PHP Functions Essential Reference

chr

string chr(int ascii_code) 

Gets the character for a given ASCII code.

Returns:

ASCII character; NULL if the given integer is not a valid ASCII code

Description:

chr() returns the character associated with the supplied ASCII code. If the integer provided is not a valid ASCII code, the function returns nothing.

Note that the integer can be specified in octal or hex values, as well as decimal. Octal values are denoted by a leading 0 (07, 012, ...), while hex values are denoted by a leading 0x (0xFF, 0x9D, ...).

Version:

PHP 3+, PHP 4+

See also:

Other functions that deal with the ASCII value of a character:

bin2hex() 
ord() 
pack() 
printf() 
sprintf() 
unpack() 

Examples:

Add a null byte to the end of a string

$string .= chr (0);

Find the ...