php研发中实用的PHP代码片段

发布时间：2023-04-06 13:00:08 所属栏目：PHP教程来源：

导读：php开发中实用的PHP代码片段

1.关键词高亮,代码如下:

function highlight($sString, $aWords) {

if (!is_array ($aWords) || emptyempty ($aWords) || !is_string ($sString)) {

return false;

php开发中实用的PHP代码片段

1.关键词高亮,代码如下:

function highlight($sString, $aWords) {

if (!is_array ($aWords) || emptyempty ($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:

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:

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';

}

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:

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:

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:

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:

//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){

        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;

        }

    }

}

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:

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:

$i = imagecreatefromjpeg("image.jpg");

for ($x=0;$x$i);$x++) {

    for ($y=0;$y$i);$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.

// 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, 'you@youremail.com', $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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