Is null false in PHP?
NULL essentially means a variable has no value assigned to it; false is a valid Boolean value, 0 is a valid integer value, and PHP has some fairly ugly conversions between 0 , “0” , “” , and false . Null is nothing, False is a bit, and 0 is (probably) 32 bits.
What is considered false in PHP?
When converting to boolean, the following values are considered FALSE: the boolean FALSE itself. the integer 0 (zero) the float 0.0 (zero)
Is empty array false PHP?
An empty array is falsey in PHP, so you don’t even need to use empty() as others have suggested. PHP’s empty() determines if a variable doesn’t exist or has a falsey value (like array() , 0 , null , false , etc).
Is a string true PHP?
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)
Is 1 True of false?
BUT the language derives true and false in an unusual way. Basicly there is no boolean value. The number 0 is considered to be false and all other numbers are considered to be true…. … 1 is considered to be true because it is non-zero.
Is 1 true in PHP?
3 Answers. A boolean TRUE value is converted to the string “1”. Boolean FALSE is converted to “” (the empty string). This allows conversion back and forth between boolean and string values.
Is boolean true 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 .
Is PHP a whitespace?
A ctype_space() function in PHP is used to check whether each and every character of a string is whitespace character or not. It returns True if the all characters are white space, else returns False.
Is empty in PHP?
PHP empty() Function
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.