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EDIT :: byte_safe_strings.php

<?php /** * Random_* Compatibility Library * for using the new PHP 7 random_* API in PHP 5 projects * * The MIT License (MIT) * * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ if (!is_callable('RandomCompat_strlen')) { if ( defined('MB_OVERLOAD_STRING') && ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING ) { /** * strlen() implementation that isn't brittle to mbstring.func_overload * * This version uses mb_strlen() in '8bit' mode to treat strings as raw * binary rather than UTF-8, ISO-8859-1, etc * * @param string $binary_string * * @throws TypeError * * @return int */ function RandomCompat_strlen($binary_string) { if (!is_string($binary_string)) { throw new TypeError( 'RandomCompat_strlen() expects a string' ); } return (int) mb_strlen($binary_string, '8bit'); } } else { /** * strlen() implementation that isn't brittle to mbstring.func_overload * * This version just used the default strlen() * * @param string $binary_string * * @throws TypeError * * @return int */ function RandomCompat_strlen($binary_string) { if (!is_string($binary_string)) { throw new TypeError( 'RandomCompat_strlen() expects a string' ); } return (int) strlen($binary_string); } } } if (!is_callable('RandomCompat_substr')) { if ( defined('MB_OVERLOAD_STRING') && ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING ) { /** * substr() implementation that isn't brittle to mbstring.func_overload * * This version uses mb_substr() in '8bit' mode to treat strings as raw * binary rather than UTF-8, ISO-8859-1, etc * * @param string $binary_string * @param int $start * @param int $length (optional) * * @throws TypeError * * @return string */ function RandomCompat_substr($binary_string, $start, $length = null) { if (!is_string($binary_string)) { throw new TypeError( 'RandomCompat_substr(): First argument should be a string' ); } if (!is_int($start)) { throw new TypeError( 'RandomCompat_substr(): Second argument should be an integer' ); } if ($length === null) { /** * mb_substr($str, 0, NULL, '8bit') returns an empty string on * PHP 5.3, so we have to find the length ourselves. */ $length = RandomCompat_strlen($binary_string) - $start; } elseif (!is_int($length)) { throw new TypeError( 'RandomCompat_substr(): Third argument should be an integer, or omitted' ); } // Consistency with PHP's behavior if ($start === RandomCompat_strlen($binary_string) && $length === 0) { return ''; } if ($start > RandomCompat_strlen($binary_string)) { return ''; } return (string) mb_substr($binary_string, $start, $length, '8bit'); } } else { /** * substr() implementation that isn't brittle to mbstring.func_overload * * This version just uses the default substr() * * @param string $binary_string * @param int $start * @param int $length (optional) * * @throws TypeError * * @return string */ function RandomCompat_substr($binary_string, $start, $length = null) { if (!is_string($binary_string)) { throw new TypeError( 'RandomCompat_substr(): First argument should be a string' ); } if (!is_int($start)) { throw new TypeError( 'RandomCompat_substr(): Second argument should be an integer' ); } if ($length !== null) { if (!is_int($length)) { throw new TypeError( 'RandomCompat_substr(): Third argument should be an integer, or omitted' ); } return (string) substr($binary_string, $start, $length); } return (string) substr($binary_string, $start); } } }

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