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PHP: crc32() function

Description

The crc32() function generates a 32-bit cyclic redundancy code (CRC) for a string.

The function is generally used to validate the integrity of data being transmitted.

Version:

(PHP 4 and above)

Syntax:

crc32(string_data)

Parameter:

Name Description Required /
Optional
Type
string_data The string data. Required String

Return values

The crc32 checksum of string_data.

Value Type: Integer.

Pictorial Presentation

php-string-crc32()

Example:

<?php
$crc_string = crc32('Good Morning...');
printf('%u', $crc_string);
?>

Output:

1329844137 

View the example in the browser

See also

PHP Function Reference

Previous: count_chars
Next: crypt



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PHP: Tips of the Day

Constants can be defined inside classes using a const keyword.

Example:

class Foo {
 const BAR_TYPE = "bar";
 // reference from inside the class using self::
 public function myMethod() {
 return self::BAR_TYPE;
 }
}
// reference from outside the class using <ClassName>::
echo Foo::BAR_TYPE;

Output:

bar

This is useful to store types of items.

<?php
class Logger {
 const LEVEL_INFO = 1;
 const LEVEL_WARNING = 2;
 const LEVEL_ERROR = 3;
 // we can even assign the constant as a default value
 public function log($message, $level = self::LEVEL_INFO) {
 echo "Message level " . $level . ": " . $message;
 }
}
$logger = new Logger();
$logger->log("Info"); // Using default value
$logger->log("Warning", $logger::LEVEL_WARNING); // Using var
$logger->log("Error", Logger::LEVEL_ERROR); // using class

Output:


 





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