关于php:常用的方法

判断字符串中是否蕴含某一个字符/*** Determine if a given string contains a given substring.** @param  string  $haystack* @param  string|string[]  $needles* @return bool* */public static function contains($haystack, $needles)    {        foreach ((array) $needles as $needle) {            if ($needle !== '' && mb_strpos($haystack, $needle) !== false) {                return true;            }        }        return false;    }Str::contains($keyword, ['_']

    /**     * 获取客户端IP地址     */    static public function getClientIP() {        static $ip = NULL;        if ( $ip !== NULL )            return $ip;        if ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {            $arr = explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] );            $pos = array_search( 'unknown', $arr );            if ( false !== $pos )                unset( $arr[$pos] );            $ip = trim( $arr[0] );        } elseif ( isset( $_SERVER['HTTP_CLIENT_IP'] ) ) {            $ip = $_SERVER['HTTP_CLIENT_IP'];        } elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) {            $ip = $_SERVER['REMOTE_ADDR'];        }        // IP地址非法验证        $ip = ( false !== ip2long( $ip ) ) ? $ip : '0.0.0.0';        return $ip;    }

    /**     * 验证手机号码     */    public static function mobile( $str ) {        if ( empty( $str ) ) {            return true;        }        return preg_match( '#^13[\d]{9}$|14^[0-9]\d{8}|^15[0-9]\d{8}$|^18[0-9]\d{8}$#', $str );    }

/**     * 验证身份证(中国)     */    public static function idCard( $str ) {        $str = trim( $str );        if ( empty( $str ) )            return true;        if ( preg_match( "/^([0-9]{15}|[0-9]{17}[0-9a-z])$/i", $str ) )            return true;        else            return false;    }

    /**     * 列出文件夹列表     *     * @param $dirname     * @return array     */    public static function getDir( $dirname ) {        $files = array();        if ( is_dir( $dirname ) ) {            $fileHander = opendir( $dirname );            while ( ( $file = readdir( $fileHander ) ) !== false ) {                $filepath = $dirname . '/' . $file;                if ( strcmp( $file, '.' ) == 0 || strcmp( $file, '..' ) == 0 || is_file( $filepath ) ) {                    continue;                }                $files[] =  self::autoCharset( $file, 'GBK', 'UTF8' );            }            closedir( $fileHander );        }        return $files;    }

    /**     * 获取客户端IP地址     */    static public function getClientIP() {        static $ip = NULL;        if ( $ip !== NULL )            return $ip;        if ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {            $arr = explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] );            $pos = array_search( 'unknown', $arr );            if ( false !== $pos )                unset( $arr[$pos] );            $ip = trim( $arr[0] );        } elseif ( isset( $_SERVER['HTTP_CLIENT_IP'] ) ) {            $ip = $_SERVER['HTTP_CLIENT_IP'];        } elseif ( isset( $_SERVER['REMOTE_ADDR'] ) ) {            $ip = $_SERVER['REMOTE_ADDR'];        }        // IP地址非法验证        $ip = ( false !== ip2long( $ip ) ) ? $ip : '0.0.0.0';        return $ip;    }