I want to check if the entire string is ONLY white space… But the only difference is !empty() function will not generate any warning or e-notice when the variable does not exists. empty — Determine whether a variable is empty. To check if a string is null or empty in Java, use the == operator. In other words, it will return true if the variable is an empty string, false, array(), NULL, “0?, 0, and an unset variable. To add to @BJorn and @SeanPatrickFloyd The Guava way to do this is: Strings.nullToEmpty(str).isEmpty(); // or Strings.isNullOrEmpty(str); Commons Lang is more readable at times but I have been slowly relying more on Guava plus sometimes Commons Lang is confusing when it comes to isBlank() (as in what is whitespace or not).. Guava’s version of Commons Lang isBlank … Your email address will not be published. empty() From PHP Manual – empty():. The PHP empty function is used to determine if a variable is empty or not. Leave a Reply Cancel reply. Required fields are marked * Comment. It is enough to use either of the function. Possible Duplicate: If string only contains spaces? The PHP empty() function used to check whether the string is empty or not. Name * I will explain further in the later part of this tutorial, first syntax and live examples of using the empty function. Particularly, in regards to user-submitted string … It will return True if the given variable is empty and false if it exists or a non-zero or more than zero characters etc. The empty() function returns true if a string is empty… Note that checking the existence of a subkey of an array when that subkey does not exist but the parent does and is a string will return false for empty. PHP empty() function syntax: empty(“string”); PHP example of empty… PHP empty() function. Reason to check both function: The isset() and !empty() functions are similar and both will return the same results. To check whether a given string is empty or not, we can use the built-in empty() function in PHP language. The comparsion str === "" will only return true if the data type of the value is string and it is not empty, otherwise return false as demonstrated in the following example: As noted earlier, is_string() returns false on an object that has a __toString() method. Dinesh says: November 4, 2020 at 11:12 am Thanks Anita. If it does exist, then it checks to see if the variable is a “falsey” value. However, there is a bit of caveat that you should be aware of. String myStr1 = "Jack Sparrow"; String myStr2 = ""; Here is a simple way to do a check that will work: