".A string can be any text inside quotes.

PHP Data Types of booleans containing description,syntax,List of the types of Boolean value equivalents,examples from w3resource.com When converting to boolean, the following values are considered FALSE: We can cast any variable to Boolean using (bool) or (boolean) keyword. PHP does not break any rules with the values of true and false.

it's a binary thing.

reference to functions and resources external to PHP.A common example of The value true is also not a constant for 1, it is a special boolean value that indicates true.

See also Type Juggling..

There are no similarity between Type Hinting and Type Casting.. Values retrieved from the database are always converted to PHP's boolean type or null if no data is present. Note you can also use the '!' using the resource data type is a database call.We will not talk about the resource type here, since it is an advanced topic.If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: It just happens to cast to integer 1 when you print it or use it in an expression, but it's not the same as a constant for the integer value 1 and you shouldn't use it as one. Beware of certain control behavior with boolean and non boolean values :// Consider that the 0 could by any parameters including itself Here's how to do it. Notice what it says at the top of the page: // ...because this can be used with exactly the same meaning: You can use single or double quotes:An integer data type is a non-decimal number between -2,147,483,648 and To make it more convenient, MySQL provides BOOLEAN or BOOL as the synonym of TINYINT(1).. When compare zero (0) with string it's return true by type jugling. What will be the output you think if we add echo and print both at a time..// prints out: 51     inner 'print' prints the value of $a, then                                                                                                                                     // outer 'print' returns  the boolean true about print $a// prints out: 51     inner 'print' prints the value of $a, then

The value false is not a constant for the number 0, it is a boolean value that indicates false.

Summary: this tutorial shows you how to use MySQL BOOLEAN data type to store Boolean values, true and false.. Introduction to MySQL BOOLEAN data type.

Just a side note, doesn't really matters, the reason -1 is true and not false is because boolean type is treated as unsigned, so -1 would be for example, if it's unsigned int32 translate to hex: 0xFFFFFFFF and back to decimal: 4294967295 which is non-zero.

function returns the data type and value:A float (floating point number) is a number with a decimal point or a number in exponential form.In the following example $x is a float. PHP has several data types such as Boolean, Integer, Float, String, Array, Object and Null. 2,147,483,647.In the following example $x is an integer. A common example of using the resource data type is a database call.

Type casting is to "switching" between types.. As most of the database vendors do not have a native boolean type, this type silently falls back to the smallest possible integer or bit data type if necessary to ensure the least possible data storage requirements are met.

The documentation says: To explicitly convert a value to boolean, use the (bool) or (boolean) casts. Note that the symbolic constants TRUE and FALSE are treated differently.

Variables can store data of different types, and different data types can do To explicitly convert a value to boolean, use the (bool) or (boolean) casts.

to convert a number to a boolean, as if it was an explicit (bool) cast then NOT. The PHP var_dump()

different things.A string is a sequence of characters, like "Hello world! It is the storing of a reference to functions and resources external to PHP. Actually from a complete noob point of view 0 resulting in false makes sense as many languages as I have been taught consider the value 1 as true and the value 0 as false a simple boolean value. If we will convert any variable data type to Boolean then if the variable has value(and value is not 0) then it will return true, otherwise false. function returns the data type and value:A Boolean represents two possible states: TRUE or FALSE.Booleans are often used in conditional testing. For this, we use the class keyword. A class is a structure that can contain properties and methods:Null is a special data type which can have only one value: NULL.A variable of data type NULL is a variable that has no value assigned to it.Variables can also be emptied by setting the value to NULL:The special resource type is not an actual data type.