/phpMyAdmin/libraries/string.lib.php
PHP | 101 lines | 64 code | 4 blank | 33 comment | 10 complexity | cec1ae8025e64828e0ae34e2c96fa2d1 MD5 | raw file
Possible License(s): LGPL-3.0, LGPL-2.0, JSON, GPL-2.0, BSD-3-Clause, LGPL-2.1, MIT
- <?php
- /* vim: set expandtab sw=4 ts=4 sts=4: */
- /**
- * Specialized String Functions for phpMyAdmin
- *
- * Copyright 2002 Robin Johnson <robbat2@users.sourceforge.net>
- * http://www.orbis-terrarum.net/?l=people.robbat2
- *
- * Defines a set of function callbacks that have a pure C version available if
- * the "ctype" extension is available, but otherwise have PHP versions to use
- * (that are slower).
- *
- * The SQL Parser code relies heavily on these functions.
- *
- * @todo a .lib filename should not have code in main(), split or rename file
- * @package PhpMyAdmin
- */
- if (! defined('PHPMYADMIN')) {
- exit;
- }
- /**
- * Load proper code for handling input.
- */
- if (@function_exists('mb_strlen')) {
- mb_internal_encoding('utf-8');
- include './libraries/string_mb.lib.php';
- } else {
- include './libraries/string_native.lib.php';
- }
- /**
- * Load ctype handler.
- */
- if (@extension_loaded('ctype')) {
- include './libraries/string_type_ctype.lib.php';
- } else {
- include './libraries/string_type_native.lib.php';
- }
- /**
- * Checks if a given character position in the string is escaped or not
- *
- * @param string string to check for
- * @param integer the character to check for
- * @param integer starting position in the string
- * @return boolean whether the character is escaped or not
- */
- function PMA_STR_charIsEscaped($string, $pos, $start = 0)
- {
- $pos = max(intval($pos), 0);
- $start = max(intval($start), 0);
- $len = PMA_strlen($string);
- // Base case:
- // Check for string length or invalid input or special case of input
- // (pos == $start)
- if ($pos <= $start || $len <= max($pos, $start)) {
- return false;
- }
- $pos--;
- $escaped = false;
- while ($pos >= $start && PMA_substr($string, $pos, 1) == '\\') {
- $escaped = !$escaped;
- $pos--;
- } // end while
- return $escaped;
- } // end of the "PMA_STR_charIsEscaped()" function
- /**
- * Checks if a number is in a range
- *
- * @param integer number to check for
- * @param integer lower bound
- * @param integer upper bound
- * @return boolean whether the number is in the range or not
- */
- function PMA_STR_numberInRangeInclusive($num, $lower, $upper)
- {
- return ($num >= $lower && $num <= $upper);
- } // end of the "PMA_STR_numberInRangeInclusive()" function
- /**
- * Checks if a character is an SQL identifier
- *
- * @param string character to check for
- * @param boolean whether the dot character is valid or not
- * @return boolean whether the character is an SQL identifier or not
- */
- function PMA_STR_isSqlIdentifier($c, $dot_is_valid = false)
- {
- return (PMA_STR_isAlnum($c)
- || ($ord_c = ord($c)) && $ord_c >= 192 && $ord_c != 215 && $ord_c != 249
- || $c == '_'
- || $c == '$'
- || ($dot_is_valid != false && $c == '.'));
- } // end of the "PMA_STR_isSqlIdentifier()" function
- ?>