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); $content = preg_replace('/<br[s/br>< ]*>(s*| )*/i','<br><br> ',$content); if (stripos($content,'<table')) { $content = preg_replace('/(<br>| |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>( |s)*([x80-xff]*)/','</table> $2',$content); $content = preg_replace('/</table>( |s|<br>)*(</?td|</?tr|</?table)/i','</table>$2',$content); } $content = preg_replace('/[center](<br>|s| )*[/center]/','',$content); if (stripos($content,'<style') !== false) { $content = preg_replace('/(s| |<br[s/br>< ]*>)*(<style.*</style>)(s| |<br[s/br>< ]*>)*/isU','$2',$content); } $content = preg_replace('/( ){4,}s*/',' ',$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; }