PHP VERSION: 7.0.22

remove_hex_support_for_strings.php

<?php
// remove hex support for strings

// direct type case
var_dump((int)   '0x123'); // int(0)
var_dump((float) '0x123'); // float(0)
echo PHP_EOL;

// Exception not thrown, instead wrong result is generated here:
$n = (int) $str// 0

// Loose equality comparison
var_dump('0x123' == '291');             // TRUE
var_dump((int) '0x123' == (int) '291'); // FALSE
echo PHP_EOL;

// testing
echo "\nThis is how you can test to see if it's a hex numeric string:\n";
$hex filter_var('0x123'FILTER_VALIDATE_INTFILTER_FLAG_ALLOW_HEX);
var_dump($hex);
echo 
PHP_EOL;

// is_numeric()
$str '0x123';
if (!
is_numeric($str)) {
    throw new 
Exception('Not a number');
}
echo 
PHP_EOL;

// other examples from http://php.net/manual/en/migration70.incompatible.php
echo 'var_dump("0xe" + "0x1")' PHP_EOL;
var_dump("0xe" "0x1");
echo 
'var_dump(substr("foo", "0x1"))' PHP_EOL;
var_dump(substr("foo""0x1"));

Output


int(0)
float(0)

bool(false)
bool(false)


This is how you can test to see if it's a hex numeric string:
int(291)


Unknown Error or Exception!
SOURCE CODE