10 个救命的 PHP 代码片段

　　关键词高亮

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); 
} 

　　获取你的Feedburner的用户

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); 
} 

　　自动生成密码

function generatePassword($length=9, $strength=0) { 
    $vowels = 'aeuy'; 
    $consonants = 'bdghjmnpqrstvz'; 
    if ($strength >= 1) { 
        $consonants .= 'BDGHJLMNPQRSTVWXZ'; 
    } 
    if ($strength >= 2) { 
        $vowels .= "AEUY"; 
    } 
    if ($strength >= 4) { 
        $consonants .= '23456789'; 
    } 
    if ($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; 
} 

　　压缩多个CSS文件

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("\r\n", "\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(); 

　　获取短网址

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

　　根据生日计算年龄

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 $month_diff $year_diff–; 
 
    return $year_diff; 
} 

　　计算执行时间

//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'; 

　　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; 
        } 
    } 
} 

　　阻止CSS样式被缓存

"/stylesheet.css?" rel="stylesheet" type="text/css" /&glt; 

　　为数字增加 st\nd\rd 等

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; 
}