ord
(PHP 4, PHP 5, PHP 7)
ord — Convert the first byte of a string to a value between 0 and 255
Description
$string
) : int
Interprets the binary value of the first byte of
string as an unsigned integer between 0 and 255.
If the string is in a single-byte encoding, such as ASCII, ISO-8859, or Windows 1252, this is equivalent to returning the position of a character in the character set's mapping table. However, note that this function is not aware of any string encoding, and in particular will never identify a Unicode code point in a multi-byte encoding such as UTF-8 or UTF-16.
This function complements chr().
Examples
Example #1 ord() example
<?php
$str = "\n";
if (ord($str) == 10) {
echo "The first character of \$str is a line feed.\n";
}
?>
Example #2 Examining the individual bytes of a UTF-8 string
<?php
declare(encoding='UTF-8');
$str = "🐘";
for ( $pos=0; $pos < strlen($str); $pos ++ ) {
$byte = substr($str, $pos);
echo 'Byte ' . $pos . ' of $str has value ' . ord($byte) . PHP_EOL;
}
?>
The above example will output:
Byte 0 of $str has value 240
Byte 1 of $str has value 159
Byte 2 of $str has value 144
Byte 3 of $str has value 152
See Also
- chr() - Generate a single-byte string from a number
- An » ASCII-table
- mb_ord() - Get code point of character
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Document created the 30/01/2003, last modified the 26/10/2018
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References
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