Home >Backend Development >PHP Tutorial >Comprehensive list of commonly used PHP codes (essential for beginners)_PHP tutorial
Comprehensive list of commonly used PHP codes (essential for beginners)_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:36:261034browse
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;
?>
| Other tables and outputs to be looped |