PHP常用

php.ini文件配置

时间配置PRC中国

date.timezone = PRC

文件上传
file_uploads = On //支持http上传
upload_tmp_dir = //临时文件保存路径
upload_max_filesize = 2M //上传的大小限制
post_max_size = 10M //post提交的大小限制
max_file_uploads = 20 //允许一次上传的最大文件数

XDEBUG设置，函数嵌套循环次数:

报错内容：Fatal error: Maximum function nesting level of '100' reached, aborting!

解决办法

查找xdebug 找到zend_extension = “D:/wamp/bin/php/php5.3.13/zend_ext/php_xdebug-2.2.0-5.3-vc9-x86_64.dll” 这句在前面加;注视掉，在后面加上

xdebug.max_nesting_level = 500

乱码处理

防止乱码 先把utf-8转换成gb2312，copy完成后再转回utf-8
$newFile = iconv("utf-8","gb2312", $newFile);

输出字体颜色

echo '<span style="color:#F00" >字体为红色</span>';

格式化日期为时间戳

strtotime('2013-03-18')

$startTime='2013-03-18';

$endTime='2013-03-20'

$days=ceil((strtotime($endTime)-strtotime($startTime))/86400)+1 //求相差几天 60s*60min*24H

$shorStartTime=str_replace('-', '.', substr($startTime, 5)); //展示方式为03.18

<?php
//PHP计算两个时间差的方法
$startdate="2010-12-11 11:40:00";
$enddate="2012-12-12 11:45:09";
$date=floor((strtotime($enddate)-strtotime($startdate))/86400);
$hour=floor((strtotime($enddate)-strtotime($startdate))%86400/3600);
$minute=floor((strtotime($enddate)-strtotime($startdate))%86400/60);
$second=floor((strtotime($enddate)-strtotime($startdate))%86400%60);
echo $date."天<br>";
echo $hour."小时<br>";
echo $minute."分钟<br>";
echo $second."秒<br>";
?>

<?php
/**
* 时间差计算
*
* @param Timestamp $time
* @return String Time Elapsed
* @author Shelley Shyan
* @copyright http://phparch.cn (Professional PHP Architecture)
*/
function time2Units ($time)
{
$year   = floor($time / 60 / 60 / 24 / 365);
$time  -= $year * 60 * 60 * 24 * 365;
$month  = floor($time / 60 / 60 / 24 / 30);
$time  -= $month * 60 * 60 * 24 * 30;
$week   = floor($time / 60 / 60 / 24 / 7);
$time  -= $week * 60 * 60 * 24 * 7;
$day    = floor($time / 60 / 60 / 24);
$time  -= $day * 60 * 60 * 24;
$hour   = floor($time / 60 / 60);
$time  -= $hour * 60 * 60;
$minute = floor($time / 60);
$time  -= $minute * 60;
$second = $time;
$elapse = '';

$unitArr = array('年'  =>'year', '个月'=>'month',  '周'=>'week', '天'=>'day',
'小时'=>'hour', '分钟'=>'minute', '秒'=>'second'
);

foreach ( $unitArr as $cn => $u )
{
if ( $$u > 0 )
{
$elapse = $$u . $cn;
break;
}
}

return $elapse;
}

$past = 2052345678; // Some timestamp in the past
$now  = time();     // Current timestamp
$diff = $now - $past;

echo '发表于' . time2Units($diff) . '前';
?>

php字符串处理

substr_count($str,'|'); //计算某个字符在字符串中出现的次数
explode('|', $str, 2); //把一个字符以某个字符分割成几段

举例：7/3
整数部分：intval(floor(7/3))
余数部分：7%3