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Filename : text_helper.php
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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

use Config\ForeignCharacters;

// CodeIgniter Text Helpers

if (! function_exists('word_limiter')) {
    /**
     * Word Limiter
     *
     * Limits a string to X number of words.
     *
     * @param string $endChar the end character. Usually an ellipsis
     */
    function word_limiter(string $str, int $limit = 100, string $endChar = '&#8230;'): string
    {
        if (trim($str) === '') {
            return $str;
        }

        preg_match('/^\s*+(?:\S++\s*+){1,' . $limit . '}/', $str, $matches);

        if (strlen($str) === strlen($matches[0])) {
            $endChar = '';
        }

        return rtrim($matches[0]) . $endChar;
    }
}

if (! function_exists('character_limiter')) {
    /**
     * Character Limiter
     *
     * Limits the string based on the character count.  Preserves complete words
     * so the character count may not be exactly as specified.
     *
     * @param string $endChar the end character. Usually an ellipsis
     */
    function character_limiter(string $str, int $n = 500, string $endChar = '&#8230;'): string
    {
        if (mb_strlen($str) < $n) {
            return $str;
        }

        // a bit complicated, but faster than preg_replace with \s+
        $str = preg_replace('/ {2,}/', ' ', str_replace(["\r", "\n", "\t", "\x0B", "\x0C"], ' ', $str));

        if (mb_strlen($str) <= $n) {
            return $str;
        }

        $out = '';

        foreach (explode(' ', trim($str)) as $val) {
            $out .= $val . ' ';
            if (mb_strlen($out) >= $n) {
                $out = trim($out);
                break;
            }
        }

        return (mb_strlen($out) === mb_strlen($str)) ? $out : $out . $endChar;
    }
}

if (! function_exists('ascii_to_entities')) {
    /**
     * High ASCII to Entities
     *
     * Converts high ASCII text and MS Word special characters to character entities
     */
    function ascii_to_entities(string $str): string
    {
        $out = '';

        for ($i = 0, $s = strlen($str) - 1, $count = 1, $temp = []; $i <= $s; $i++) {
            $ordinal = ord($str[$i]);

            if ($ordinal < 128) {
                /*
                  If the $temp array has a value but we have moved on, then it seems only
                  fair that we output that entity and restart $temp before continuing.
                 */
                if (count($temp) === 1) {
                    $out .= '&#' . array_shift($temp) . ';';
                    $count = 1;
                }

                $out .= $str[$i];
            } else {
                if (empty($temp)) {
                    $count = ($ordinal < 224) ? 2 : 3;
                }

                $temp[] = $ordinal;

                if (count($temp) === $count) {
                    $number = ($count === 3) ? (($temp[0] % 16) * 4096) + (($temp[1] % 64) * 64) + ($temp[2] % 64) : (($temp[0] % 32) * 64) + ($temp[1] % 64);
                    $out .= '&#' . $number . ';';
                    $count = 1;
                    $temp  = [];
                }
                // If this is the last iteration, just output whatever we have
                elseif ($i === $s) {
                    $out .= '&#' . implode(';', $temp) . ';';
                }
            }
        }

        return $out;
    }
}

if (! function_exists('entities_to_ascii')) {
    /**
     * Entities to ASCII
     *
     * Converts character entities back to ASCII
     */
    function entities_to_ascii(string $str, bool $all = true): string
    {
        if (preg_match_all('/\&#(\d+)\;/', $str, $matches)) {
            for ($i = 0, $s = count($matches[0]); $i < $s; $i++) {
                $digits = $matches[1][$i];
                $out    = '';
                if ($digits < 128) {
                    $out .= chr($digits);
                } elseif ($digits < 2048) {
                    $out .= chr(192 + (($digits - ($digits % 64)) / 64)) . chr(128 + ($digits % 64));
                } else {
                    $out .= chr(224 + (($digits - ($digits % 4096)) / 4096))
                            . chr(128 + ((($digits % 4096) - ($digits % 64)) / 64))
                            . chr(128 + ($digits % 64));
                }
                $str = str_replace($matches[0][$i], $out, $str);
            }
        }

        if ($all) {
            return str_replace(
                ['&amp;', '&lt;', '&gt;', '&quot;', '&apos;', '&#45;'],
                ['&', '<', '>', '"', "'",  '-'],
                $str
            );
        }

        return $str;
    }
}

if (! function_exists('word_censor')) {
    /**
     * Word Censoring Function
     *
     * Supply a string and an array of disallowed words and any
     * matched words will be converted to #### or to the replacement
     * word you've submitted.
     *
     * @param string $str         the text string
     * @param array  $censored    the array of censored words
     * @param string $replacement the optional replacement value
     */
    function word_censor(string $str, array $censored, string $replacement = ''): string
    {
        if (empty($censored)) {
            return $str;
        }

        $str = ' ' . $str . ' ';

        // \w, \b and a few others do not match on a unicode character
        // set for performance reasons. As a result words like über
        // will not match on a word boundary. Instead, we'll assume that
        // a bad word will be bookended by any of these characters.
        $delim = '[-_\'\"`(){}<>\[\]|!?@#%&,.:;^~*+=\/ 0-9\n\r\t]';

        foreach ($censored as $badword) {
            $badword = str_replace('\*', '\w*?', preg_quote($badword, '/'));

            if ($replacement !== '') {
                $str = preg_replace(
                    "/({$delim})(" . $badword . ")({$delim})/i",
                    "\\1{$replacement}\\3",
                    $str
                );
            } elseif (preg_match_all("/{$delim}(" . $badword . "){$delim}/i", $str, $matches, PREG_PATTERN_ORDER | PREG_OFFSET_CAPTURE)) {
                $matches = $matches[1];

                for ($i = count($matches) - 1; $i >= 0; $i--) {
                    $length = strlen($matches[$i][0]);

                    $str = substr_replace(
                        $str,
                        str_repeat('#', $length),
                        $matches[$i][1],
                        $length
                    );
                }
            }
        }

        return trim($str);
    }
}

if (! function_exists('highlight_code')) {
    /**
     * Code Highlighter
     *
     * Colorizes code strings
     *
     * @param string $str the text string
     */
    function highlight_code(string $str): string
    {
        /* The highlight string function encodes and highlights
         * brackets so we need them to start raw.
         *
         * Also replace any existing PHP tags to temporary markers
         * so they don't accidentally break the string out of PHP,
         * and thus, thwart the highlighting.
         */
        $str = str_replace(
            ['&lt;', '&gt;', '<?', '?>', '<%', '%>', '\\', '</script>'],
            ['<', '>', 'phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'],
            $str
        );

        // The highlight_string function requires that the text be surrounded
        // by PHP tags, which we will remove later
        $str = highlight_string('<?php ' . $str . ' ?>', true);

        // Remove our artificially added PHP, and the syntax highlighting that came with it
        $str = preg_replace(
            [
                '/<span style="color: #([A-Z0-9]+)">&lt;\?php(&nbsp;| )/i',
                '/(<span style="color: #[A-Z0-9]+">.*?)\?&gt;<\/span>\n<\/span>\n<\/code>/is',
                '/<span style="color: #[A-Z0-9]+"\><\/span>/i',
            ],
            [
                '<span style="color: #$1">',
                "$1</span>\n</span>\n</code>",
                '',
            ],
            $str
        );

        // Replace our markers back to PHP tags.
        return str_replace(
            [
                'phptagopen',
                'phptagclose',
                'asptagopen',
                'asptagclose',
                'backslashtmp',
                'scriptclose',
            ],
            [
                '&lt;?',
                '?&gt;',
                '&lt;%',
                '%&gt;',
                '\\',
                '&lt;/script&gt;',
            ],
            $str
        );
    }
}

if (! function_exists('highlight_phrase')) {
    /**
     * Phrase Highlighter
     *
     * Highlights a phrase within a text string
     *
     * @param string $str      the text string
     * @param string $phrase   the phrase you'd like to highlight
     * @param string $tagOpen  the opening tag to precede the phrase with
     * @param string $tagClose the closing tag to end the phrase with
     */
    function highlight_phrase(string $str, string $phrase, string $tagOpen = '<mark>', string $tagClose = '</mark>'): string
    {
        return ($str !== '' && $phrase !== '') ? preg_replace('/(' . preg_quote($phrase, '/') . ')/i', $tagOpen . '\\1' . $tagClose, $str) : $str;
    }
}

if (! function_exists('convert_accented_characters')) {
    /**
     * Convert Accented Foreign Characters to ASCII
     *
     * @param string $str Input string
     */
    function convert_accented_characters(string $str): string
    {
        static $arrayFrom, $arrayTo;

        if (! is_array($arrayFrom)) {
            $config = new ForeignCharacters();

            if (empty($config->characterList) || ! is_array($config->characterList)) {
                $arrayFrom = [];
                $arrayTo   = [];

                return $str;
            }
            $arrayFrom = array_keys($config->characterList);
            $arrayTo   = array_values($config->characterList);

            unset($config);
        }

        return preg_replace($arrayFrom, $arrayTo, $str);
    }
}

if (! function_exists('word_wrap')) {
    /**
     * Word Wrap
     *
     * Wraps text at the specified character. Maintains the integrity of words.
     * Anything placed between {unwrap}{/unwrap} will not be word wrapped, nor
     * will URLs.
     *
     * @param string $str     the text string
     * @param int    $charlim = 76    the number of characters to wrap at
     */
    function word_wrap(string $str, int $charlim = 76): string
    {
        // Reduce multiple spaces
        $str = preg_replace('| +|', ' ', $str);

        // Standardize newlines
        if (strpos($str, "\r") !== false) {
            $str = str_replace(["\r\n", "\r"], "\n", $str);
        }

        // If the current word is surrounded by {unwrap} tags we'll
        // strip the entire chunk and replace it with a marker.
        $unwrap = [];

        if (preg_match_all('|\{unwrap\}(.+?)\{/unwrap\}|s', $str, $matches)) {
            for ($i = 0, $c = count($matches[0]); $i < $c; $i++) {
                $unwrap[] = $matches[1][$i];
                $str      = str_replace($matches[0][$i], '{{unwrapped' . $i . '}}', $str);
            }
        }

        // Use PHP's native function to do the initial wordwrap.
        // We set the cut flag to FALSE so that any individual words that are
        // too long get left alone. In the next step we'll deal with them.
        $str = wordwrap($str, $charlim, "\n", false);

        // Split the string into individual lines of text and cycle through them
        $output = '';

        foreach (explode("\n", $str) as $line) {
            // Is the line within the allowed character count?
            // If so we'll join it to the output and continue
            if (mb_strlen($line) <= $charlim) {
                $output .= $line . "\n";

                continue;
            }

            $temp = '';

            while (mb_strlen($line) > $charlim) {
                // If the over-length word is a URL we won't wrap it
                if (preg_match('!\[url.+\]|://|www\.!', $line)) {
                    break;
                }
                // Trim the word down
                $temp .= mb_substr($line, 0, $charlim - 1);
                $line = mb_substr($line, $charlim - 1);
            }

            // If $temp contains data it means we had to split up an over-length
            // word into smaller chunks so we'll add it back to our current line
            if ($temp !== '') {
                $output .= $temp . "\n" . $line . "\n";
            } else {
                $output .= $line . "\n";
            }
        }

        // Put our markers back
        foreach ($unwrap as $key => $val) {
            $output = str_replace('{{unwrapped' . $key . '}}', $val, $output);
        }

        // remove any trailing newline
        return rtrim($output);
    }
}

if (! function_exists('ellipsize')) {
    /**
     * Ellipsize String
     *
     * This function will strip tags from a string, split it at its max_length and ellipsize
     *
     * @param string $str       String to ellipsize
     * @param int    $maxLength Max length of string
     * @param mixed  $position  int (1|0) or float, .5, .2, etc for position to split
     * @param string $ellipsis  ellipsis ; Default '...'
     *
     * @return string Ellipsized string
     */
    function ellipsize(string $str, int $maxLength, $position = 1, string $ellipsis = '&hellip;'): string
    {
        // Strip tags
        $str = trim(strip_tags($str));

        // Is the string long enough to ellipsize?
        if (mb_strlen($str) <= $maxLength) {
            return $str;
        }

        $beg      = mb_substr($str, 0, (int) floor($maxLength * $position));
        $position = ($position > 1) ? 1 : $position;

        if ($position === 1) {
            $end = mb_substr($str, 0, -($maxLength - mb_strlen($beg)));
        } else {
            $end = mb_substr($str, -($maxLength - mb_strlen($beg)));
        }

        return $beg . $ellipsis . $end;
    }
}

if (! function_exists('strip_slashes')) {
    /**
     * Strip Slashes
     *
     * Removes slashes contained in a string or in an array
     *
     * @param mixed $str string or array
     *
     * @return mixed string or array
     */
    function strip_slashes($str)
    {
        if (! is_array($str)) {
            return stripslashes($str);
        }

        foreach ($str as $key => $val) {
            $str[$key] = strip_slashes($val);
        }

        return $str;
    }
}

if (! function_exists('strip_quotes')) {
    /**
     * Strip Quotes
     *
     * Removes single and double quotes from a string
     */
    function strip_quotes(string $str): string
    {
        return str_replace(['"', "'"], '', $str);
    }
}

if (! function_exists('quotes_to_entities')) {
    /**
     * Quotes to Entities
     *
     * Converts single and double quotes to entities
     */
    function quotes_to_entities(string $str): string
    {
        return str_replace(["\\'", '"', "'", '"'], ['&#39;', '&quot;', '&#39;', '&quot;'], $str);
    }
}

if (! function_exists('reduce_double_slashes')) {
    /**
     * Reduce Double Slashes
     *
     * Converts double slashes in a string to a single slash,
     * except those found in http://
     *
     * http://www.some-site.com//index.php
     *
     * becomes:
     *
     * http://www.some-site.com/index.php
     */
    function reduce_double_slashes(string $str): string
    {
        return preg_replace('#(^|[^:])//+#', '\\1/', $str);
    }
}

if (! function_exists('reduce_multiples')) {
    /**
     * Reduce Multiples
     *
     * Reduces multiple instances of a particular character.  Example:
     *
     * Fred, Bill,, Joe, Jimmy
     *
     * becomes:
     *
     * Fred, Bill, Joe, Jimmy
     *
     * @param string $character the character you wish to reduce
     * @param bool   $trim      TRUE/FALSE - whether to trim the character from the beginning/end
     */
    function reduce_multiples(string $str, string $character = ',', bool $trim = false): string
    {
        $str = preg_replace('#' . preg_quote($character, '#') . '{2,}#', $character, $str);

        return ($trim) ? trim($str, $character) : $str;
    }
}

if (! function_exists('random_string')) {
    /**
     * Create a Random String
     *
     * Useful for generating passwords or hashes.
     *
     * @param string $type Type of random string.  basic, alpha, alnum, numeric, nozero, md5, sha1, and crypto
     * @param int    $len  Number of characters
     */
    function random_string(string $type = 'alnum', int $len = 8): string
    {
        switch ($type) {
            case 'alnum':
            case 'numeric':
            case 'nozero':
            case 'alpha':
                switch ($type) {
                    case 'alpha':
                        $pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                        break;

                    case 'alnum':
                        $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
                        break;

                    case 'numeric':
                        $pool = '0123456789';
                        break;

                    case 'nozero':
                        $pool = '123456789';
                        break;
                }

                return substr(str_shuffle(str_repeat($pool, ceil($len / strlen($pool)))), 0, $len);

            case 'md5':
                return md5(uniqid((string) mt_rand(), true));

            case 'sha1':
                return sha1(uniqid((string) mt_rand(), true));

            case 'crypto':
                return bin2hex(random_bytes($len / 2));
        }
        // 'basic' type treated as default
        return (string) mt_rand();
    }
}

if (! function_exists('increment_string')) {
    /**
     * Add's _1 to a string or increment the ending number to allow _2, _3, etc
     *
     * @param string $str       Required
     * @param string $separator What should the duplicate number be appended with
     * @param int    $first     Which number should be used for the first dupe increment
     */
    function increment_string(string $str, string $separator = '_', int $first = 1): string
    {
        preg_match('/(.+)' . preg_quote($separator, '/') . '([0-9]+)$/', $str, $match);

        return isset($match[2]) ? $match[1] . $separator . ($match[2] + 1) : $str . $separator . $first;
    }
}

if (! function_exists('alternator')) {
    /**
     * Alternator
     *
     * Allows strings to be alternated. See docs...
     *
     * @param string ...$args (as many parameters as needed)
     */
    function alternator(...$args): string
    {
        static $i;

        if (func_num_args() === 0) {
            $i = 0;

            return '';
        }

        return $args[($i++ % count($args))];
    }
}

if (! function_exists('excerpt')) {
    /**
     * Excerpt.
     *
     * Allows to extract a piece of text surrounding a word or phrase.
     *
     * @param string $text     String to search the phrase
     * @param string $phrase   Phrase that will be searched for.
     * @param int    $radius   The amount of characters returned around the phrase.
     * @param string $ellipsis Ending that will be appended
     *
     * @return string
     *
     * If no $phrase is passed, will generate an excerpt of $radius characters
     * from the beginning of $text.
     */
    function excerpt(string $text, ?string $phrase = null, int $radius = 100, string $ellipsis = '...'): string
    {
        if (isset($phrase)) {
            $phrasePos = stripos($text, $phrase);
            $phraseLen = strlen($phrase);
        } else {
            $phrasePos = $radius / 2;
            $phraseLen = 1;
        }

        $pre = explode(' ', substr($text, 0, $phrasePos));
        $pos = explode(' ', substr($text, $phrasePos + $phraseLen));

        $prev  = ' ';
        $post  = ' ';
        $count = 0;

        foreach (array_reverse($pre) as $e) {
            if ((strlen($e) + $count + 1) < $radius) {
                $prev = ' ' . $e . $prev;
            }
            $count = ++$count + strlen($e);
        }

        $count = 0;

        foreach ($pos as $s) {
            if ((strlen($s) + $count + 1) < $radius) {
                $post .= $s . ' ';
            }
            $count = ++$count + strlen($s);
        }

        $ellPre = $phrase ? $ellipsis : '';

        return str_replace('  ', ' ', $ellPre . $prev . $phrase . $post . $ellipsis);
    }
}