chunk_split - PHP code example

The PHP Function ChunkSplit

The php function chunk_split splits a string into a series of smaller parts. It doesn't alter the original string.

The PHP string function printf() is used to format and output a string in a specific way. It takes a format string as its first argument, which specifies how the output should be formatted. It also allows you to insert variables or values into the output, and it supports special strings like %s, %d, and %f that represent types of value (string, integer, and floating-point respectively).

Other useful PHP string functions include the quotemeta() function, which is used to add a backslash before any non-alphanumeric characters in a string. It is useful for ensuring that line breaks are preserved in a string, so that it will display correctly on a web page. The rtrim() function is used to remove white spaces and other predefined characters from the right side of a string.

Other string functions in PHP include the ord() function, which returns the ASCII value of a character. This can be useful when working with passwords, as it can be used to check whether a password has been cracked.

The implode() function is used to join an array of strings separated by a specified delimiter. It can be helpful when working with data that has been retrieved from a database and needs to be concatenated into a single string.

chunk_split example

        $value = trim($value);
        $header = new UnstructuredHeader('DKIM-Signature', $value);
        $headerCanonData .= rtrim($this->canonicalizeHeader($header->toString()."\r\n b=", $options['header_canon']));
        if (self::ALGO_SHA256 === $options['algorithm']) {
            if (!openssl_sign($headerCanonData, $signature, $this->key, \OPENSSL_ALGO_SHA256)) {
                throw new RuntimeException('Unable to sign DKIM hash: '.openssl_error_string());
            }
        } else {
            throw new \RuntimeException(sprintf('The "%s" DKIM signing algorithm is not supported yet.', self::ALGO_ED25519));
        }
        $header->setValue($value.' b='.trim(chunk_split(base64_encode($signature), 73, ' ')));
        $headers->add($header);

        return new Message($headers, $message->getBody());
    }

    private function canonicalizeHeader(string $header, string $headerCanon): string
    {
        if (self::CANON_RELAXED !== $headerCanon) {
            return $header."\r\n";
        }

if (0 >= $maxLineLength || 76 < $maxLineLength) {
            $maxLineLength = 76;
        }

        $encodedString = base64_encode($string);
        $firstLine = '';
        if (0 !== $firstLineOffset) {
            $firstLine = substr($encodedString, 0, $maxLineLength - $firstLineOffset)."\r\n";
            $encodedString = substr($encodedString, $maxLineLength - $firstLineOffset);
        }

        return $firstLine.trim(chunk_split($encodedString, $maxLineLength, "\r\n"));
    }
}

    public static function encodeBase64($str,
        $lineLength = self::LINELENGTH,
        $lineEnd = self::LINEEND)
    {
        return rtrim(chunk_split(base64_encode($str), $lineLength, $lineEnd));
    }

    /** * Constructor * * @param null|string $boundary * @access public * @return void */
    public function __construct($boundary = null)
    {

    private function validateSignature(
        string $signature,
        string $timestamp,
        string $payload,
        string $secret,
    ): void {
        $timestampedPayload = $timestamp.$payload;

        // Sendgrid provides the verification key as base64-encoded DER data. Openssl wants a PEM format, which is a multiline version of the base64 data.         $pemKey = "-----BEGIN PUBLIC KEY-----\n".chunk_split($secret, 64, "\n")."-----END PUBLIC KEY-----\n";

        if (!$publicKey = openssl_pkey_get_public($pemKey)) {
            throw new RejectWebhookException(406, 'Public key is wrong.');
        }

        if (1 !== openssl_verify($timestampedPayload, base64_decode($signature), $publicKey, \OPENSSL_ALGO_SHA256)) {
            throw new RejectWebhookException(406, 'Signature is wrong.');
        }
    }
}

$pdf = $canvas->get_cpdf();

        foreach ($pdf->objects as &$o) {
            if ($o['t'] === 'contents') {
                $o['c'] = str_replace($search, $replace, (string) $o['c']);
            }
        }
    }

    private function insertNullByteBeforeEachCharacter(string $string): string
    {
        return "\u{0000}" . substr(chunk_split($string, 1, "\u{0000}"), 0, -1);
    }
}

    public function encodeString($str, $encoding = self::ENCODING_BASE64)
    {
        $encoded = '';
        switch (strtolower($encoding)) {
            case static::ENCODING_BASE64:
                $encoded = chunk_split(
                    base64_encode($str),
                    static::STD_LINE_LENGTH,
                    static::$LE
                );
                break;
            case static::ENCODING_7BIT:
            case static::ENCODING_8BIT:
                $encoded = static::normalizeBreaks($str);
                //Make sure it ends with a line break                 if (substr($encoded, -(strlen(static::$LE))) !== static::$LE) {
                    $encoded .= static::$LE;
                }

    /** * Converts a binary string to an IP address * * @param string $binary * @return mixed */
    private function _toIp($binary)
    {
        $ip  = array();
        $tmp = explode(".", chunk_split($binary, 8, "."));
        for ($i = 0; $i < 4 ; $i++) {
            $ip[$i] = bindec($tmp[$i]);
        }

        return $ip;
    }

    /** * Internal method to validate the local part of the email address * * @return boolean */

/** * Creates a readable string from a minified license key. * * @return LicenseInformation */
    private function reFormatLicenseString(LicenseInformation $licenseInformation)
    {
        $license = $licenseInformation->license;

        $license = preg_replace('#--.+?--#', '', (string) $license);
        $license = (string) preg_replace('#[^A-Za-z0-9+/=]#', '', $license);
        $license = chunk_split($license, 32);
        $license = "-------- LICENSE BEGIN ---------\r\n" . $license . "--------- LICENSE END ----------\r\n";

        $licenseInformation->license = $license;

        return $licenseInformation;
    }
}

$fileContent = &$file; // buffered file         }

        // declare names on their own, to make phpcbf happy         $namesAttached = [$file, $newname];

        $this->attachments[] = [
            'name'        => $namesAttached,
            'disposition' => empty($disposition) ? 'attachment' : $disposition,
            // Can also be 'inline' Not sure if it matters             'type'      => $mime,
            'content'   => chunk_split(base64_encode($fileContent)),
            'multipart' => 'mixed',
        ];

        return $this;
    }

    /** * Set and return attachment Content-ID * Useful for attached inline pictures * * @param string $filename * * @return bool|string */

/** * Sanitizes and then splits a password into smaller chunks. * * @since 5.6.0 * * @param string $raw_password The raw application password. * @return string The chunked password. */
    public static function chunk_password( $raw_password ) {
        $raw_password = preg_replace( '/[^a-z\d]/i', '', $raw_password );

        return trim( chunk_split( $raw_password, 4, ' ' ) );
    }
}