PHP - why equal string are not equal with NumberFormatter-CodePudding

Why are below code echos not equal even if both strings are equal?

$number = 1234567.89;
$expected = 'GBP 1,234,567.89';

$fmt = new NumberFormatter('en_AU@currency=GBP', NumberFormatter::CURRENCY);
$currency = $fmt->formatCurrency($number, 'GBP');

echo "$expected = $currency ?" . PHP_EOL;
echo $expected == $currency ? 'equals' : "not equal";

Output

GBP 1,234,567.89 = GBP 1,234,567.89 ?
not equal

Any help will be really helpful, thanks

CodePudding user response：

Because $expected variable has a whitespace after "GBP"

$expected = 'GBP 1,234,567.89';

does not equal to 'GBP1,234,567.89';

actually you can debug them;

echo $expected;
echo "<br>";
echo $currency;

CodePudding user response：

Okay trying a few things I got the answer. The $exoected and $currency has a different encoding.

print_r([mb_detect_encoding($expected), mb_detect_encoding($currency)]);

Array
(
    [0] => ASCII
    [1] => UTF-8
)

The space character in $currency is 194 ASCII number whereas space character in $expected is 32

if (preg_match('/[^a-zA-Z0-9 ] /', $number, $matches)) {
    print_r(ord($matches[0]));
    print_r(ord(' '));
}

Hope this helps someone who scratching their head