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PHP | chr() Function
  • Last Updated : 20 Aug, 2020

The chr() function is a built-in function in PHP and is used to convert a ASCII value to a character. It accepts an ASCII value as a parameter and returns a string representing a character from the specified ASCII value. The ASCII value can be specified in decimal, octal, or hex values.

  • Octal values are defined by a leading 0.
  • Hex values are defined by a leading 0x.

The ASCII values table can be referred from here.

Syntax:

string chr( $asciiVal)

Parameter: This function accepts a single parameter $asciiVal. This parameter contains a valid ASCII value. The chr() function returns the corresponding character of the ASCII value we pass to it as the parameter $asciiVal.

Return Value: The function returns the character whose ASCII value we pass.



Examples:

Input :  ASCII=35 ASCII=043 ASCII=0x23
Output : # # # 
Explanation: The decimal, octal and hex value of '#' is 
35, 043 and 0x23 respectively

Input : ASCII=48 
Output : 0 

Below programs illustrate the chr() function in PHP:

Program 1: Program to demonstrate the chr() function when different ASCII are passed but their equivalent character is same.




<?php
// PHP program to demonstrate the chr() function
  
$n1 = 35;
$n2 = 043;
$n3 = 0x23;
  
echo "The equivalent character for ASCII 35 in decimal is ";
echo chr($n1), "\n";// Decimal value
  
echo "The equivalent character for ASCII 043 in octal is ";
echo chr($n2), "\n"; // Octal value
  
echo "The equivalent character for ASCII 0x23 in hex is ";
echo chr($n3); // Hex value
  
?>

Output:

The equivalent character for ASCII 35 in decimal is #
The equivalent character for ASCII 043 in octal is #
The equivalent character for ASCII 0x23 in hex is #

Program 2: Program to demonstrate the chr() function using arrays.




<?php
// PHP program to demonstrate the chr() function
// in array 
  
$a=[48, 49, 50]; 
foreach($a as $i)
{
    echo "The character equivalent of 
                 ASCII value of ", $i, " is ";
    echo chr($i), "\n";
}
  
?>

Output:

The character equivalent of ASCII value of 48 is 0
The character equivalent of ASCII value of 49 is 1
The character equivalent of ASCII value of 50 is 2

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