","'bar'","\"baz\"","\u0026blong\u0026"]
All: ["\u003Cfoo\u003E","\u0027bar\u0027","\u0022baz\u0022","\u0026blong\u0026"]
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}}