Summary of several practical custom functions in PHP, summary of PHP custom functions_PHP tutorial

A summary of several practical custom functions in PHP, a summary of PHP custom functions

The examples in this article summarize several practical custom functions in PHP. Share it with everyone for your reference, the details are as follows:

I was looking at the code recently and found that the following are several practical functions.

1. Get the client IP

function getOnlineIp() {
  $strOnlineIp = "";
  if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
    $onlineip = getenv('HTTP_CLIENT_IP');
  } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
    $onlineip = getenv('HTTP_X_FORWARDED_FOR');
  } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
    $onlineip = getenv('REMOTE_ADDR');
  } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
    $onlineip = $_SERVER['REMOTE_ADDR'];
  }
  preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
  $strOnlineIp = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
  return $strOnlineIp;
}

Here, if users use multi-level proxies, the real IP cannot be obtained.

2. String interception, supports Chinese

function getStrTruncate($string, $length = 80, $etc = ''){
  if ($length == 0) return '';
  mb_internal_encoding("UTF-8");
  $string = str_replace("\n","",$string);
  $strlen = mb_strwidth($string);
  if ($strlen > $length) {
    $etclen = mb_strwidth($etc);
    $length = $length - $etclen;
    $str=''; $n = 0;
    for($i=0; $i<$length; $i++) {
      $c = mb_substr($string, $i, 1);
      $n += mb_strwidth($c);
      if ($n>$length) { break; }
      $str .= $c;
    }
    return $str.$etc;
  } else {
    return $string;
  }
}
echo getStrTruncate("海底苍鹰博客",7); //结果是海底苍，utf8一个汉字对应二个字符

3. The time function of how long ago it was, commonly used in forums and blogs

function timeFromNow($dateline) {
  if(emptyempty($dateline)) return false;
  $seconds = time() - $dateline;
  if ($seconds < 60){
    return "1分钟前";
  }elseif($seconds < 3600){
    return floor($seconds/60)."分钟前";
  }elseif($seconds < 24*3600){
    return floor($seconds/3600)."小时前";
  }elseif($seconds < 48*3600){
    return date("昨天 H:i", $dateline)."";
  }else{
    return date('Y-m-d', $dateline);
  }
}
echo timeFromNow(strtotime("2012-07-07 14:15:13")); //昨天 14:15
echo timeFromNow(strtotime("2012-07-08 14:15:13")); //1小前

4. Filter some tags

function delTags($str)
{
  $farr = array(
  "/<(\/&#63;)(script|i&#63;frame|style|html|body|title|link|meta|form|input|embed|object|textarea|\&#63;|\%)([^>]*&#63;)>/isU",
  "/(<[^>]*)on[a-zA-Z]+\s*=([^>]*>)/isU"
  );
  $tarr = array(
  "",
  ""
  );
  $str = preg_replace( $farr,$tarr,$str);
  return $str;
}
$str = "<a href='#'>asdfasdfsd</a>====<script>alert(1111)</script>";
echo delTags($str);  //结果：<a href='#'>asdfasdfsd</a>====alert(1111)
echo strip_tags($str); //结果：sdfasdfsd====alert(1111)

If you want to filter all tags strip_tags is enough.

Readers who are interested in more PHP-related content can check out the special topics of this site: "Introduction Tutorial on PHP Basic Syntax", "Introduction Tutorial on PHP Object-Oriented Programming" and "Summary of Common PHP Functions and Techniques"

I hope this article will be helpful to everyone in PHP programming.

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