继续收藏一些PHP常用函数_php技巧

方便以后制作php程序，直接拿来就可以用了，其实一些好的函数都在一些较成熟的cms系统中都有，例如dedecms，帝国cms,phpcms等，不论是gb2312的还是utf8格式的都有。

= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59)) 
return true; 
else 
return false; 
} 
return false; 
} 
function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天 
switch ($unit) { 
case 's': 
$pidend = 1; 
break; 
case 'i': 
$pidend = 60; 
break; 
case 'h': 
$pidend = 3600; 
break; 
case 'd': 
$pidend = 86400; 
break; 
default: 
$pidend = 86400; 
} 
$time1 = strtotime($date1); 
$time2 = strtotime($date2); 
if ($time1 && $time2) 
return (float)($time1 - $time2) / $pidend; 
return false; 
} 
?>

PHP重定向 

方法一：header("Location: index.php"); 
方法二：echo "window.location ="$PHP_SELF";"; 
方法三：echo ""; 
?>

获取访问者浏览器 

获取访问者操作系统 

文件格式类 

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 'image/gif', 
'jpg' => 'image/jpeg', 
'jpeg' => 'image/jpeg', 
'jpe' => 'image/jpeg', 
'bmp' => 'image/bmp', 
'png' => 'image/png', 
'tif' => 'image/tiff', 
'tiff' => 'image/tiff', 
'pict' => 'image/x-pict', 
'pic' => 'image/x-pict', 
'pct' => 'image/x-pict', 
'tif' => 'image/tiff', 
'tiff' => 'image/tiff', 
'psd' => 'image/x-photoshop', 
'swf' => 'application/x-shockwave-flash', 
'js' => 'application/x-javascrīpt', 
'pdf' => 'application/pdf', 
'ps' => 'application/postscrīpt', 
'eps' => 'application/postscrīpt', 
'ai' => 'application/postscrīpt', 
'wmf' => 'application/x-msmetafile', 
'css' => 'text/css', 
'htm' => 'text/html', 
'html' => 'text/html', 
'txt' => 'text/plain', 
'xml' => 'text/xml', 
'wml' => 'text/wml', 
'wbmp' => 'image/vnd.wap.wbmp', 
'mid' => 'audio/midi', 
'wav' => 'audio/wav', 
'mp3' => 'audio/mpeg', 
'mp2' => 'audio/mpeg', 
'avi' => 'video/x-msvideo', 
'mpeg' => 'video/mpeg', 
'mpg' => 'video/mpeg', 
'qt' => 'video/quicktime', 
'mov' => 'video/quicktime', 
'lha' => 'application/x-lha', 
'lzh' => 'application/x-lha', 
'z' => 'application/x-compress', 
'gtar' => 'application/x-gtar', 
'gz' => 'application/x-gzip', 
'gzip' => 'application/x-gzip', 
'tgz' => 'application/x-gzip', 
'tar' => 'application/x-tar', 
'bz2' => 'application/bzip2', 
'zip' => 'application/zip', 
'arj' => 'application/x-arj', 
'rar' => 'application/x-rar-compressed', 
'hqx' => 'application/mac-binhex40', 
'sit' => 'application/x-stuffit', 
'bin' => 'application/x-macbinary', 
'uu' => 'text/x-uuencode', 
'uue' => 'text/x-uuencode', 
'latex'=> 'application/x-latex', 
'ltx' => 'application/x-latex', 
'tcl' => 'application/x-tcl', 
'pgp' => 'application/pgp', 
'asc' => 'application/pgp', 
'exe' => 'application/x-msdownload', 
'doc' => 'application/msword', 
'rtf' => 'application/rtf', 
'xls' => 'application/vnd.ms-excel', 
'ppt' => 'application/vnd.ms-powerpoint', 
'mdb' => 'application/x-msaccess', 
'wri' => 'application/x-mswrite', 
); 
?>

php生成excel文档 

时间比较问题
举一个简单例子说明:比如一个论坛对当天发表的贴子用new图片标记一下。
方法一： 

rows[$i][date]中为数据库中datetime字段值. 
$today=time(); 
$theDay=date("Y-m-d H:i:s",$today-24*3600); 
$newTag=$db->rows[$i][date]>=$theDay?"":""; 
//方法二： 
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"":""; 
?>

//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量

//读取文件函数 

//写入文件函数 

//页面快速转向 

nnn"; 
print "n"; 
print "n"; 
print "nn"; 
print "n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print "
 
n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " n"; 
print " 
页面转向提示信息
$info
n"; 
print " 如果你的浏览器不支持自动跳转,请按这里
 
n"; 
print "n"; 
exit; 
?>

产生随机字符串函数 

截取一定长度的字符串（该函数对GB2312使用有效） 

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 $length) { if($sss){ $length=$length - 3; $addstr=@# ...@#; } for($i = 0; $i < $length; $i++) { if(ord($string[$i]) > 127) { $wordscut .= $string[$i].$string[$i + 1]; $i++; } else { $wordscut .= $string[$i]; } } return $wordscut.$addstr; } return $string; } ?>

取得客户端IP地址 

判断邮箱地址 

分页（两个函数配合使用） 

".$totalpage."页 "; 
$linkNum =4; 
$start = ($page-round($linkNum/2))>0 ? ($page-round($linkNum/2)) : "1"; 
$end = ($page+round($linkNum/2))<$totalpage ? ($page+round($linkNum/2)) : $totalpage; 
$prestart=$start-1; 
$nextend=$end+1; 
if($page<>1) 
$out .= "第一页 "; 
if($start>1) 
$out.="..<< "; 
for($t=$start;$t<=$end;$t++) 
{ 
$out .= ($page==$t) ? "[".$t."] " : "$t "; 
} 
if($end<$totalpage) 
$out.=">>.."; 
if($page<>$totalpage) 
$out .= " 最后页"; 
return $out; 
} 
?>

获取新插入数据的ID 

//获得当前的脚本网址 

//把全角数字转为半角数字 

//去除HTML标记 

",">",$txt); 
$txt = preg_replace("/[rn]{1,}/isU"," 
rn",$txt); 
return $txt; 
} 
?>

//相对路径转化成绝对路径 

//取得所有链接 

"' ]+)["|']?s*[^>]*>([^>]+)/i',$code,$arr); 
return array('name'=>$arr[2],'url'=>$arr[1]); 
} 
?>

//HTML表格的每行转为CSV格式数组 

]*?>'si",'"',$table); 
$table = str_replace("",'",',$table); 
$table = str_replace("","{tr}",$table); 
//去掉 HTML 标记 
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table); 
//去掉空白字符 
$table = preg_replace("'([rn])[s]+'","",$table); 
$table = str_replace(" ","",$table); 
$table = str_replace(" ","",$table); 
$table = explode(",{tr}",$table); 
array_pop($table); 
return $table; 
} 
?>

//将HTML表格的每行每列转为数组，采集表格数据 

]*?>'si","",$table); $table = preg_replace("']*?>'si","",$table); $table = preg_replace("']*?>'si","",$table); $table = str_replace("","{tr}",$table); $table = str_replace("","{td}",$table); //去掉 HTML 标记 $table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table); //去掉空白字符 $table = preg_replace("'([rn])[s]+'","",$table); $table = str_replace(" ","",$table); $table = str_replace(" ","",$table); $table = explode('{tr}', $table); array_pop($table); foreach ($table as $key=>$tr) { $td = explode('{td}', $tr); array_pop($td); $td_array[] = $td; } return $td_array; } ?>

//返回字符串中的所有单词 $distinct=true 去除重复

//打印出为本PHP项目做出贡献的人员的清单