Is There Any Particular Difference Between Intval and Casting to Int - '(Int) X'

Is there any particular difference between intval and casting to int - `(int) X`?

intval() can be passed a base from which to convert. (int) cannot.

int intval( mixed $var  [, int $base = 10  ] )

What is the difference between (int) and intval()?

intval() accepts a second argument ($base) while (int) doesn't.

int intval( mixed $var  [, int $base = 10  ] )

But as long as you call intval() with just 1 argument (like in your case), there's no difference.

When should one use intval and when int

1. intval is slower than casting to int (it's a function)
2. intval can accept a base if its first parameter is a string

Since the second item is really obscure, objectively we should say that intval is simply "worse".

However, personally I like reading intval($var) better than (int)$var (the latter may also require wrapping in additional parens) and since if you are converting to int inside a loop you are definitely doing something wrong, I use intval.

PHP - Purpose of intval()?

intval() lets you specify a base to convert from.

$decimal_value = intval("FF", 16)

For simple base-10 conversions, there's no reason to use intval().

Is (int)$var same as intval($var)?

(int) would seem to be a bit faster than intval, as you don't have the overhead of a function call. intval also allows you to set an optional base to convert to, which might be useful:

int intval ( mixed $var [, int $base = 10 ] )

In PHP, why use inval() rather than casting with (int)?

In contrast to casting, intval also allows non-decimal bases.

Additionally, every programmer knows functions and can easily look them up at php.net/function, whereas casts are not as widely known.

Best Option for integer validation: intval() or filter_input() or casting int's

You would want to use FILTER_VALIDATE_INT

EDIT: with the option min_range of 1 assuming you are using an AUTO_INCREMENT value for user_id in your database

if($user_id = filter_input(INPUT_POST, 'user_id', FILTER_VALIDATE_INT, 1)){ 
    //success
}

This validates it is an integer and then returns a cleaned variable if validation passes.

How do I convert a String to an int in Java?

String myString = "1234";
int foo = Integer.parseInt(myString);

If you look at the Java documentation you'll notice the "catch" is that this function can throw a NumberFormatException, which you can handle:

int foo;
try {
   foo = Integer.parseInt(myString);
}
catch (NumberFormatException e) {
   foo = 0;
}

(This treatment defaults a malformed number to 0, but you can do something else if you like.)

Alternatively, you can use an Ints method from the Guava library, which in combination with Java 8's Optional, makes for a powerful and concise way to convert a string into an int:

import com.google.common.primitives.Ints;

int foo = Optional.ofNullable(myString)
 .map(Ints::tryParse)
 .orElse(0)

How do I parse a string to a float or int?

>>> a = "545.2222"
>>> float(a)
545.22220000000004
>>> int(float(a))
545

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