Para convertir un tipo en booleano, puede usar la conversión (bool) o (boolean) antes del tipo. Consequently, PHP designers decided to treat 0 and "0" similarly, ie. can perform the same task with the same result if your PHP is not up2date var_dump(! The value false is not a constant for the number 0, it is a boolean value that indicates false. there isn't really a "negative boolean". "\n"; // prints "1\n" echo FALSE . Notice what it says at the top of the page: It appears there's a lot more truth in this universe, but false can trump anything that's true... When compare zero (0) with string it's return true by type jugling. "\n"; // prints "\n" ?> Why doesn't php -f test.php print TRUE or FALSE? echo también posee una sintaxis abreviada, donde se puede poner el símbolo igual justo después de la etiqueta de apertura de PHP. 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. Note you can also use the '!'
When compare with TRUE with also the same string it's also returning true. To echo a boolean value, we can use the ternary operator (?) //array_search returns index of element, and FALSE if nothing is found//but any non-existent element will also remove 'A'! Ah, yes, booleans - bit values that are either set (TRUE) or not set (FALSE). var_dump((bool) "1"); //evaluates to true o llame a la función boolval : Beware of certain control behavior with boolean and non boolean values :// Consider that the 0 could by any parameters including itself
It is correct that TRUE or FALSE should not be used as constants for the numbers 0 and 1. Function to sort array by elements and count of element (before php 5.3) (not use Lambda Functions, and Closures); ""); outputs: boolean true boolean false boolean true boolean false May the life be good to you. in Php. I was told that this is a feature, not a bug. More importantly, in the FALSE case, why doesn't it print anything? to convert a number to a boolean, as if it was an explicit (bool) cast then NOT. PHP does not break any rules with the values of true and false.
The value true is also not a constant for 1, it is a special boolean value that indicates true. Dunno if someone else posted this solution already, but if not, here's a useful and function to convert strings to strict booleans. Here's how to do it. PHP often tries to autoconvert these strings to numeral, as the programmer certainly intended (try 'echo "2"+3'). :o (since it used to be a bit and then there was only 0 and 1 as an option)
Now that we have 64 bit compilers using an int variable for booleans, there is *one* value which is FALSE (zero) and 2**64-1 values that are TRUE (everything else). it's a binary thing. Note that the symbolic constants TRUE and FALSE are treated differently. Given the following test.php:
"test", !! Note that the comparison: (false == 0) evaluates to true and so will any value you set to false as well (without casting). Los booleanos se pueden usar en sentencias como esta: Debido al hecho de que PHP está escrito de forma débil, si Para evitar esta comparación, puede imponer una comparación sólida utilizando Para convertir un tipo en booleano, puede usar la conversión Conversión booleana a una cadena (tenga en cuenta que Tenga en cuenta que lo contrario también es posible: También todo lo que no sea cero devolverá verdadero: This modified text is an extract of the original Stack Overflow Documentation created by following I was afraid someone would say this I always try to make something as simple as possible, with as few ifs as possible. But there may be times when it might be helpful to see the value of the Boolean as a 1 or 0.
falsy, for consistency and to avoid bugs where the programmer believes he got a true …
// ...because this can be used with exactly the same meaning: I believe that the double negation !!
!0, !! 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.
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