User:Ottomata/PHP False

Value	boolean	isset()	empty()
NULL	false	false	true
FALSE	false	true	true
''	false	true	true
0	false	true	true
'0'	false	true	true
'0000'	true	true	false
array()	false	true	true

First the output:

NULL           == false
isset(NULL)    == false
empty(NULL)    == true

false          == false
isset(false)   == true
empty(false)   == true

''             == false
isset('')      == true
empty('')      == true

0              == false
isset(0)       == true
empty(0)       == true

'0'            == false
isset('0')     == true
empty('0')     == true

'0000'         == true
isset('0000')  == true
empty('0000')  == false

array()        == false
isset(array()) == true
empty(array()) == true

And here's the code to output this:

<?php
$values = array(
NULL,
FALSE,
'',
0,
'0',
'0000',
array(),
);

foreach ($values as $value)
{
	if (is_array($value))
		$v = 'array()';
	else
		$v = var_export($value, true);
 	
	if ($value) {
		$conditional = 'true';
	}
	else {
		$conditional = 'false';
	}
	$isset  = var_export(isset($value), true);
	$empty  = var_export(empty($value), true);
	
	printf("%-14s == %s\n%-14s == %s\n%-14s == %s\n\n", $v, $conditional, "isset($v)", $isset, "empty($v)", $empty);
	
}
	
?>