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;
}