Is an empty string false PHP?

The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0.

Is empty string false?

5 Answers. Yes. All false , 0 , empty strings ” and “” , NaN , undefined , and null are always evaluated as false ; everything else is true .

What is considered false in PHP?

Converting to boolean ¶

When converting to bool, the following values are considered false : the boolean false itself. the integer 0 (zero) the floats 0.0 and -0.0 (zero)

Is a string true in PHP?

20 Answers. Strings always evaluate to boolean true unless they have a value that’s considered “empty” by PHP (taken from the documentation for empty ): “” (an empty string); “0” (0 as a string)

What evaluates to false PHP?

Summary. A boolean value represents a truth value, which is either true or false . PHP evaluates the following values to false: false, 0, 0.0, empty string (“”), “0”, NULL, an empty array; other values are true .

How do I check if a string is empty?

Approach:

  1. Get the String to be checked in str.
  2. We can simply check if the string is empty or not using the isEmpty() method of String class. Syntax: if (str.isEmpty())
  3. Print true if the above condition is true. Else print false.
IMPORTANT:  How do I save a SQL query result to a file?

Is 0 false or true?

Like in C, the integers 0 (false) and 1 (true—in fact any nonzero integer) are used.

Is equal to in PHP?

The comparison operator called as the Identical operator is the triple equal sign “===”. This operator allows for a much stricter comparison between the given variables or values. This operator returns true if both variable contains same information and same data types otherwise return false.

IS NULL equal false PHP?

If you echo that in PHP, you’ll get nothing. But, it’s still a string. … And that’s why we have null , to tell the difference between an empty string and “nothing”. null is equal to false , 0 and an empty string.

Is 0 True or false C++?

Zero is used to represent false, and One is used to represent true. For interpretation, Zero is interpreted as false and anything non-zero is interpreted as true. C++ is backwards compatible, so the C-style logic still works in C++. ( “true” is stored as 1, “false” as 0. )

Is not a string PHP?

The is_string() function checks whether a variable is of type string or not. This function returns true (1) if the variable is of type string, otherwise it returns false/nothing.

Is boolean a PHP?

The is_bool() function checks whether a variable is a boolean or not. This function returns true (1) if the variable is a boolean, otherwise it returns false/nothing.

Code Academy