crc32 in PHP

PHP crc32() function is utilized to generate 32-bit Cyclic Redundancy Checksum (CRC) for a string.
PHP crc32() is usually used to validate the integrity of data being transmitted.

Syntax:

crc32(string)

Parameter Description: 

string : Required. The input string.
Tip :  many crc32 checksums will bring about negative integers, you need to utilize the "%u" formatter of sprintf() or printf() to get the string representation of the unsigned crc32 checksum.

Example:

<?php 
echo "<strong>here we will print the result of crc32() with and without the (%u) formatter :</strong><br />";
$str_name = crc32("Good Morning!");
echo 'Without %u : '. $str_name."<br />"; 
echo 'With %u : ';
printf("%u",$str_name);
?>

O/P:

here we will print the result of crc32() with and without the (%u) formatter : 

Without %u : -1046389996 

With %u : 3248577300