Particularly, in regards to user-submitted string … The PHP empty() function used to check whether the string is empty or not. The PHP function empty is often used to check if a particular variable is empty or not (duh). When use ==, as you did, PHP treats NULL, false, 0, the empty string, and empty arrays as equal. Name * In PHP the empty() function return true if the variable has empty or zero value and it return false if string has non-empty or non-zero value. empty() From PHP Manual – empty():. Let’s say we have the following strings. Your email address will not be published. As noted earlier, is_string() returns false on an object that has a __toString() method. If it does exist, then it checks to see if the variable is a “falsey” value. It is very useful. 2 Replies to “ Flow Condition – check string is empty ” Dan Sanders says: August 11, 2020 at 4:54 am Thanks Anita, very handy . The empty() function returns true if a string is empty… You can use the strict equality operator (===) to check whether a string is empty or not. 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. 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. I want to check if the entire string is ONLY white space… empty — Determine whether a variable is empty. 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: Reason to check both function: The isset() and !empty() functions are similar and both will return the same results. To check if a string is null or empty in Java, use the == operator. PHP empty() function. I will explain further in the later part of this tutorial, first syntax and live examples of using the empty function. Possible Duplicate: If string only contains spaces? But the only difference is !empty() function will not generate any warning or e-notice when the variable does not exists. 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 … First, it checks to see if the variable exists. String myStr1 = "Jack Sparrow"; String myStr2 = ""; I do not want to change a string nor do I want to check if it contains white space. Leave a Reply Cancel reply. In other words, it will return true if the variable is an empty string, false, array(), NULL, “0?, 0, and an unset variable. Required fields are marked * Comment. The PHP empty function is used to determine if a variable is empty or not. To check whether a given string is empty or not, we can use the built-in empty() function in PHP language. PHP empty() function syntax: empty(“string”); PHP example of empty… However, there is a bit of caveat that you should be aware of. It is enough to use either of the function. Here is a simple way to do a check that will work: