72 lines
1.9 KiB
PHP
72 lines
1.9 KiB
PHP
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<?php defined('SYSPATH') OR die('No direct script access.');
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/**
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* UTF8::substr
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*
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* @package Kohana
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* @author Kohana Team
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* @copyright (c) 2007-2012 Kohana Team
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* @copyright (c) 2005 Harry Fuecks
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
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*/
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function _substr($str, $offset, $length = NULL)
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{
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if (UTF8::is_ascii($str))
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return ($length === NULL) ? substr($str, $offset) : substr($str, $offset, $length);
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// Normalize params
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$str = (string) $str;
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$strlen = UTF8::strlen($str);
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$offset = (int) ($offset < 0) ? max(0, $strlen + $offset) : $offset; // Normalize to positive offset
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$length = ($length === NULL) ? NULL : (int) $length;
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// Impossible
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if ($length === 0 OR $offset >= $strlen OR ($length < 0 AND $length <= $offset - $strlen))
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return '';
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// Whole string
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if ($offset == 0 AND ($length === NULL OR $length >= $strlen))
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return $str;
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// Build regex
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$regex = '^';
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// Create an offset expression
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if ($offset > 0)
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{
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// PCRE repeating quantifiers must be less than 65536, so repeat when necessary
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$x = (int) ($offset / 65535);
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$y = (int) ($offset % 65535);
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$regex .= ($x == 0) ? '' : ('(?:.{65535}){'.$x.'}');
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$regex .= ($y == 0) ? '' : ('.{'.$y.'}');
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}
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// Create a length expression
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if ($length === NULL)
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{
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$regex .= '(.*)'; // No length set, grab it all
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}
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// Find length from the left (positive length)
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elseif ($length > 0)
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{
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// Reduce length so that it can't go beyond the end of the string
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$length = min($strlen - $offset, $length);
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$x = (int) ($length / 65535);
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$y = (int) ($length % 65535);
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$regex .= '(';
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$regex .= ($x == 0) ? '' : ('(?:.{65535}){'.$x.'}');
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$regex .= '.{'.$y.'})';
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}
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// Find length from the right (negative length)
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else
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{
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$x = (int) (-$length / 65535);
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$y = (int) (-$length % 65535);
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$regex .= '(.*)';
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$regex .= ($x == 0) ? '' : ('(?:.{65535}){'.$x.'}');
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$regex .= '.{'.$y.'}';
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}
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preg_match('/'.$regex.'/us', $str, $matches);
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return $matches[1];
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}
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