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<?php
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// +----------------------------------------------------------------------
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// | ThinkLibrary 6.0 for ThinkPhP 6.0
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// +----------------------------------------------------------------------
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// | 版权所有 2017~2020 [ https://www.dtapp.net ]
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// +----------------------------------------------------------------------
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// | 官方网站: https://gitee.com/liguangchun/ThinkLibrary
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// +----------------------------------------------------------------------
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// | 开源协议 ( https://mit-license.org )
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// +----------------------------------------------------------------------
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// | gitee 仓库地址 ：https://gitee.com/liguangchun/ThinkLibrary
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// | github 仓库地址 ：https://github.com/GC0202/ThinkLibrary
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// | Packagist 地址 ：https://packagist.org/packages/liguangchun/think-library
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// +----------------------------------------------------------------------
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declare (strict_types=1);
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namespace DtApp\ThinkLibrary\helper;
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/**
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* 字符串管理类
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* @mixin Strings
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* @package DtApp\ThinkLibrary\helper
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*/
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class Strings
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{
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/**
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* 截取字符串前面n个字符
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* @param string $str 字符串
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* @param int $start_num 开始位置
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* @param int $end_num 多少个
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* @return string
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*/
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public function extractBefore(string $str, int $start_num, int $end_num): string
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{
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if (strlen($str) < $start_num + $end_num) {
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return $str;
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}
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return substr($str, $start_num, $end_num);
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}
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/**
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* 截取字符串最后n个字符
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* 截取字符串最后n个字符
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* @param string $str 字符串
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* @param int $num 多少个
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* @return string
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*/
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public function extractRear(string $str, int $num): string
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{
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if (strlen($str) <= $num) {
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return $str;
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}
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return substr($str, -$num);
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}
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/**
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* 过滤字符串
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* @param string $str
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* @return string
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*/
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public function filter(string $str): string
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{
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$str = str_replace(array('`', '·', '~', '!', '！', '@', '#', '$', '￥', '%', '^', '……', '&', '*', '(', ')', '（', '）', '-', '_', '——', '+', '=', '|', '\\', '[', ']', '【', '】', '{', '}', ';', '；', ':', '：', '\'', '"', '“', '”', ',', '，', '<', '>', '《', '》', '.', '。', '/', '、', '?', '？', '╮', '(', ')', 'r', 'ぷ', '〆', 'ゞ', 'ヤ', 'ゼ', 'ǎ', 'ǎ', '〆', 'む', '§', '上门'), '', $str);
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return trim($str);
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}
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/**
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* 判断字符串是否包含某个字符
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* @param $str
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* @param int $nee
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* @param string $del
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* @return bool
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*/
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public function exitContain(string $str, $nee = 3, $del = ','): bool
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{
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if (strpos($str, $del) !== false) {
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$var = explode($del, $str);
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foreach ($var as $v) {
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if ($v === $nee) {
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return true;
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}
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}
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return false;
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}
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return $str === $nee;
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}
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/**
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* 统计字符串长度
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* @param string $str 字符串
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* @return int
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*/
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public function len(string $str): int
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{
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return strlen($str);
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}
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/**
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* 字符串删除空格
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* @param $str
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* @return string|string[]
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*/
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public function trimAll($str): string
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{
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$oldchar = array(" ", " ", "\t", "\n", "\r");
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$newchar = array("", "", "", "", "");
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return str_replace($oldchar, $newchar, $str);
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}
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/**
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* 替换字符串
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* @param string $search
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* @param string $replace
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* @param string $subject
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* @return string|string[]
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*/
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public function replace(string $search, string $replace, string $subject)
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{
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return str_replace($search, $replace, $subject);
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}
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}
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