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105 lines
3.2 KiB
PHP
105 lines
3.2 KiB
PHP
<?php
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/**
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* @author Takashi Nojima
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* @copyright Copyright 2014, Takashi Nojima
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License v2.0
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* @package Twitter.Text
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*/
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namespace App\Util\Lexer;
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/**
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* String utility
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*
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* @author Takashi Nojima
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* @copyright Copyright 2014, Takashi Nojima
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License v2.0
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* @package Twitter
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*/
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class StringUtils
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{
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/**
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* alias of mb_substr
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*
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* @param string $str
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* @param integer $start
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* @param integer $length
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* @param string $encoding
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* @return string
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*/
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public static function substr($str, $start, $length = null, $encoding = 'UTF-8')
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{
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if (is_null($length)) {
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// for PHP <= 5.4.7
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$length = mb_strlen($str, $encoding);
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}
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return mb_substr($str, $start, $length, $encoding);
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}
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/**
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* alias of mb_strlen
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*
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* @param string $str
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* @param string $encoding
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* @return integer
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*/
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public static function strlen($str, $encoding = 'UTF-8')
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{
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return mb_strlen($str, $encoding);
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}
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/**
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* alias of mb_strpos
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*
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* @param string $haystack
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* @param string $needle
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* @param integer $offset
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* @param string $encoding
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* @return integer
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*/
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public static function strpos($haystack, $needle, $offset = 0, $encoding = 'UTF-8')
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{
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return mb_strpos($haystack, $needle, $offset, $encoding);
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}
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/**
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* A multibyte-aware substring replacement function.
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*
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* @param string $string The string to modify.
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* @param string $replacement The replacement string.
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* @param int $start The start of the replacement.
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* @param int $length The number of characters to replace.
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* @param string $encoding The encoding of the string.
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*
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* @return string The modified string.
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*
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* @see http://www.php.net/manual/en/function.substr-replace.php#90146
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*/
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public static function substrReplace($string, $replacement, $start, $length = null, $encoding = 'UTF-8')
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{
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if (extension_loaded('mbstring') === true) {
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$string_length = static::strlen($string, $encoding);
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if ($start < 0) {
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$start = max(0, $string_length + $start);
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} elseif ($start > $string_length) {
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$start = $string_length;
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}
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if ($length < 0) {
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$length = max(0, $string_length - $start + $length);
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} elseif ((is_null($length) === true) || ($length > $string_length)) {
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$length = $string_length;
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}
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if (($start + $length) > $string_length) {
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$length = $string_length - $start;
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}
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$suffixOffset = $start + $length;
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$suffixLength = $string_length - $start - $length;
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return static::substr($string, 0, $start, $encoding) . $replacement . static::substr($string, $suffixOffset, $suffixLength, $encoding);
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}
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return (is_null($length) === true) ? substr_replace($string, $replacement, $start) : substr_replace($string, $replacement, $start, $length);
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}
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}
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