How to Convert a String to Uppercase Using ORD() Function in PHP?

How to Convert a String to Uppercase Using ORD() Function in PHP?

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  • PHP
  • 1 min read

Here is an example how to convert a string "Kolkata" to uppercase "KOLKATA" using ord() function in PHP.

<html>
<body>
<?php
$a="kolkata";
for($i=0;$i<strlen($a);$i=$i+1)
{
$a{$i}=chr(ord($a{$i})-32);//here ord($a{$i})will return the ASCII value of ith character, and chr(ord($a{$i})-32)will return the character in UPPERCASE from an ASCII value.
//we know that the ASCII difference between the lowercase character and uppercase letter is 32.
}
echo "The string is in Uppercase:-"."<br>";
for($i=0;$i<strlen($a);$i=$i+1)
{
echo $a{$i};
}

?>
</body>
</html>

Output: The string is in Uppercase:-
KOLKATA

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