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<?php class Foo { public $bar; } $foo = new Foo; $arr = array("", " ", FALSE, TRUE, array(), NULL, "0", 0, 0.0, new stdClass, $foo, $foo->bar, "\0"); define('PAD', 20); $headings = array('type', 'if', 'isset', 'empty', 'is_null'); foreach($headings as $heading){ echo str_pad($heading, PAD), " | "; } echo "\n"; $x = str_pad("TRUE", PAD) . " | "; $y = str_pad("", PAD) . " | "; foreach($arr as $val){ var_dump($val); /* echo str_pad(print($val), PAD), " | "; echo $val ? $x : $y; echo isset($val) ? $x : $y; echo empty($val) ? $x : $y; echo is_null($val) ? $x : $y; echo "\n"; */ }
Output for git.master, git.master_jit, rfc.property-hooks
type | if | isset | empty | is_null | string(0) "" string(1) " " bool(false) bool(true) array(0) { } NULL string(1) "0" int(0) float(0) object(stdClass)#2 (0) { } object(Foo)#1 (1) { ["bar"]=> NULL } NULL string(1) ""

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