RE: [PHP] is_null() and is_string() reversed when using in switch case statements... [SOLVED]

> -----Original Message----- > From: Simon J Welsh [mailto:simon@welsh.co.nz] > Sent: Thursday, July 14, 2011 7:29 PM > To: Daevid Vincent > Cc: php-general@lists.php.net > Subject: Re: [PHP] is_null() and is_string() reversed when using in switch > case statements... > > On 15/07/2011, at 1:58 PM, Daevid Vincent wrote: > > > function test($v) > > { > > var_dump($v); > > > > if (is_string($v)) echo "FOUND A STRING.\n"; > > if (is_null($v)) echo "FOUND A NULL.\n"; > > > > switch ($v) > > { > > case is_string($v): > > echo "I think v is a string, so this is broken.\n"; > > break; > > case is_null($v): > > echo "I think v is null, so this is broken.\n"; > > break; > > case is_object($v): > > $v = '{CLASS::'.get_class($v).'}'; > > echo "I think v is a class $v\n"; > > break; > > > > case is_bool($v): > > $v = ($v) ? '{TRUE}' : '{FALSE}'; > > echo "I think v is boolean $v\n"; > > break; > > case is_array($v): > > $v = '['.implode(',',$v).']'; > > echo "I think v is an array $v\n"; > > break; > > case is_numeric($v): > > echo "I think v is a number $v\n"; > > break; > > } > > } > > In both cases, $v is equivalent to false, so is_string(NULL) = false == NULL > == $v, likewise for is_null($v); > > You're most likely after switch(true) { . } rather than switch($v) > --- > Simon Welsh > Admin of http://simon.geek.nz/ Ah! Thanks Simon! That is exactly right. Doh! I should have thought of that... *smacks head* Here is the fruit of my labor (and your fix)... /** * Useful for debugging functions to see parameter names, etc. * Based upon http://www.php.net/manual/en/function.func-get-args.php#103296 * * function anyfunc($arg1, $arg2, $arg3) * { * debug_func(__FUNCTION__, '$arg1, $arg2, $arg3', func_get_args()); * //do useful non-debugging stuff * } * * @access public * @return string * @param string $function_name __FUNCTION__ of the root function as passed into this function * @param string $arg_names the ',,,' encapsulated parameter list of the root function * @param array $arg_vals the result of func_get_args() from the root function passed into this function * @param boolean $show_empty_params (FALSE) * @author Daevid Vincent * @date 2011-17-14 * @see func_get_args(), func_get_arg(), func_num_args() */ function debug_func($function_name, $arg_names, $arg_vals, $show_empty_params=FALSE) { $params = array(); echo $function_name.'('; $arg_names_array = explode(',', $arg_names); //var_dump($arg_names, $arg_names_array, $arg_vals ); foreach($arg_names_array as $k => $parameter_name) { $v = $arg_vals[$k]; //echo "k = $parameter_name = $k and v = arg_vals[k] = $v<br>\n"; switch(true) { case is_string($v): if ($show_empty_params) $v = "'".$v."'" ; break; case is_null($v): if ($show_empty_params) $v = '{NULL}'; break; case is_bool($v): $v = ($v) ? '{TRUE}' : '{FALSE}'; break; case is_array($v): (count($v) < 10) ? $v = '['.implode(',',$v).']' : $v = '[ARRAY]'; break; case is_object($v): $v = '{CLASS::'.get_class($v).'}'; break; case is_numeric($v): break; } if ($show_empty_params || $v) $params[$k] = trim($parameter_name).': '.$v; } echo implode(', ',$params).")<br/>\n"; }