PHP isset v.s empty v.s null

last updated December 2021

$var	isset($var)	empty($var)	is_null($var)
”” (empty string)
” ” (space)
FALSE
TRUE
array() (empty array)
null
“0” (string)
0 (int)
0.0 (float)

isset — Determine if a variable is declared and is different than null
empty — Determine whether a variable is empty
is_null — Finds whether a variable is null

Compatibility: PHP ≥ 4 (is_null, PHP ≥ 4.04)

hope its useful! ✌ Sami