w3resource

PHP: sha1() function

Description

The sha1() function is used to calculate the sha1 hash of a string.

Version:

(PHP 4 and above)

Syntax:

sha1(string1, raw_output)

Parameter:

Name Description Required /
Optional
Type
string1 The input string. Required String
raw_output If TRUE sets raw 20 characters binary format. If FALSE (default) sets raw 40 character hex number format. Optional Boolean

Return value:

Returns the sha1 hash as a string.

Value Type: String.

Example:

<?php
$str = 'Good Morning';
echo sha1($str).'<br>';
echo sha1($str,TRUE).'<br>';
?>

Output:

06e336231466d0b0573a05cbca7813444afb5b29
ã6#fаW:ËÊxDJû[)

View the example in the browser

See also

PHP Function Reference

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PHP: Tips of the Day

PHP: Using str_replace so that it only acts on the first match?

Can be done with preg_replace:

function str_replace_first($from, $to, $content)
{
    $from = '/'.preg_quote($from, '/').'/';

    return preg_replace($from, $to, $content, 1);
}

echo str_replace_first('abc', '123', 'abcdef abcdef abcdef'); 
// outputs '123def abcdef abcdef'

The magic is in the optional fourth parameter [Limit]. From the documentation:

[Limit] - The maximum possible replacements for each pattern in each subject string. Defaults to -1 (no limit).

Ref : https://bit.ly/35SCuP8