Oihana PHP

checksumLine.php

Table of Contents

Functions

checksumLine()  : string
Writes the line that records a file's checksum, as `sha256sum` writes it.

Functions

checksumLine()

Writes the line that records a file's checksum, as `sha256sum` writes it.

checksumLine(string $hash, string $filename) : string

The hash in lowercase, two spaces, the file name, a line feed: sha256sum -c (or md5sum -c, shasum -c…) checks it by hand, beside the file, without PHP. Give the name alone, with no directory, and the line still checks once both files are copied elsewhere.

sha256sum writes a name holding a line feed or a backslash another way (escaped, with a backslash before the line): such a name is not supported here.

Parameters
$hash : string

The checksum, hexadecimal, e.g. from fileChecksum().

$filename : string

The name of the file.

Tags
example 
use function oihana\files\checksumLine;
use function oihana\files\fileChecksum;

file_put_contents( '/data/report.pdf.sha256' , checksumLine( fileChecksum( '/data/report.pdf' ) , 'report.pdf' ) ) ;
// "<64 hexadecimal characters>  report.pdf\n" ; then `cd /data && sha256sum -c report.pdf.sha256`
see
readChecksumLine()
author

Marc Alcaraz (ekameleon)

since
1.7.0
Return values
string —

The line, ending with a line feed.

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