First let's explain what each one does. Three useful functions for this are isset(), empty() and is_null(). is_null() = To check whether a variable is defined as NULL. There are the Following The simple About PHP isset() vs empty() vs is_null() in PHP Full Information With Example and source code.. As I will cover this Post with live Working example to develop difference between PHP isset() vs empty() vs is_null(), so the php check if string is empty or whitespace is used for this example is following below. empty() = To check if a given variable is empty. For arrays and strings, PHP follows the convention that "empty" means "has no members" although arrays and strings are not technically sets. Some PHP statements and functions that appear to reference a variable donât actually reference it in the normal way. which is used to test/check if a variable value is set or not. This function returns the result as a boolean form (TRUE / FALSE). PHP empty isset is_null. Determine if a variable is considered set, this means if a variable is declared and is different than null.. Ø¨Ù ÙÙØ¹ Ø¯Ø§Ø¯Ù ÙØ§ Ø¯Ø± php Ø§Ø³Øª Ú©Ù Ø¨Ø±Ø§Û ÚÚ© Ú©Ø±Ø¯Ù Ø®Ø§ÙÛ Ø¨ÙØ¯Ù ÛØ§ ÙØ¨ÙØ¯Ù Ù ÙØ¯Ø§Ø± ÛÚ© Ø¢Ø±Ø§ÛÙ Ø Ù ØªØºÛØ± Ø§Ø³ØªÙØ§Ø¯Ù Ù Û Ø´ÙØ¯ .. ØªØ§Ø¨Ø¹ isset ÚÚ© Ù ÛÚ©ÙØ¯ Ø¢ÛØ§ ÛÚ© Ù ØªØºÛØ± Ø¯Ø§Ø±Ø§Û Ù ÙØ¯Ø§Ø± Ø§Ø³Øª ÛØ§ ÙÙ. The difference with isset() is, isset has NULL check enabled. PHP isset() function. If a variable has been unset with the unset() function, it is no longer considered to be set.. isset() will return false when checking a variable that has been assigned to null.Also note that a null character ("\0") is not equivalent to the PHP null constant. More than 3 years have passed since last update. The blog post PHP isset() vs empty() vs is_null() by Virendra Chandak from 2012 gives a good comparison of isset(), empty() and is_null(). isset vs. empty vs. is_null : isset() is to check if a variable is set with a value. All these function return a boolean value. PHP isset() and empty() are frequently used to check the values of variables. PHP apparantly has this funny idea that 0 and 0.0 are also "empty", by PHP design. When invoking the isset and empty functions, for example, the E_NOTICE event is never triggered. is_null() â It is to check whether a variable is defined as NULL. Here is a table covering various frequently used scenarios and the return value from these functions. In the PHP world, apparantly uninitialized variables have the Null value, and isset on such a variable returns FALSE. PHP has a lot of ways of dealing with variable checking. These have been tried on Ubuntu Linux with php version 5.5.9. PHP isset vs empty vs is_null function returns result as Boolean form (TREU / FALSE). But passing an undefined variable to is_null (or â¦ is_null() isset() = To check if a variable is set with a value. In some cases is_null is also used. If these functions are not used in correct way they can cause unexpected results. There are functions that check each type like is_array, is_object or is_bool and there are functions that can be used to check multiple conditions at once. Ð£ÑÐ¾ÐºÐ¸ PHP â ÐÐ¾Ð»Ð¸ Ð²Ð¸ÐºÐ¾ÑÐ¸ÑÑÐ¾Ð²ÑÐ²Ð°ÑÐ¸ isset(), empty() ÑÐ° is_null() Ð² PHP ÐÐ¾ÑÐ¸ÑÑ ÑÐ°ÑÑÐ¾, Ð¿ÑÐ¸ Ð½Ð°Ð¿Ð¸ÑÐ°Ð½Ð½Ñ PHP ÐºÐ¾Ð´Ñ, Ð²Ð¸Ð½Ð¸ÐºÐ°ÑÑÑ ÑÐ¸ÑÑÐ°ÑÑÑ, ÐºÐ¾Ð»Ð¸ ÑÐ¾Ð±Ð¾ÑÐ¸Ð¹ Ð½Ð° Ð²Ð¸Ð³Ð»ÑÐ´ ÐºÐ¾Ð´ Ð½Ðµ Ð¿ÑÐ°ÑÑÑ. Defination:-isset() is a inbuilt function of PHP. empty() is to check if a given variable is empty. Today we will be dealing with the differences between is_null(), empty() and isset(). Following is the output that you will see on PHP 7.4.13 PHP ç©ºå¤å®ã¡ã½ããã®è¿ãå¤ empty, isset, is_null åå¿é².