How can I have a boolean returning function?
I mean like this on other programming language.
return true; // return false
-
9that's exactly how you do it in PHP.Stephen– Stephen2011-02-08 12:40:35 +00:00Commented Feb 8, 2011 at 12:40
Add a comment
|
6 Answers
The question does not entirely make sense, because you have not asked something you've already solved.
The function in PHP can be done like this.
function check($int) {
if ($int == 3) {
return true;
} else {
return false;
}
}
if (check(3)) echo "Returned true!";
5 Comments
Cyril Horad
Can I also check in the if isset($int)? And instead of 3, another parameter named $length?
Mark Baker
@Cyril - you can check whatever you want... you just need to code the function to do that check... I suggest you read the relevant section of the PHP documentation on functions uk.php.net/manual/en/language.functions.php
AntonioCS
Wouldn't it be simpler if it was return ($int == 3);
BGPHiJACK
@AntonioCS Yes, that would be a more ideal way to go about things but keep in mind that's a little more advanced and should not be demonstrated to beginners without a grasp of the fundamentals. That's correct completely though and personally I do it that way too if I am doing a compare. :)
Felipe
Thanks (: I'm a Obj-C developer PHP is quite lot of magic for me. Cheers.
Incredibly enough
return true;
e.g.
function testIfABC($x) {
if ($x === 'ABC') {
return true;
}
return false;
}
though that could more easily be written as:
function testIfABC($x) {
return ($x === 'ABC');
}
which will still return a boolean value
Comments
<?php
function doSomething() {
return true;
}
The function you need could look like this:
function check($var, $length) {
return (strlen($var)<=$length) && (isset($var));
}
?>
2 Comments
Cyril Horad
Strange, I have this function function check($var, $length) { if((strlen(var)<=$length) && (isset($var))) { return true; } else { return false; } }. The function checks whether there's a value on $var and if the strlen()<=$length... When running I get an error on the if line.
oopbase
Probably "strlen($var)" instead of "strlen(var)" ?
As a more practical example, you can use any boolean expression as result:
return ($data != "expected") or ($param == 17);
Comments
Since PHP 5.5 you can use the boolval function:
(PHP 5 >= 5.5.0, PHP 7) boolval — Get the boolean value of a variable
return boolval( $result );
Or just convert to boolean. But perhaps all this is not necessary:
To explicitly convert a value to boolean, use the
(bool)or(boolean)casts. However, in most cases the cast is unnecessary, since a value will be automatically converted if an operator, function or control structure requires a boolean argument.
return (bool) $result;
return (boolean) $result;
Comments
I do understand the question, as in visual C# you can define a function to return bool only. This is not the case in PHP. You can just use function blabla($val) { return ($val == "yes" ? true : false); }. No support for "public bool($value) { return true; // false }"
