chr | Functions | PHP

Generate a single-byte string from a number

Syntax

chr ( int $bytevalue ) : string

Parameters

bytevalue

An integer between 0 and 255.

Values outside the valid range (0..255) will be bitwise and'ed with 255, which is equivalent to the following algorithm:

while ($bytevalue < 0)
{
    $bytevalue += 256;
}

$bytevalue %= 256;

Return

A single-character string containing the specified byte.

Examples

1

<?

$bytevalue = 97;

$return = chr($bytevalue);

echo $return;

?>

2

<?

$bytevalue = -159;

$return = chr($bytevalue);

echo $return;

?>

3

<?

$bytevalue = 353;

$return = chr($bytevalue);

echo $return;

?>

4

<?

for ($i = 0; $i <= 255; ++$i)
{
    $ctype_print = ctype_print($i);

    if ($ctype_print)
    {
        $return = chr($i);

        echo $return;
    }
}

?>

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

5

<?

$bytevalue = 27;

echo "escape: " . chr($bytevalue) . PHP_EOL;
echo sprintf("escape: %c", $bytevalue);

?>

escape: 
escape:

6

<?

echo chr(240) . chr(159) . chr(144) . chr(152);

?>

🐘

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