Regarding the processing of hexadecimal strings in PHP7

This article is from the PHP7 tutorial column to introduce to you the problems of "0xFFFFFFFF" and 0xFFFFFFFF in php7. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Specific question:

$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * ("0xd5b42e11"));
var_dump($t1,$t2);

The value of the above code in php7 (not included) and the following platforms is:

int(364129809)
int(364129809)

And the value in php7 is:

int(364129809)
int(0)

Excuse me, in the php7 environment, how should I deal with 0x.$str to make it the same as the above value?

Solution:

Starting from PHP7, strings containing hexadecimal are no longer considered numbers

If you have to check whether the string Containing hexadecimal numbers, the officially recommended code is

<?php
$str = "0xffff";
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
if (false === $int) {
    throw new Exception("Invalid integer!");
}
var_dump($int); // int(65535)
?>

which should be changed to

$t1 = 0x3FFFFFFF & (1 * (0xd5b42e11));
$t2 = 0x3FFFFFFF & (1 * (filter_var("0xd5b42e11", FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX)));
var_dump($t1,$t2);

for the above problems.

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