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
Example:
<?php
$crc_string = crc32('Good Morning...');
printf('%u', $crc_string);
?>Output:
1329844137
View the example in the browser
See also
Previous: count_chars
Next: crypt
PHP: Tips of the Day
Constants can be defined inside classes using a const keyword.
Example:
class Foo {
const BAR_TYPE = "bar";
// reference from inside the class using self::
public function myMethod() {
return self::BAR_TYPE;
}
}
// reference from outside the class using <ClassName>::
echo Foo::BAR_TYPE;
Output:
bar
This is useful to store types of items.
<?php
class Logger {
const LEVEL_INFO = 1;
const LEVEL_WARNING = 2;
const LEVEL_ERROR = 3;
// we can even assign the constant as a default value
public function log($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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