(Pratique) Récapitulatif des fonctions courantes PHP très pratiques

Les exemples de cet article résument certaines fonctions couramment utilisées dans le développement d'applications PHP. Ces fonctions incluent les opérations sur les caractères, les opérations sur les fichiers et d'autres opérations. Elles sont partagées avec vous pour votre référence. Les détails sont les suivants :

<?php
/**
 * 获取客户端IP
 * @return [string] [description]
 */
function getClientIp() {
 $ip = NULL;
 if (isset($_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;])) {
  $arr = explode(&#39;,&#39;, $_SERVER[&#39;HTTP_X_FORWARDED_FOR&#39;]);
  $pos = array_search(&#39;unknown&#39;,$arr);
  if(false !== $pos) unset($arr[$pos]);
  $ip = trim($arr[0]);
 }elseif (isset($_SERVER[&#39;HTTP_CLIENT_IP&#39;])) {
  $ip = $_SERVER[&#39;HTTP_CLIENT_IP&#39;];
 }elseif (isset($_SERVER[&#39;REMOTE_ADDR&#39;])) {
  $ip = $_SERVER[&#39;REMOTE_ADDR&#39;];
 }
 // IP地址合法验证
 $ip = (false !== ip2long($ip)) ? $ip : &#39;0.0.0.0&#39;;
 return $ip;
}
 
/**
 * 获取在线IP
 * @return String
 */
function getOnlineIp($format=0) {
 global $S_GLOBAL;
 if(empty($S_GLOBAL[&#39;onlineip&#39;])) {
  if(getenv(&#39;HTTP_CLIENT_IP&#39;) && strcasecmp(getenv(&#39;HTTP_CLIENT_IP&#39;), &#39;unknown&#39;)) {
   $onlineip = getenv(&#39;HTTP_CLIENT_IP&#39;);
  } elseif(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;) && strcasecmp(getenv(&#39;HTTP_X_FORWARDED_FOR&#39;), &#39;unknown&#39;)) {
   $onlineip = getenv(&#39;HTTP_X_FORWARDED_FOR&#39;);
  } elseif(getenv(&#39;REMOTE_ADDR&#39;) && strcasecmp(getenv(&#39;REMOTE_ADDR&#39;), &#39;unknown&#39;)) {
   $onlineip = getenv(&#39;REMOTE_ADDR&#39;);
  } elseif(isset($_SERVER[&#39;REMOTE_ADDR&#39;]) && $_SERVER[&#39;REMOTE_ADDR&#39;] && strcasecmp($_SERVER[&#39;REMOTE_ADDR&#39;], &#39;unknown&#39;)) {
   $onlineip = $_SERVER[&#39;REMOTE_ADDR&#39;];
  }
  preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
  $S_GLOBAL[&#39;onlineip&#39;] = $onlineipmatches[0] ? $onlineipmatches[0] : &#39;unknown&#39;;
 }
 
 if($format) {
  $ips = explode(&#39;.&#39;, $S_GLOBAL[&#39;onlineip&#39;]);
  for($i=0;$i<3;$i++) {
   $ips[$i] = intval($ips[$i]);
  }
  return sprintf(&#39;%03d%03d%03d&#39;, $ips[0], $ips[1], $ips[2]);
 } else {
  return $S_GLOBAL[&#39;onlineip&#39;];
 }
}
 
 
 
/**
 * 获取url
 * @return [type] [description]
 */
function getUrl(){
 $pageURL = &#39;http&#39;;
 if (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == "on") {
 $pageURL .= "s";
 }
 $pageURL .= "://";
 if ($_SERVER["SERVER_PORT"] != "80") {
 $pageURL .= $_SERVER["HTTP_HOST"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
 } else {
 $pageURL .= $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"];
 }
 return $pageURL;
}
 
/**
 * 获取当前站点的访问路径根目录
 * @return [type] [description]
 */
function getSiteUrl() {
 $uri = $_SERVER[&#39;REQUEST_URI&#39;]?$_SERVER[&#39;REQUEST_URI&#39;]:($_SERVER[&#39;PHP_SELF&#39;]?$_SERVER[&#39;PHP_SELF&#39;]:$_SERVER[&#39;SCRIPT_NAME&#39;]);
 return &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].substr($uri, 0, strrpos($uri, &#39;/&#39;)+1);
}
 
 
 
/**
 * 字符串截取，支持中文和其他编码
 * @param [string] $str  [字符串]
 * @param integer $start [起始位置]
 * @param integer $length [截取长度]
 * @param string $charset [字符串编码]
 * @param boolean $suffix [是否有省略号]
 * @return [type]   [description]
 */
function msubstr($str, $start=0, $length=15, $charset="utf-8", $suffix=true) {
 if(function_exists("mb_substr")) {
  return mb_substr($str, $start, $length, $charset);
 } elseif(function_exists(&#39;iconv_substr&#39;)) {
  return iconv_substr($str,$start,$length,$charset);
 }
 $re[&#39;utf-8&#39;] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
 $re[&#39;gb2312&#39;] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
 $re[&#39;gbk&#39;] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
 $re[&#39;big5&#39;] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
 preg_match_all($re[$charset], $str, $match);
 $slice = join("",array_slice($match[0], $start, $length));
 if($suffix) {
  return $slice."…";
 }
 return $slice;
}
 
/**
 * php 实现js escape 函数
 * @param [type] $string [description]
 * @param string $encoding [description]
 * @return [type]   [description]
 */
function escape($string, $encoding = &#39;UTF-8&#39;){
 $return = null;
 for ($x = 0; $x < mb_strlen($string, $encoding);$x ++)
 {
 $str = mb_substr($string, $x, 1, $encoding);
 if (strlen($str) > 1) { // 多字节字符
  $return .= "%u" . strtoupper(bin2hex(mb_convert_encoding($str, &#39;UCS-2&#39;, $encoding)));
 } else {
  $return .= "%" . strtoupper(bin2hex($str));
 }
 }
 return $return;
}
/**
 * php 实现 js unescape函数
 * @param [type] $str [description]
 * @return [type]  [description]
 */
function unescape($str) {
 $str = rawurldecode($str);
 preg_match_all("/(?:%u.{4})|.{4};|&#\d+;|.+/U",$str,$r);
 $ar = $r[0];
 foreach($ar as $k=>$v) {
  if(substr($v,0,2) == "%u"){
   $ar[$k] = iconv("UCS-2","utf-8//IGNORE",pack("H4",substr($v,-4)));
  } elseif(substr($v,0,3) == "") {
   $ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,3,-1)));
  } elseif(substr($v,0,2) == "&#") {
   echo substr($v,2,-1)."";
   $ar[$k] = iconv("UCS-2","utf-8",pack("n",substr($v,2,-1)));
  }
 }
 return join("",$ar);
}
 
/**
 * 数字转人名币
 * @param [type] $num [description]
 * @return [type]  [description]
 */
function num2rmb ($num) {
 $c1 = "零壹贰叁肆伍陆柒捌玖";
 $c2 = "分角元拾佰仟万拾佰仟亿";
 $num = round($num, 2);
 $num = $num * 100;
 if (strlen($num) > 10) {
  return "oh,sorry,the number is too long!";
 }
 $i = 0;
 $c = "";
 while (1) {
  if ($i == 0) {
   $n = substr($num, strlen($num)-1, 1);
  } else {
   $n = $num % 10;
  }
  $p1 = substr($c1, 3 * $n, 3);
  $p2 = substr($c2, 3 * $i, 3);
  if ($n != &#39;0&#39; || ($n == &#39;0&#39; && ($p2 == &#39;亿&#39; || $p2 == &#39;万&#39; || $p2 == &#39;元&#39;))) {
   $c = $p1 . $p2 . $c;
  } else {
   $c = $p1 . $c;
  }
  $i = $i + 1;
  $num = $num / 10;
  $num = (int)$num;
  if ($num == 0) {
   break;
  }
 }
 $j = 0;
 $slen = strlen($c);
 while ($j < $slen) {
  $m = substr($c, $j, 6);
  if ($m == &#39;零元&#39; || $m == &#39;零万&#39; || $m == &#39;零亿&#39; || $m == &#39;零零&#39;) {
   $left = substr($c, 0, $j);
   $right = substr($c, $j + 3);
   $c = $left . $right;
   $j = $j-3;
   $slen = $slen-3;
  }
  $j = $j + 3;
 }
 if (substr($c, strlen($c)-3, 3) == &#39;零&#39;) {
  $c = substr($c, 0, strlen($c)-3);
 } // if there is a &#39;0&#39; on the end , chop it out
 return $c . "整";
}
 
/**
 * 特殊的字符
 * @param [type] $str [description]
 * @return [type]  [description]
 */
function makeSemiangle($str) {
 $arr = array(
  &#39;０&#39; => &#39;0&#39;, &#39;１&#39; => &#39;1&#39;, &#39;２&#39; => &#39;2&#39;, &#39;３&#39; => &#39;3&#39;, &#39;４&#39; => &#39;4&#39;,
  &#39;５&#39; => &#39;5&#39;, &#39;６&#39; => &#39;6&#39;, &#39;７&#39; => &#39;7&#39;, &#39;８&#39; => &#39;8&#39;, &#39;９&#39; => &#39;9&#39;,
  &#39;Ａ&#39; => &#39;A&#39;, &#39;Ｂ&#39; => &#39;B&#39;, &#39;Ｃ&#39; => &#39;C&#39;, &#39;Ｄ&#39; => &#39;D&#39;, &#39;Ｅ&#39; => &#39;E&#39;,
  &#39;Ｆ&#39; => &#39;F&#39;, &#39;Ｇ&#39; => &#39;G&#39;, &#39;Ｈ&#39; => &#39;H&#39;, &#39;Ｉ&#39; => &#39;I&#39;, &#39;Ｊ&#39; => &#39;J&#39;,
  &#39;Ｋ&#39; => &#39;K&#39;, &#39;Ｌ&#39; => &#39;L&#39;, &#39;Ｍ&#39; => &#39;M&#39;, &#39;Ｎ&#39; => &#39;N&#39;, &#39;Ｏ&#39; => &#39;O&#39;,
  &#39;Ｐ&#39; => &#39;P&#39;, &#39;Ｑ&#39; => &#39;Q&#39;, &#39;Ｒ&#39; => &#39;R&#39;, &#39;Ｓ&#39; => &#39;S&#39;, &#39;Ｔ&#39; => &#39;T&#39;,
  &#39;Ｕ&#39; => &#39;U&#39;, &#39;Ｖ&#39; => &#39;V&#39;, &#39;Ｗ&#39; => &#39;W&#39;, &#39;Ｘ&#39; => &#39;X&#39;, &#39;Ｙ&#39; => &#39;Y&#39;,
  &#39;Ｚ&#39; => &#39;Z&#39;, &#39;ａ&#39; => &#39;a&#39;, &#39;ｂ&#39; => &#39;b&#39;, &#39;ｃ&#39; => &#39;c&#39;, &#39;ｄ&#39; => &#39;d&#39;,
  &#39;ｅ&#39; => &#39;e&#39;, &#39;ｆ&#39; => &#39;f&#39;, &#39;ｇ&#39; => &#39;g&#39;, &#39;ｈ&#39; => &#39;h&#39;, &#39;ｉ&#39; => &#39;i&#39;,
  &#39;ｊ&#39; => &#39;j&#39;, &#39;ｋ&#39; => &#39;k&#39;, &#39;ｌ&#39; => &#39;l&#39;, &#39;ｍ&#39; => &#39;m&#39;, &#39;ｎ&#39; => &#39;n&#39;,
  &#39;ｏ&#39; => &#39;o&#39;, &#39;ｐ&#39; => &#39;p&#39;, &#39;ｑ&#39; => &#39;q&#39;, &#39;ｒ&#39; => &#39;r&#39;, &#39;ｓ&#39; => &#39;s&#39;,
  &#39;ｔ&#39; => &#39;t&#39;, &#39;ｕ&#39; => &#39;u&#39;, &#39;ｖ&#39; => &#39;v&#39;, &#39;ｗ&#39; => &#39;w&#39;, &#39;ｘ&#39; => &#39;x&#39;,
  &#39;ｙ&#39; => &#39;y&#39;, &#39;ｚ&#39; => &#39;z&#39;,
  &#39;（&#39; => &#39;(&#39;, &#39;）&#39; => &#39;)&#39;, &#39;〔&#39; => &#39;[&#39;, &#39;〕&#39; => &#39;]&#39;, &#39;【&#39; => &#39;[&#39;,
  &#39;】&#39; => &#39;]&#39;, &#39;〖&#39; => &#39;[&#39;, &#39;〗&#39; => &#39;]&#39;, &#39;｛&#39; => &#39;{&#39;, &#39;｝&#39; => &#39;}&#39;, &#39;《&#39; => &#39;<&#39;,
  &#39;》&#39; => &#39;>&#39;,
  &#39;％&#39; => &#39;%&#39;, &#39;＋&#39; => &#39;+&#39;, &#39;—&#39; => &#39;-&#39;, &#39;－&#39; => &#39;-&#39;, &#39;～&#39; => &#39;-&#39;,
  &#39;：&#39; => &#39;:&#39;, &#39;。&#39; => &#39;.&#39;, &#39;、&#39; => &#39;,&#39;, &#39;，&#39; => &#39;.&#39;, &#39;、&#39; => &#39;.&#39;,
  &#39;；&#39; => &#39;;&#39;, &#39;？&#39; => &#39;?&#39;, &#39;！&#39; => &#39;!&#39;, &#39;…&#39; => &#39;-&#39;, &#39;‖&#39; => &#39;|&#39;,
  &#39;”&#39; => &#39;"&#39;, &#39;“&#39; => &#39;"&#39;, &#39;&#39;&#39; => &#39;`&#39;, &#39;‘&#39; => &#39;`&#39;, &#39;｜&#39; => &#39;|&#39;, &#39;〃&#39; => &#39;"&#39;,
  &#39;　&#39; => &#39; &#39;,&#39;．&#39; => &#39;.&#39;);
 return strtr($str, $arr);
}
 
/**
 * 下载
 * @param [type] $filename [description]
 * @param string $dir  [description]
 * @return [type]   [description]
 */
function downloads($filename,$dir=&#39;./&#39;){
 $filepath = $dir.$filename;
 if (!file_exists($filepath)){
  header("Content-type: text/html; charset=utf-8");
  echo "File not found!";
  exit;
 } else {
  $file = fopen($filepath,"r");
  Header("Content-type: application/octet-stream");
  Header("Accept-Ranges: bytes");
  Header("Accept-Length: ".filesize($filepath));
  Header("Content-Disposition: attachment; filename=".$filename);
  echo fread($file, filesize($filepath));
  fclose($file);
 }
}
 
/**
 * 创建一个目录树
 * @param [type] $dir [description]
 * @param integer $mode [description]
 * @return [type]  [description]
 */
function mkdirs($dir, $mode = 0777) {
 if (!is_dir($dir)) {
  mkdirs(dirname($dir), $mode);
  return mkdir($dir, $mode);
 }
 return true;
}

Ce qui précède est un résumé (pratique) des fonctions courantes de PHP très pratiques. Pour plus de contenu connexe, veuillez faire attention au site Web PHP chinois (www.php.cn). !