PHP常用函数方法常识一

> php替换多个字符串str_replace函数
echo str_replace(array("m","i"),array("n","z"),"my name is jim!")  
echo str_replace(array('m','i'),'n',"my name is jim!");
替换指定位置为*
substr_replace($phone,'****',3,4)
// 返回由所有已定义变量所组成的数组
get_defined_vars()
// 返回当前的所有常量
get_defined_constants()
// 匹配中文括号
$num='【3】,【8】,【9】,【10】';
preg_match_all('/(?<=【)[^】]+/is', $num, $team_ids_str);
print_r($team_ids_str);
// Array ( [0] => Array ( [0] => 3 [1] => 8 [2] => 9 [3] => 10 ) )
/**
 * 驼峰命名转下划线命名
 * @param $str
 * @return string
 */
function toUnderScore($str)
{
    $dstr = preg_replace_callback('/([A-Z]+)/', function ($matchs) {
        return '_' . strtolower($matchs[0]);
    }, $str);
    return trim(preg_replace('/_{2,}/', '_', $dstr), '_');
}

/*
* 判断是否微信客户端
*/
function is_weixin()
{
    if (empty($_SERVER['HTTP_USER_AGENT'])){
        return true;
    }
    $useragent = addslashes($_SERVER['HTTP_USER_AGENT']);
    if (strpos($useragent, 'MicroMessenger') === false && strpos($useragent, 'Windows Phone') === false) {
        return false;//非微信浏览器
    } else {
        return true;
    }
}

/**
 * 写入日志
 * @param string|array $values
 * @param string $dir
 * @return bool|int
 */
function write_log($values, $dir = LOG_PATH)
{
    if (is_array($values))
        $values = print_r($values, true);
    // 日志内容
    $content = '[' . date('Y-m-d H:i:s') . ']' . PHP_EOL . $values . PHP_EOL . PHP_EOL;
    try {
        // 文件路径
        $filePath = $dir . date('Ym') . '/';
        // 路径不存在则创建
        !is_dir($filePath) && mkdir($filePath, 0755, true);
        // 写入文件
        return file_put_contents($filePath . date('Ymd') . '.log', $content, FILE_APPEND);
    } catch (\Exception $e) {
        return false;
    }
}

/**
 * 将字节转换为可读文本
 * @param int $size 大小
 * @param string $delimiter 分隔符
 * @return string
 */
function format_bytes($size, $delimiter = '')
{
    $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
    for ($i = 0; $size >= 1024 && $i < 6; $i++) {
        $size /= 1024;
    }
    return round($size, 2) . $delimiter . $units[$i];
}

/**
 * 获取语义化时间
 * @param int $time 时间
 * @param int $local 本地时间
 * @return string
 */
function human_date($time, $local = null)
{
    return \fast\Date::human($time, $local);
}

/**
 * 生成hash加密的密码
 * php >=5.5
 * @param string $password
 * @return false|string|null
 */
function encryptPassword($password)
{
    return password_hash($password, PASSWORD_DEFAULT);
}

/**
 * 验证密码函数
 * php >=5.5
 * @param string $password
 * @param string $hash
 * @return bool
 */
function verifyPassword($password, $hash)
{
    return password_verify($password, $hash);
}

/**
 * curl请求指定url (get)
 * @param $url
 * @param array $data
 * @return mixed
 */
function curl($url, $data = [])
{
    // 处理get数据
    if (!empty($data)) {
        $url = $url . '?' . http_build_query($data);
    }
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_HEADER, false);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);//这个是重点。
    $result = curl_exec($curl);
    curl_close($curl);
    return $result;
}

/**
 * curl请求指定url (post)
 * @param $url
 * @param array $data
 * @return mixed
 */
function curlPost($url, $data = [])
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}
/**
 * curl自定义请求类型url (post)
 * @param $url
 * @param array $data
 * @return mixed
 */
function get_curl($url='',$data=[]){
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);// 跳过证书检查
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);// 从证书中检查SSL加密算法是否存在
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_AUTOREFERER, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $result = curl_exec($ch);
    if (curl_errno($ch)) {
        write_log(' 提交参数信息 ch:'.json_encode(curl_error($ch)));
        return curl_error($ch);
    }
    curl_close($ch);
    return $result;
}
/**
 * 数据导出到excel(csv文件)
 * @param $fileName
 * @param array $tileArray
 * @param array $dataArray
 */
function export_excel($fileName, $tileArray = [], $dataArray = [])
{
    ini_set('memory_limit', '512M');
    ini_set('max_execution_time', 0);
    ob_end_clean();
    ob_start();
    header("Content-Type: text/csv");
    header("Content-Disposition:filename=" . $fileName);
    $fp = fopen('php://output', 'w');
    fwrite($fp, chr(0xEF) . chr(0xBB) . chr(0xBF));// 转码 防止乱码(比如微信昵称)
    fputcsv($fp, $tileArray);
    $index = 0;
    foreach ($dataArray as $item) {
        if ($index == 1000) {
            $index = 0;
            ob_flush();
            flush();
        }
        $index++;
        fputcsv($fp, $item);
    }
    ob_flush();
    flush();
    ob_end_clean();
}
/**
 * 导出表格值过滤
 * @param $value
 * @return string
 */
function filterValue($value)
{
    return "\t" . $value . "\t";
}
/**
 * 隐藏敏感字符
 * @param $value
 * @return string
 */
function substr_cut($value)
{
    $strlen = mb_strlen($value, 'utf-8');
    if ($strlen <= 1) return $value;
    $firstStr = mb_substr($value, 0, 1, 'utf-8');
    $lastStr = mb_substr($value, -1, 1, 'utf-8');
    return $strlen == 2 ? $firstStr . str_repeat('*', $strlen - 1) : $firstStr . str_repeat("*", $strlen - 2) . $lastStr;
}

/**
 * 获取全局唯一标识符
 * @param bool $trim
 * @return string
 */
function getGuidV4($trim = true)
{
    // Windows
    if (function_exists('com_create_guid') === true) {
        $charid = com_create_guid();
        return $trim == true ? trim($charid, '{}') : $charid;
    }
    // OSX/Linux
    if (function_exists('openssl_random_pseudo_bytes') === true) {
        $data = openssl_random_pseudo_bytes(16);
        $data[6] = chr(ord($data[6]) & 0x0f | 0x40);    // set version to 0100
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80);    // set bits 6-7 to 10
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
    // Fallback (PHP 4.2+)
    mt_srand((double)microtime() * 10000);
    $charid = strtolower(md5(uniqid(rand(), true)));
    $hyphen = chr(45);                  // "-"
    $lbrace = $trim ? "" : chr(123);    // "{"
    $rbrace = $trim ? "" : chr(125);    // "}"
    $guidv4 = $lbrace .
        substr($charid, 0, 8) . $hyphen .
        substr($charid, 8, 4) . $hyphen .
        substr($charid, 12, 4) . $hyphen .
        substr($charid, 16, 4) . $hyphen .
        substr($charid, 20, 12) .
        $rbrace;
    return $guidv4;
}

/**
 * 左侧填充0
 * @param $value
 * @param int $padLength
 * @return string
 */
function pad_left($value, $padLength = 2)
{
    return \str_pad($value, $padLength, "0", STR_PAD_LEFT);
}

//对emoji表情转义
function emoji_encode($str)
{
    $strEncode = '';
    $length = mb_strlen($str, 'utf-8');
    for ($i = 0; $i < $length; $i++) {
        $_tmpStr = mb_substr($str, $i, 1, 'utf-8');
        if (strlen($_tmpStr) >= 4) {
            $strEncode .= '[[EMOJI:' . rawurlencode($_tmpStr) . ']]';
        } else {
            $strEncode .= $_tmpStr;
        }
    }
    return $strEncode;
}

//对emoji表情转反义
function emoji_decode($str)
{
    $strDecode = preg_replace_callback('|\[\[EMOJI:(.*?)\]\]|', function ($matches) {
        return rawurldecode($matches[1]);
    }, $str);
    return $strDecode;
}

/**
 * 过滤emoji表情
 * @param $text
 * @return null|string|string[]
 */
function filter_emoji($text)
{
    // 此处的preg_replace用于过滤emoji表情
    // 如需支持emoji表情, 需将mysql的编码改为utf8mb4
    return preg_replace('/[\xf0-\xf7].{3}/', '', $text);
}

/**
 * 根据指定长度截取字符串
 * @param $str
 * @param int $length
 * @return bool|string
 */
function str_substr($str, $length = 30)
{
    if (strlen($str) > $length) {
        $str = mb_substr($str, 0, $length, 'utf-8');
    }
    return $str;
}

/**
 * 字符串截取，支持中文和其他编码
 * @static
 * @access public
 * @param string $str 需要转换的字符串
 * @param string $start 开始位置
 * @param string $length 截取长度
 * @param string $charset 编码格式
 * @param string $suffix 截断显示字符
 * @return string
 */
function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = '')
{
    if (!$charset) {
        $charset = "utf-8";
    }
    if (function_exists("mb_substr"))
        $slice = mb_substr($str, $start, $length, $charset);
    elseif (function_exists('iconv_substr')) {
        $slice = iconv_substr($str, $start, $length, $charset);
        if (false === $slice) {
            $slice = '';
        }
    } else {
        $re['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
        $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
        $re['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
        $re['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
        preg_match_all($re[$charset], $str, $match);
        $slice = join("", array_slice($match[0], $start, $length));
    }
    return $slice . $suffix;
}

/**
 * 产生随机字串，可用来自动生成密码 默认长度6位 字母和数字混合
 * @param string $len 长度
 * @param string $type 字串类型
 * 0 字母 1 数字 其它 混合
 * @param string $addChars 额外字符
 * @return string
 */
function rand_string($len = 6, $type = '', $addChars = '')
{
    $str = '';
    switch ($type) {
        case 0:
            $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' . $addChars;
            break;
        case 1:
            $chars = str_repeat('0123456789', 3);
            break;
        case 2:
            $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' . $addChars;
            break;
        case 3:
            $chars = 'abcdefghijklmnopqrstuvwxyz' . $addChars;
            break;
        case 4:
            $chars = "们以我墙趋彼届墨碍启逆卸航衣孙龄岭骗休借" . $addChars;
            break;
        default :
            // 默认去掉了容易混淆的字符oOLl和数字01，要添加请使用addChars参数
            $chars = 'ABCDEFGHIJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789' . $addChars;
            break;
    }
    if ($len > 10) {//位数过长重复字符串一定次数
        $chars = $type == 1 ? str_repeat($chars, $len) : str_repeat($chars, 5);
    }
    if ($type != 4) {
        $chars = str_shuffle($chars);
        $str = substr($chars, 0, $len);
    } else {
        // 中文随机字
        for ($i = 0; $i < $len; $i++) {
            $str .= msubstr($chars, floor(mt_rand(0, mb_strlen($chars, 'utf-8') - 1)), 1);
        }
    }
    return $str;
}

/**
 * 二维数组取一列
 * array_column 兼容低版本php
 * (PHP < 5.5.0)
 * @param $array
 * @param $columnKey
 * @param null $indexKey
 * @return array
 */
function array_column($array, $columnKey, $indexKey = null)
{
    $result = array();
    foreach ($array as $subArray) {
        if (is_null($indexKey) && array_key_exists($columnKey, $subArray)) {
            $result[] = is_object($subArray) ? $subArray->$columnKey : $subArray[$columnKey];
        } elseif (array_key_exists($indexKey, $subArray)) {
            if (is_null($columnKey)) {
                $index = is_object($subArray) ? $subArray->$indexKey : $subArray[$indexKey];
                $result[$index] = $subArray;
            } elseif (array_key_exists($columnKey, $subArray)) {
                $index = is_object($subArray) ? $subArray->$indexKey : $subArray[$indexKey];
                $result[$index] = is_object($subArray) ? $subArray->$columnKey : $subArray[$columnKey];
            }
        }
    }
    return $result;
}