empty() does not generate a warning if the variable does not exist. Again if you pass multiple variables to the PHP isset function, then if all the variables are not null, the function returns a true value. PHP has multiple functions used to check PHP variables with respect to their initialized values. I'm pretty sure it's really simple . The function returns a boolean value as the result of the output of the function. using "empty" with multiple variables. These functions are, isset() is to check if a variable is set with a value. The difference with isset() is, isset has NULL check enabled. Here the biggest advantage is we can pass data to a different site even running at different servers. PHP doesn't have an explicit statement to initialise variables, like Javascript's var. The PHP assignment operators are used with numeric values to write a value to a variable. Topic: PHP / MySQL Prev|Next Answer: Use the PHP empty() function. It's a design choice, for better or worse. Anyway, any help would be appreciated. Since a variable must have some value and PHP's value for "nothing" is null, you want: I am trying to make sure that 2 fields are filled before I insert them into my database. Passing variables with data between pages using URL There are different ways by which values of variables can be passed between pages.One of the ways is to use the URL to pass the values or data. empty() function in PHP. On the other hand, if you don’t have access to the php.ini file, and you're using the Apache web server, you could also set this variable using the .htaccess file. Here we will learn what is an empty function and how to use this function. Back to the original question, " ... if variable is not empty, echo some html code. Seems like folks are complicating this a bit. A variable is considered empty if it does not exist or if its value equals FALSE.. Let's try out the following example to understand how this function basically works: Associative arrays: Arrays having named keys. Determine whether a variable is considered to be empty. If a variable has been unset with unset(), it will no longer be set. PHP variables get initialised when they're first assigned to. Obviously I want all of those variables to be checked if they are empty or not. It means that the left operand gets set to the value of the assignment expression on the right. To create a variable you always have to assign something to it. Note: Why it is always good practice to declare an empty array and then push the items to that array? Multidimensional arrays: It contains one or more array in particular array. empty() is to check if a given variable is empty. ""I would like to display some html code if a variable is not empty, else I would like to display nothing. PHP Assignment Operators. Basically, empty() function can be used to check a variable is empty or not in PHP. But, if the variable is not null and empty, it returns a true value. A variable is considered empty if it does not exist or if its value equals false. Arrays in PHP: Use array() Function to create an array in PHP. I did a quick Google and found that checking if the variables are null wouldn't be the correct way of solving this situation because an "empty string" is still not null? php_value session.auto_start 1 If you add the above line in the .htaccess file, that should start a session automatically in your PHP application. You can use the PHP empty() function to find out whether a variable is empty or not. There are three types of array supported in PHP: Indexed arrays: Arrays having a numeric index. The basic assignment operator in PHP is "=". How to check whether a variable is empty in PHP. Code language: PHP (php) Determine if a variable is set and is not NULL..