chr

(PHP 4, PHP 5, PHP 7, PHP 8)

chrGenerate a single-byte string from a number

Description

chr(int $codepoint): string

Returns a one-character string containing the character specified by interpreting codepoint as an unsigned integer.

This can be used to create a one-character string in a single-byte encoding such as ASCII, ISO-8859, or Windows 1252, by passing the position of a desired character in the encoding's mapping table. However, note that this function is not aware of any string encoding, and in particular cannot be passed a Unicode code point value to generate a string in a multibyte encoding like UTF-8 or UTF-16.

This function complements ord().

Parameters

codepoint

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 Values

A single-character string containing the specified byte.

Changelog

Version Description
7.4.0 The function no longer silently accepts unsupported codepoints, and casts these to 0.

Examples

Example #1 chr() example

<?php
// Assumes the string will be used as ASCII or an ASCII-compatible encoding

$str "The string ends in escape: ";
$str .= chr(27); /* add an escape character at the end of $str */

/* Often this is more useful */

$str sprintf("The string ends in escape: %c"27);
?>

Example #2 Overflow behavior

<?php
echo chr(-159), chr(833), PHP_EOL;
?>

The above example will output:

aA

Example #3 Building a UTF-8 string from individual bytes

<?php
$str 
chr(240) . chr(159) . chr(144) . chr(152);
echo 
$str;
?>

The above example will output:


🐘

See Also

Here you can write a comment


Please enter at least 10 characters.
Loading... Please wait.
* Pflichtangabe
There are no comments available yet.

Definition of stored procedures - an introduction

Stored procedures are predefined SQL code blocks that are stored in a database and can be called up as required. ...

Bernie

Autor : ebiz-consult GmbH & Co. KG
Category: mySQL-Tutorials

How to effectively perform complex queries with SQL queries in MySQLi?

This MySQL tutorial explains how to efficiently perform complex SQL queries in MySQLi. We will look at various aspects of database querying and learn specific methods to fully utilise the power of MySQLi. ...

TheMax

Autor : TheMax
Category: mySQL-Tutorials

New functions in PhpStorm 2024.1 for PHP developers

PhpStorm 2024.1 offers a wide range of new features that will make the heart of every PHP developer beat faster. ...

admin

Autor : admin
Category: Software-Updates

Publish a tutorial

Share your knowledge with other developers worldwide

Share your knowledge with other developers worldwide

You are a professional in your field and want to share your knowledge, then sign up now and share it with our PHP community

learn more

Publish a tutorial