PHP - hash() Function

Definition and Usage

The hash() function returns a hash value for the given data based on the algorithm like (md5, sha256). The return value is a string with hexits (hexadecimal values).

Syntax

hash ( string $algo , string $data [, bool $raw_output = FALSE ] ) : string

Parameters

Sr.No	Parameter & Description
1	algo Name of the hashing algorithm. There is a big list of algorithm available with hash, some important ones are md5, sha256, etc. To get the full list of algorithms supported use the hashing function hash_algos()
2	data The data you want the hash to be generated. Please note once the hash is generated it cannot be reversed.
3	raw_output By default, the value is false and hence it returns lowercase hexits values. If the value is true, it will return raw binary data.

Sr.No

Parameter & Description

algo

Name of the hashing algorithm. There is a big list of algorithm available with hash, some important ones are md5, sha256, etc.
To get the full list of algorithms supported use the hashing function hash_algos()

data

The data you want the hash to be generated. Please note once the hash is generated it cannot be reversed.

raw_output

By default, the value is false and hence it returns lowercase hexits values. If the value is true, it will return raw binary data.

Return Values

PHP hash() function returns a string with lowercase hexits. If the raw_output is set to true, it will return raw binary data.

PHP Version

This function will work from PHP Version greater than 5.1.2.

Example 1

To generate hash value using md5 Algorithm −

Live Demo

<?php
   echo "The hash of Welcome to Tutorialspoint is - ". hash('md5', 'Welcome to Tutorialspoint');
?>

Output

This will produce the following result −

The hash of Welcome to Tutorialspoint is - 8ab923b97822bd258bf882e41de6ebff

Example 2

To generate hash value using sha256 Algorithm −

Live Demo

<?php
   echo "The hash of Welcome to Tutorialspoint is - ". hash('sha256', 'Welcome to Tutorialspoint');
?>

Output

This will produce the following result −

The hash of Welcome to Tutorialspoint is - a6baf12546b9a5cf6df9e22ae1ae310b8c56be2da2e9fd2c91c94314eb0e5a2e

Example 3

To generate hash using crc32b Algorithm −

Live Demo

<?php
   echo "The hash of Welcome to Tutorialspoint is - ". hash('crc32b', 'Welcome to Tutorialspoint');
?>

Output

This will produce the following result −

The hash of Welcome to Tutorialspoint is - cd12151c

Example 4

To generate hash with raw_output as true −

<?php
   echo "The hash of Welcome to Tutorialspoint is - ". hash('md5', 'Welcome to Tutorialspoint', true);
?>

Output

This will produce the following result −

The hash of Welcome to Tutorialspoint is - ��#�x"�%�������

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