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