/**
* is json format
* check the string that it is valid json encoded format.
* example:
* original (int)123 decode=> (int)123 = original is valid json encoded
* (str)123 => (int)123 = valid
* (str)0123 => (int)123 = invalid!
* (str)"0123" => (str)0123 = valid
* (str)null => null = valid
* (str)false => (bool)false = valid
* (str)true => (bool)true = valid
*
* @param string $string
* @return boolean
*/
public static function isJsonFormat($string)
{
if (is_array($string) || is_object($string)) {
return false;
}
$result = \Str::is_json($string);
if ($result === true) {
if (preg_match('/{([^}]*)}/', $string) === 1 || preg_match('/"([^"]+)"/', $string) === 1) {
return true;
} else {
// if input value is null or boolean or boolean string (json encoded).
if (is_null(json_decode($string)) || (is_bool(json_decode($string)) || is_bool($string))) {
return true;
}
// if input value is number. make very sure that it is equal string length. (0123 is not equal to 123 which 0123 (string) is not valid json encoded)
if (is_numeric($string) && mb_strlen($string) == mb_strlen(json_decode($string))) {
return true;
}
return false;
}
}
return $result;
}
/**
* Test for Str::is_json()
*
* @test
*/
public function test_is_json()
{
$values = array('fuelphp', 'is' => array('awesome' => true));
$string = json_encode($values);
$this->assertTrue(Str::is_json($string));
$string = serialize($values);
$this->assertFalse(Str::is_json($string));
}
