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  • difference between PHP isset() vs empty() vs is_null()

    @devendra.bhandari
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    PHP has different types of built-in functions which can be used to check the value of a variable. Basically there are three useful functions you can use for test the value of a variable i.e. isset(), empty() and is_null(). All these php function return a Boolean value.

    isset() - It determine if a variable is set and is not NUL
    empty() - It determine whether a variable is empty
    is_null() - Finds whether a variable is NULL

    Please check the below table for what these functions will return for different values. The blank spaces indicates that the function returns bool(false).

    Value of variable ($var) isset($var) empty($var) is_null($var)
    (an empty string) bool(true) bool(true)
    (space) bool(true)
    FALSE bool(true) bool(true)
    TRUE bool(true)
    array() (an empty array) bool(true) bool(true)
    NULL bool(true) bool(true)
    0 (0 as a string) bool(true) bool(true)
    0 (0 as an integer) bool(true) bool(true)
    0.0 (0 as a float) bool(true) bool(true)
    var $var; (a variable declared, but without a value) bool(true) bool(true)
    NULL byte (\ 0) bool(true)
    isset empty php
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