php check if string is empty

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To check whether a given string is empty or not, we can use the built-in empty() function in PHP language. The PHP empty() function used to check whether the string is empty or not. However, there is a bit of caveat that you should be aware of. When use ==, as you did, PHP treats NULL, false, 0, the empty string, and empty arrays as equal. I will explain further in the later part of this tutorial, first syntax and live examples of using the empty function. Dinesh says: November 4, 2020 at 11:12 am Thanks Anita. The PHP empty function is used to determine if a variable is empty or not. 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: String myStr1 = "Jack Sparrow"; String myStr2 = ""; You can use the strict equality operator (===) to check whether a string is empty or not. If it does exist, then it checks to see if the variable is a “falsey” value. 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 … 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. Reason to check both function: The isset() and !empty() functions are similar and both will return the same results. share | improve this answer | follow | edited Dec 11 '19 at 23:39 As noted earlier, is_string() returns false on an object that has a __toString() method. Here is a simple way to do a check that will work:

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