Comprehensive list of commonly used PHP codes (essential for beginners)_PHP tutorial

1. Connect the MYSQL database code
$connec=mysql_connect("localhost","root","root") or die("Cannot connect to the database server: ".mysql_error());
mysql_select_db("liuyanben",$connec) or die ("Cannot select database: ".mysql_error());
mysql_query("set names 'gbk'");
?>

2. Read the database and implement loop output
$sql="select * from liuyan order by ly_id desc";
$conn=mysql_query($sql,$connec) ;
while($rs=mysql_fetch_array($conn)){
?>
The content of the loop...
}
?>

3. How to implement paging, including two functions and two calls
1) Two functions
//Paging function
function genpage (&$sql,$page_size=2)
{
global $prepage,$nextpage,$pages,$sums; //out param
$page = $_GET["page"];
$eachpage = $page_size;
$pagesql = strstr($sql," from ");
$pagesql = "select count(*) as ids ".$pagesql;
$conn = mysql_query( $pagesql) or die(mysql_error());
if($rs = mysql_fetch_array($conn)) $sums = $rs[0];
$pages = ceil(($sums-0.5)/$ eachpage)-1;
$pages = $pages>=0?$pages:0;
$prepage = ($page>0)?$page-1:0;
$nextpage = ($ page<$pages)?$page+1:$pages;
$startpos = $page*$eachpage;
$sql .=" limit $startpos,$eachpage ";
}
/ / Show paging
function showpage()
{
global $page,$pages,$prepage,$nextpage,$queryString; //param from genpage function
$shownum =10/2;
$startpage = ($page>=$shownum)?$page-$shownum:0;
$endpage = ($page+$shownum<=$pages)?$page+$shownum:$pages;

echo "Total".($pages+1)."Pages: ";
if($page>0)echo "Homepage";
if($startpage>0)
echo " ... ?";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i==$ page) echo " [".($i+1)."] ";
else echo " ". ($i+1)." ";
}
if($endpage<$pages)
echo "? ... ";
if($page<$pages)
echo "Last page";
}
//Show pagination with categories
function showpage1()
{
$fenlei =$_GET["fenleiid"];
global $page,$pages,$prepage,$nextpage,$queryString; //param from genpage function
$shownum =10/2;
$startpage = ($page>=$shownum)?$page-$shownum:0;
$endpage = ($page+$shownum<=$pages)?$page+$shownum:$pages;

echo " Total ".($pages+1)." pages: ";
if($page>0)echo "Homepage ";
if($startpage>0)
echo " ... ?";
for($i=$startpage;$i<=$endpage;$i++)
{
if($i== $page) echo " [".($i+1)."] ";
else echo " ".($i+1)." ";
}
if($endpage<$pages)
echo "? ... ";
if($page<$pages)
echo "Last page}
?>
2) Two Call
First
$sql="select * from liuyan order by ly_id desc";
genpage($sql); //Just add this line to the normal code It’s OK.
$conn=mysql_query($sql,$connec);
while($rs=mysql_fetch_array($conn)){
?>
Second
}
?>
showpage(); //Show page
?>
mysql_close();
?>

4. The server side includes


5. How to write a record into the database, and then Prompt and jump to the page
$ly_title=$_POST["ly_title"];
$ly_content=$_POST["ly_content"];
$ly_time=$_POST[" ly_time"];
$ly_author=$_POST["ly_author"];
$ly_email=$_POST["ly_email"];
$sql="insert into liuyan(ly_title,ly_content,ly_time,ly_author ,ly_email) values('".$ly_title."','".$ly_content."','".$ly_time."','".$ly_author."','".$ly_email."') ";
mysql_query($sql,$connec);
echo("");
?>

6. A dialog box pops up and a page jump occurs
echo("");
?>

7. Information viewing Page (conditionally read database)
1) Conditionally read database
$sql="select * from liuyan where ly_id=$_GET[id]";
$ conn=mysql_query($sql,$connec);
$rs=mysql_fetch_array($conn);
?>
2) Output a field

3) Close the database
mysql_close();
?>

8. Update a record in the database and Make prompt jump
$ly_title=$_POST["ly_title"];
$ly_content=$_POST["ly_content"];
$ly_time=$_POST["ly_time "];
$ly_author=$_POST["ly_author"];
$ly_email=$_POST["ly_email"];
$sql="update liuyan set ly_title='$ly_title',ly_content= '$ly_content',ly_time='$ly_time',ly_author='$ly_author',ly_email='$ly_email' where ly_id=$_GET[id]";
mysql_query($sql,$connec);
echo("");
?>

9. How to delete a record in the database
< ?php
$sql="delete from liuyan where ly_id=$_GET[id]";
mysql_query($sql,$connec);
echo("");
?>

10. How to log in as a member Verification
session_start();
$username=$_POST["username"];
$password=$_POST["password"];
$sql=" select * from admin where username='".$username."' && password='".$password."'";
$result=mysql_query($sql,$connec);
if($row =mysql_fetch_array($result)){
session_register("admin");
$admin=$username;
echo("");}
else
{
echo("

13. How to call the editor in PHP
1) Place the editor folder in the background management folder.
2) Use the following statements to perform the import operation.


Note: The name of the eWebEditorPHP38 editor folder.
The content in id=content is the name of the hidden field above

14. Loop output (can achieve column splitting)
1) First insert a row and a column table
$i=1;
?>

while($rs=mysql_fetch_array($conn)){
?>

if ($i % 2==0) {
echo "";
}
$i++;
}
?>



15. Bind data to the drop-down list box (and select it by default when modifying)

$sql ="select * from fenleibiao";
$conn=mysql_query($sql,$connec);
while($rs1=mysql_fetch_array($conn)){
?>
"
if ($rs["fenleiid"]==$rs1["fenleiid"]){
echo "selected" ;
}
?>>



}
?>


16. Get character length function
strlen($c)>12

17. Definition A character interception function
Usage:
function substrgb($in,$num){
$pos=0;
$out="";
while($c=substr($in,$pos,1)){
if($c=="n") break;
if(ord( $c)>128){
$out.=$c;
$pos++;
$c=substr($in,$pos,1);

$out. =$c;
}else{
$out.=$c;
}
$pos++;
if($pos>=$num) break;
}
if($out!=$in) $out = $out . "...";
return $out;
}

18. Determine whether it is a number
!is_numeric (qq)

19. Obtaining the current date in PHP technology
$ptime=date("y-m-d");

20. PHP verification program used when user registration
if ($admin=="" or (strlen($admin)>16) or (strlen($admin)<2)) {
echo "";
}
if ( $password=="" or strlen($password)>16 or strlen($password)<6) {
echo "";
}
if ($password=="") {
echo " ";
}else{
if ($password!=$password1) {
echo "";
}
}
if ($wt="") {
echo "< ;SCRIPT language=JavaScript>alert('Password question cannot be empty');";
echo "this.location.href='vbscript:history.back()';";
}
if ($da="") {
echo "";

}
if ($qq!="") {
if (!is_numeric($qq)) {
echo " ";
}
}
if ($youbian=="" or strlen($youbian)!=6) {
echo "";
}
if ($youbian!="") {
if (!is_numeric($youbian)) {
echo "";
}
}
if ($dizhi="") {
echo "";
}
if ($mail= ="") {
echo "";
}
if ($textarea=="") {
echo "";
}
if ($textarea=="" or strlen(textarea)>150) {
echo "";
}

24、对输出的内容进行判断，从而输出其它结果
if ($rs["active"]==1) {
echo "激活";
}else{
echo "禁用";
}
?>

25.字符截取函数


26.男女问题或单选带选择的
>男
>女

27.单选不带单选框的

锁定
else{?>
解锁

它的 save页是

$hy_id=$_GET['id'];
$action=$_GET['action'];
if ($action=='yes'){
$sql="update hybiao set hy_zhuangtai='锁定' where hy_id='$id'";
$query=mysql_query($sql,$connec);
echo("");
}
else{
$sql="update hybiao set hy_zhuangtai='正常' where hy_id='$id'";
$query=mysql_query($sql,$connec);
echo("");
}
mysql_close();
?>

28. 如果文字过长,则将过长的部分变成省略号显示

就是比如有一行文字，很长，表格内一行显示不下.

29.
禁止复制，鼠标拖动选取

30.大 中 小 文字的变化

需要指定大小的文字
大中小

30.添加到收藏夹和设为首页
设为首页
收藏本站

31.记录并显示网页的最后修改时间


32.节日倒计时


33.打开窗口即最大化


34.加入背景音乐
只适用于IE
对Netscape ,IE 都适用

35.滚动

滚动信息


36.防止点击空链接时，页面往往重置到页首端
代码“javascript:void(null)”代替原来的“#”标记

37.不能点右键，不用CTRL+A，不能复制作!
onkeypress="window.event.returnValue=false"
onkeydown="window.event.returnValue=false"
onkeyup="window.event.returnValue=false"
ondragstart="window.event.returnValue=false"
onselectstart="event.returnValue=false">


37.随机变换背景图象（一个可以刷新心情的特效）


38.划过链接 手型鼠标
style="cursor:hand"

39.如何关闭层

关闭层

40.[关闭窗口]

41.凹陷文字背景为灰色

怎么样，我凹下去了吧？

你不想试试吗？

www.lenvo.cn

42.给表格做链接

Other tables and outputs to be looped

43.后退&关闭窗口
后退：javascript:history.back(1)
关闭：javascript:window.close();

44.如果文字过长,则将过长的部分变成省略号显示

就是比如有一行文字，很长，表格内一行显示不下.

45. Copying is prohibited, drag the mouse to select

http://www.bkjia.com/PHPjc/322138.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322138.htmlTechArticle1. Code to connect to MYSQL database?php $connec=mysql_connect("localhost","root","root" ) or die("Unable to connect to the database server: ".mysql_error()); mysql_select_db("liuyanben",$connec)...