php常用函数归纳

php常用函数归纳：

/**
 * 截取指定长度的字符
 * @param type $string  内容
 * @param type $start 开始
 * @param type $length 长度
 * @return type
 */
function ds_substing($string, $start=0,$length=80) {
    $string = strip_tags($string);
    $string = preg_replace('/\s/', '', $string);
    return mb_substr($string, $start, $length);
}

/**
 * 获取当前域名及根路径
 * @return string
 */
function base_url()
{
    $request = Request::instance();
    $subDir = str_replace('\\', '/', dirname($request->server('PHP_SELF')));
    return $request->scheme() . '://' . $request->host() . $subDir . ($subDir === '/' ? '' : '/');
}

/**
 * 写入日志
 * @param string|array $values
 * @param string $dir
 * @return bool|int
 */
function write_log($values, $dir)
{
    if (is_array($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 = $dir . '/logs/';
        // 路径不存在则创建
        !is_dir($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;
    }
}

/**
 * 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;
}

/**
 * 多维数组合并
 * @param $array1
 * @param $array2
 * @return array
 */
function array_merge_multiple($array1, $array2)
{
    $merge = $array1 + $array2;
    $data = [];
    foreach ($merge as $key => $val) {
        if (
            isset($array1[$key])
            && is_array($array1[$key])
            && isset($array2[$key])
            && is_array($array2[$key])
        ) {
            $data[$key] = array_merge_multiple($array1[$key], $array2[$key]);
        } else {
            $data[$key] = isset($array2[$key]) ? $array2[$key] : $array1[$key];
        }
    }
    return $data;
}

/**
 * 二维数组排序
 * @param $arr
 * @param $keys
 * @param bool $desc
 * @return mixed
 */
function array_sort($arr, $keys, $desc = false)
{
    $key_value = $new_array = array();
    foreach ($arr as $k => $v) {
        $key_value[$k] = $v[$keys];
    }
    if ($desc) {
        arsort($key_value);
    } else {
        asort($key_value);
    }
    reset($key_value);
    foreach ($key_value as $k => $v) {
        $new_array[$k] = $arr[$k];
    }
    return $new_array;
}

/**
 * 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();
}

//生成XML
function makeXML($data_array){
    $content='<?xml version="1.0" encoding="utf-8"?><urlset>';
    foreach($data_array as $data){
        $content.= create_item($data);
    }
    $content.='</urlset>';
    $fp=fopen('sitemap.xml','w+');
    fwrite($fp,$content);
    fclose($fp);
}

    /**
     * 加密字符串
     * @param string $str 字符串
     * @param string $key 加密key
     * @param integer $expire 有效期（秒）
     * @return string
     * ord() 函数返回字符串的首个字符的 ASCII 值。
     */
    public static function encrypt($data,$key,$expire=0) {
        $expire = sprintf('%010d', $expire ? $expire + time():0);
        $key    =   md5($key);
        $data   =   base64_encode($expire.$data);
        $char = "";
        $str = "";
        $x=0;
        $len = strlen($data);
        $l = strlen($key);
        for ($i=0;$i< $len;$i++) {
            if ($x== $l) $x=0;
            $char   .=substr($key,$x,1);
            $x++;
        }

        for ($i=0;$i< $len;$i++) {
            $str    .=chr(ord(substr($data,$i,1))+(ord(substr($char,$i,1)))%256);
        }
        return $str;
    }

    /**
     * 解密字符串
     * @param string $str 字符串
     * @param string $key 加密key
     * @return string
     */
    public static function decrypt($data,$key) {
        $key    =   md5($key);
        $x=0;
        $len = strlen($data);
        $l = strlen($key);
        $char = "";
        $str = "";
        for ($i=0;$i< $len;$i++) {
            if ($x== $l) $x=0;
            $char   .=substr($key,$x,1);
            $x++;
        }
        for ($i=0;$i< $len;$i++) {
            if (ord(substr($data,$i,1))<ord(substr($char,$i,1))) {
                $str    .=chr((ord(substr($data,$i,1))+256)-ord(substr($char,$i,1)));
            }else{
                $str    .=chr(ord(substr($data,$i,1))-ord(substr($char,$i,1)));
            }
        }
        $data = base64_decode($str);
        $expire = substr($data,0,10);
        if($expire > 0 && $expire < time()) {
            return '';
        }
        $data   = substr($data,10);
        return $data;
    }

//模拟ip
    function get_rand_ip()
    {
      $arr_1 = array("218","218","66","66","218","218","60","60","202","204","66","66","66","59","61","60","222","221","66","59","60","60","66","218","218","62","63","64","66","66","122","211");
      $randarr= mt_rand(0,count($arr_1)-1);
      $ip1id = $arr_1[$randarr];
      $ip2id=  round(rand(600000,  2550000)  /  10000);
      $ip3id=  round(rand(600000,  2550000)  /  10000);
      $ip4id=  round(rand(600000,  2550000)  /  10000);
      return  $ip1id . "." . $ip2id . "." . $ip3id . "." . $ip4id;
    }

//爬虫函数
    function curl_get($url)
    {
        $ch = curl_init();
        if(strpos($url,'https')!==false)
        {
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 跳过证书检查
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
        }
        curl_setopt($ch, CURLOPT_URL,$url);
        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 GTB5' );//模拟浏览器
        curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-FORWARDED-FOR:8.8.8.8', 'CLIENT-IP:'.get_rand_ip())); //构造IP
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_TIMEOUT,30);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);//curl 抓取结果不直接输出
        $out = curl_exec($ch);
        curl_close($ch);
        return $out;

    }

    //过滤标签
    function content_format($content){
        $content = str_replace("'",'‘',$content);
        $content = preg_replace('/<\/?p[^>]*>/i','<br>',$content);
        $content = preg_replace('/<br[\s\/br><&nbsp;]*>(\s*|&nbsp;)*/i','<br><br>&nbsp;&nbsp;&nbsp;&nbsp;',$content);

        if (stripos($content,'<table')) {

            $content = preg_replace('/(<br>|&nbsp;|\s)*(<table[^>]*)>/iU','$2 align=center>',$content);
            $content = preg_replace('/<\/table>(<br>|\s)*/i','</table>',$content);
            $content = str_replace('tdclass','td class',$content);
            $content = str_replace('<table','<table ',$content);
            $content = str_replace('<tdcolspan','<td colspan ',$content);
            $content = preg_replace('/\[\/center\](\s|<br>)*/','[/center]',$content);
            $content = preg_replace('/<\/table>(&nbsp;|\s)*([\x80-\xff]*)/','</table>&nbsp;&nbsp;&nbsp;&nbsp;$2',$content);
            $content = preg_replace('/<\/table>(&nbsp;|\s|<br>)*(<\/?td|<\/?tr|<\/?table)/i','</table>$2',$content);
        }
        $content = preg_replace('/\[center\](<br>|\s|&nbsp;)*\[\/center\]/','',$content);

        if (stripos($content,'<style') !== false) {
            $content = preg_replace('/(\s|&nbsp;|<br[\s\/br><&nbsp;]*>)*(<style.*<\/style>)(\s|&nbsp;|<br[\s\/br><&nbsp;]*>)*/isU','$2',$content);
        }
        $content = preg_replace('/(&nbsp;){4,}\s*/','&nbsp;&nbsp;&nbsp;&nbsp;',$content);

        $content = preg_replace('/<\/?br[^>]*>/iU','<br>', $content);
        return $content;
    }

    //创建多层目录
    function mk_dir($dir)
    {
        if ('/' == DIRECTORY_SEPARATOR) {
            $dir = str_replace('\\', DIRECTORY_SEPARATOR, $dir);
        } else {
            $dir = str_replace('/', DIRECTORY_SEPARATOR, $dir);
        }
        if (substr($dir, -1) != DIRECTORY_SEPARATOR) {
            $dir = dirname($dir);
        }
        if (file_exists($dir)) {
            return true;
        }
        $dirs = explode(DIRECTORY_SEPARATOR, $dir);
        if (count($dirs)) {
            foreach ($dirs as $dir) {
                $tdir .= $dir . DIRECTORY_SEPARATOR;
                if ($tdir == DIRECTORY_SEPARATOR || preg_match('/^[a-z]:(\|\/)$/i',$tdir)) {
                    continue;
                }
                if (!file_exists($tdir)) {
                    if (!@mkdir($tdir, 0777)) {
                        return false;
                    }
                }
            }
        }
    }

    //文件扩展名
    function getFileExt($filePath)
    {
        return(trim(strtolower(substr(strrchr($filePath, '.'), 1))));
    }

    //压缩图片
    function image_png_size_add($imgsrc,$imgdst,$newwith=960,$newheight=960){
      //判断文件大小是否超过既定值，没有直接返回false
      if(!check_filesize($imgsrc,'200')) return false;
      list($width,$height,$type)=getimagesize($imgsrc);
      $scale = $width/$newwith;
      $new_width = ($scale>1?$width/$scale:$width);
      $new_height =($scale>1?$height/$scale:$height);
      switch($type){
        case 1:
          $giftype=check_gifcartoon($imgsrc);
          if($giftype){
            $image_wp=imagecreatetruecolor($new_width, $new_height);
            $image = imagecreatefromgif($imgsrc);
            imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
            imagejpeg($image_wp, $imgdst,75);
            imagedestroy($image_wp);
            return true;
          }
          break;
        case 2:
          $image_wp=imagecreatetruecolor($new_width, $new_height);
          $image = imagecreatefromjpeg($imgsrc);
          imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
          imagejpeg($image_wp, $imgdst,75);
          imagedestroy($image_wp);
          return true;
          break;
        case 3:
          $image_wp=imagecreatetruecolor($new_width, $new_height);
          $image = imagecreatefrompng($imgsrc);
          imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
          imagejpeg($image_wp, $imgdst,75);
          imagedestroy($image_wp);
          return true;
          break;
      }
    }
    //desription 判断是否文件大小是否超过既定值
    function check_filesize($url,$size='200'){
        $filemsg = get_headers($url,true);
        $filesize = intval($filemsg["Content-Length"]/1024);
        if($filesize>$size) return true;
        else return false;
    }