10个实用的PHP代码片段

关键词高亮

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', '<strong style="background-color:yellow">$1</strong>', $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 < 0 || $month_diff < 0) $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

<link href="/stylesheet.css?<?php echo time(); ?>" 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; 
}