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@amagurix(R. Oguri)

PHP 空判定メソッドの返り値　empty, isset, is_null 備忘録

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空判定の返り値早見表 （＠覚えられない）

値 if($var) isset($var) empty($var) is_null($var)
$var=1 TRUE TRUE FALSE FALSE
$var="" FALSE TRUE TRUE FALSE
$var="0" FALSE TRUE TRUE FALSE
$var=0 FALSE TRUE TRUE FALSE
$var=NULL FALSE FALSE TRUE TRUE
$var FALSE FALSE TRUE TRUE
$var=[] FALSE TRUE TRUE FALSE
$var=[1] TRUE TRUE FALSE FALSE
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