php开发中实用的PHP代码片段

作者：袖梨 2022-06-24

1.关键词高亮

 代码如下 复制代码

function highlight($sString, $aWords) {
 if (!is_array ($aWords) || empty ($aWords) || !is_string ($sString)) {
  return false;
 }

 $sWords = implode ('|', $aWords);
  return preg_replace ('@b('.$sWords.')b@si', '$1', $sString);
}

2.获取你的Feedburner的用户

 代码如下 复制代码

function get_average_readers($feed_id,$interval = 7){
 $today = date('Y-m-d', strtotime("now"));
 $ago = date('Y-m-d', strtotime("-".$interval." days"));
 $feed_url="https://feedburner.google.com/api/awareness/1.0/GetFeedData?uri=".$feed_id."&dates=".$ago.",".$today;
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_URL, $feed_url);
 $data = curl_exec($ch);
 curl_close($ch);
 $xml = new SimpleXMLElement($data);
 $fb = $xml->feed->entry['circulation'];

 $nb = 0;
 foreach($xml->feed->children() as $circ){
  $nb += $circ['circulation'];
 }

 return round($nb/$interval);
}

3.自动生成密码

 代码如下 复制代码

function generatePassword($length=9, $strength=0) {
 $vowels = 'aeuy';
 $consonants = 'bdghjmnpqrstvz';
 if ($strength >= 1) {
  $consonants .= 'BDGHJLMNPQRSTVWXZ';
 }
 if ($strength >= 2) {
  $vowels .= "AEUY";
 }
 if ($strength >= 4) {
  $consonants .= '23456789';
 } www,111com.net
 if ($strength >= 8 ) {
  $vowels .= '@#$%';
 }

 $password = '';
 $alt = time() % 2;
 for ($i = 0; $i < $length; $i++) {
  if ($alt == 1) {
   $password .= $consonants[(rand() % strlen($consonants))];
   $alt = 0;
  } else {
   $password .= $vowels[(rand() % strlen($vowels))];
   $alt = 1;
  }
 }
 return $password;
}

4.压缩多个CSS文件

 代码如下 复制代码

header('Content-type: text/css');
ob_start("compress");
function compress($buffer) {
  /* remove comments */
  $buffer = preg_replace('!/*[^*]**+([^/][^*]**+)*/!', '', $buffer);
  /* remove tabs, spaces, newlines, etc. */
  $buffer = str_replace(array("rn", "r", "n", "t", '  ', '    ', '    '), '', $buffer);
  return $buffer;
}

/* your css files */
include('master.css');
include('typography.css');
include('grid.css');
include('print.css');
include('handheld.css');

ob_end_flush();

5.获取短网址

 代码如下 复制代码
function getTinyUrl($url) {
    return file_get_contents("http://tinyurl.com/api-create.php?url=".$url);
}

6.根据生日计算年龄

 代码如下 复制代码

function age($date){
 $year_diff = '';
 $time = strtotime($date);
 if(FALSE === $time){
  return '';
 }

 $date = date('Y-m-d', $time);
 list($year,$month,$day) = explode("-",$date);
 $year_diff = date("Y") – $year;
 $month_diff = date("m") – $month;
 $day_diff = date("d") – $day;
 if ($day_diff < 0 || $month_diff < 0) $year_diff–;

 return $year_diff;
}

7.计算执行时间

 代码如下 复制代码

//Create a variable for start time
$time_start = microtime(true);

// Place your PHP/HTML/JavaScript/CSS/Etc. Here

//Create a variable for end time
$time_end = microtime(true);
//Subtract the two times to get seconds
$time = $time_end - $time_start;

echo 'Script took '.$time.' seconds to execute';8.PHP的维护模式
function maintenance($mode = FALSE){
    if($mode){  www.111com.net

        if(basename($_SERVER['SCRIPT_FILENAME']) != 'maintenance.php'){
            header("Location: http://example.com/maintenance.php");
            exit;
        }
    }else{
        if(basename($_SERVER['SCRIPT_FILENAME']) == 'maintenance.php'){
            header("Location: http://example.com/");
            exit;
        }
    }
}


9.阻止CSS样式被缓存

 代码如下 复制代码

function make_ranked($rank) {
 $last = substr( $rank, -1 );
 $seclast = substr( $rank, -2, -1 );
 if( $last > 3 || $last == 0 ) $ext = 'th';
 else if( $last == 3 ) $ext = 'rd';
 else if( $last == 2 ) $ext = 'nd';
 else $ext = 'st';

 if( $last == 1 && $seclast == 1) $ext = 'th';
 if( $last == 2 && $seclast == 1) $ext = 'th';
 if( $last == 3 && $seclast == 1) $ext = 'th';

 return $rank.$ext;
}

通过IP判断来源


这是一个非常实用的代码片段，可以帮助你通过IP来判断访客来源。下面的方法通过接收一个参数，然后返回IP所在地点。如果没有找到，则返回UNKNOWN。

 

 代码如下 复制代码
function detect_city($ip) {
 
        $default = 'UNKNOWN';
 
        if (!is_string($ip) || strlen($ip) < 1 || $ip == '127.0.0.1' || $ip == 'localhost')
            $ip = '8.8.8.8';
 
        $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';
 
        $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
        $ch = curl_init();
 
        $curl_opt = array(
            CURLOPT_FOLLOWLOCATION  => 1,
            CURLOPT_HEADER      => 0,
            CURLOPT_RETURNTRANSFER  => 1,
            CURLOPT_USERAGENT   => $curlopt_useragent,
            CURLOPT_URL       => $url,
            CURLOPT_TIMEOUT         => 1,
            CURLOPT_REFERER         => 'http://' . $_SERVER['HTTP_HOST'],
        );
 
        curl_setopt_array($ch, $curl_opt);
 
        $content = curl_exec($ch);
 
        if (!is_null($curl_info)) {
            $curl_info = curl_getinfo($ch);
        }
 
        curl_close($ch);
 
        if ( preg_match('{
  • City : ([^<]*)
    • }i', $content, $regs) )  {
                $city = $regs[1];
            }
            if ( preg_match('{
  • State/Province : ([^<]*)
    • }i', $content, $regs) )  {
                $state = $regs[1];
            }
     
            if( $city!='' && $state!='' ){
              $location = $city . ', ' . $state;
              return $location;
            }else{
              return $default;
            }
     
        }


     判断一张图片的主色调


    下面这个代码非常实用，能帮助你判断一张图片中的主色调，你可以分析任何图片。

     

     代码如下 复制代码
    $i = imagecreatefromjpeg("image.jpg");
     
    for ($x=0;$x     for ($y=0;$y         $rgb = imagecolorat($i,$x,$y);
            $r   = ($rgb >> 16) & 0xFF;
            $g   = ($rgb >>  & 0xFF;
            $b   = $rgb & 0xFF;
     
            $rTotal += $r;
            $gTotal += $g;
            $bTotal += $b;
            $total++;
        }
    }
     
    $rAverage = round($rTotal/$total);
    $gAverage = round($gTotal/$total);
    $bAverage = round($bTotal/$total);


    不显示PHP错误而发送电子邮件取代之


    如果你不想在页面中显示PHP错误，也可以通过email来获取错误信息。下面的代码可以帮助你实现。

     

     代码如下 复制代码
     
    // Our custom error handler
    function nettuts_error_handler($number, $message, $file, $line, $vars){
        $email = "
           

    An error ($number) occurred on line
            $line and in the file: $file.
           

    $message

    ";
     
        $email .= "
    " . print_r($vars, 1) . "
    ";
     
        $headers = 'Content-type: text/html; charset=iso-8859-1' . "rn";
     
        // Email the error to someone...
        error_log($email, 1, '[email protected]', $headers);
     
        // Make sure that you decide how to respond to errors (on the user's side)
        // Either echo an error message, or kill the entire project. Up to you...
        // The code below ensures that we only "die" if the error was more than
        // just a NOTICE.
        if ( ($number !== E_NOTICE) && ($number < 2048) ) {
            die("There was an error. Please try again later.");
        }
    }
     
    // We should use our custom function to handle errors.
    set_error_handler('nettuts_error_handler');
     
    // Trigger an error... (var doesn't exist)
    echo $somevarthatdoesnotexist;

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