PHP string sha1() Function

PHP string sha1() is predefined function.It is used to calculate the SHA-1 hash of a string. It uses US secure Hash Algorithm 1. SHA-1 produces a 160-bit output called a message digest.

Note: To calculate the SHA-1 hash of a file, use the sha1_file()function.

Syntax:

Parameter	Description	Required/Optional
String	Specify string to be calculated.	required
raw	Specify hex or binary output format: TRUE - Raw 20 character binary format FALSE - Default. 40 character hex number	optional

Warning: It not recommended to use sha1 function to secure passwords, due to the fast nature of this hashing algorithm.

Example 1

<?php
$str = "Hello PHP";
echo "Your string is".$str;
echo "<br>";
echo sha1($str);
?>

Output:

Your string isHello PHP
a02e266c6f3a8ff0c4250e502828c4ebf179d252

Example 2

<?php 
$str = "Hello PHP"; 
echo "The string:".$str;
echo "<br>";
echo "TRUE - Raw 20 character binary format: ".sha1($str, TRUE);
echo "<br>";
echo "FALSE - 40 character hex number: ".sha1($str);
?>

Output:

The string: Hello PHP
TRUE - Raw 20 character binary format: ?.&lo:???%P((???y?R
FALSE - 40 character hex number: a02e266c6f3a8ff0c4250e502828c4ebf179d252

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