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Encoding

An object or array can be encoded to become a JSON string: json_encode($m [,$i1=0 [,$i2=512]]).
$m can be an object, an array, scalar types or NULL. $i1 is a bitmask consisting of 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. $i2 is a positive integer representing the maximum depth.
The string representation of a JSON object may be in the form of an object, denoted by {}, or an array, denoted by []. Scalar values are encoded into the same, corresponding types.
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<?php

$a = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
echo json_encode($a),"<br/>";

$a = array('<cat>',"'dog'",'"cow"','&fish&', "\xc4\xa9");
echo json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE),"<br/>";

$a = array(array(1,2,3));
echo json_encode($a), "<br/>";
echo json_encode($a, JSON_FORCE_OBJECT), "<br/>";

$a = array("cat", "dog", "cow", "fish");
echo json_encode($a), "<br/>";

unset($a[0]);
echo json_encode($a), "<br/>";

class cl{
   public $v1=1;
   private $v2=2;
}
$a = new cl;
echo json_encode($a), "<br/>";

echo json_encode("abc"), "<br/>";
echo json_encode(3);
?>