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In PHP, what is the difference between is_null and ==null in PHP? What are the qualifications for both to return true?
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$x === nullNull is a special data type in PHP which can have only one value that is NULL. A variable of data type NULL is a variable that has no value assigned to it. Any variable can be empty by setting the value NULL to the variable.
The is_null() function checks whether a variable is NULL or not. This function returns true (1) if the variable is NULL, otherwise it returns false/nothing.
In PHP, a variable with no value is said to be of null data type. Such a variable has a value defined as NULL. A variable can be explicitly assigned NULL or its value been set to null by using unset() function.
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 . Show activity on this post. Null is nothing, False is a bit, and 0 is (probably) 32 bits.
is_null is the same as === null. Both return true when a variable is null (or unset).
Note that I'm using === and not ==. === compares type as well as value.
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