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<?php
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<?php
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declare(strict_types=1);
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declare(strict_types=1);
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namespace ParagonIE\ConstantTime;
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namespace ParagonIE\ConstantTime;
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use TypeError;
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/**
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/**
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 *  Copyright (c) 2016 - 2018 Paragon Initiative Enterprises.
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 *  Copyright (c) 2016 - 2022 Paragon Initiative Enterprises.
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 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
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 *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
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 *
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 *
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 *  Permission is hereby granted, free of charge, to any person obtaining a copy
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 *  Permission is hereby granted, free of charge, to any person obtaining a copy
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 *  of this software and associated documentation files (the "Software"), to deal
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 *  of this software and associated documentation files (the "Software"), to deal
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 *  in the Software without restriction, including without limitation the rights
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 *  in the Software without restriction, including without limitation the rights
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     * @staticvar boolean $exists
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     * @staticvar boolean $exists
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     * @param string $str
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     * @param string $str
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     * @param int $start
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     * @param int $start
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     * @param ?int $length
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     * @param ?int $length
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     * @return string
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     * @return string
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     *
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     * @throws \TypeError
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     * @throws TypeError
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     */
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     */
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    public static function safeSubstr(
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    public static function safeSubstr(
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        string $str,
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        string $str,
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        int $start = 0,
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        int $start = 0,
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        $length = null
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        $length = null