Some knowledge about PHP_PHP tutorial-PHP Tutorial-php.cn

Some knowledge about PHP_PHP tutorial

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Release： 2016-07-21 16:00:18

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1. How to configure PhpMyAdmin2.9
The configuration files of many tutorials on the Internet are for the bottom version of PhpMyAdmin. At the beginning, I didn’t even know where to put the 2.9 configuration file?
The relative address of the configuration file is: config.sample.inc.php (not this libraries/config.default.inc.php)

2. Let phpMyAdmin use the password to log in
Set the following parameters in config.inc.php:
$cfg['Servers'][$i]['auth_type'] = 'cookie';
$cfg['blowfish_secret'] = '123456' ; // Set a non-empty string at will
$cfg['DefaultLang'] = 'zh'; // Display Chinese by default, optional

3. No PHP extension setting mbstring was found, and The current system seems to be using a wide character set. There is no mbstring....Modify the php.ini file extension=php_mbsting.dll and it will take effect after restarting!

4. When PHP reads Chinese characters from the MySQL database, all question marks are displayed?
Before querying the database, use mysql_query("set names 'gb2312'");

5. Use PHP to output static pages

There are two types

One One is to use template technology, and the other is to use ob series functions. Both methods look similar, but in fact they are different.

The first one: using templates

There are currently a lot of PHP templates, including the powerful smarty and the simple and easy-to-use smarttemplate.

Each of their templates has a function to get the output content.

The way we generate static pages is to use this function.

The advantage of using this method is that the code is clearer and more readable.

Here I use smarty as an example to illustrate how to generate a static page

require('smarty/Smarty.class.php');
$t = new Smarty;
$t->assign("title","Hello World!");
$content = $t->fetch("templates/index.htm");
/ /The fetch() here is the function to get the output content. Now the $content variable is the content to be displayed
$fp = fopen("archives/2005/05/19/0001.html", "w" );
fwrite($fp, $content);
fclose($fp);
?>

Second method: Use the ob series of functions

The functions used here are mainly ob_start(), ob_end_flush(), ob_get_content(),

where ob_start() means to open the browser buffer,

After opening the buffer, all No non-file header information from the PHP program will be sent,

but will be saved in the internal buffer until you use ob_end_flush().

The most important function here is ob_get_contents(),

The function of this function is to get the contents of the buffer, which is equivalent to the fetch() above,

for the same reason. Code:

ob_start();
echo "Hello World!";
$content = ob_get_contents();//Get all the content output by the php page
$fp = fopen("0001.html", "w");
fwrite($fp, $content);
fclose($fp);
?>
6. PHP Detailed explanation of language reading database
The function of this code is:

Connect to a mysql server with url address localhost and port 3306. The account number of the mysql server is "root" and the password is "9999". There is a database ok on the mysql server, and there is a table abc in the database. Table abc has two columns in total. The column names are "id" and "name". Read out all the data in abc.

$dbh = @mysql_connect("localhost:3306","root","9999");

/* Define variables dbh, mysql_connect( ) function means to connect to the mysql database, "@" means to block error reports */

if(!$dbh){die("error");}

/* die( ) function means to send the string in the brackets to the browser and interrupt the PHP program (Script). The parameters in brackets are the string to be sent.*/

@mysql_select_db("ok", $dbh);

/* Select a database in the mysql server, the database name selected here is ok */

$q = "Select * FROM abc";

/* Define variable q, "Select * FROM abc" is a SQL statement, which means reading the data in table abc */

?>

$rs = mysql_query($q, $dbh);

/* Define variable rs, function mysql_query() Meaning: Send the query string for MySQL to perform related processing or execution. Since PHP is executed from right to left, the value of rs is the value returned by the server after running the mysql_query() function */

if (!$rs){die("Valid result!");}

echo "

";

echo "";

while($row = mysql_fetch_row($rs)) echo "";

/* Define the quantitative variable (array) row, and use the while loop to write the data one by one Come out.
The function mysql_fetch_row() means: split the query result $rs single column into array variables.
$row[0] and $row[1] can be replaced*/

echo "

IDName
$row[0]< ;/td>	$row[1]

";

?>

$rs = mysql_query($q, $dbh);

while($row = mysql_fetch_object($rs)) echo "$row->id $row->name
";

/* id and name can Change position */

?>

$rs = mysql_query($q, $dbh);

while ($row = mysql_fetch_array($rs)) echo "$row[id] $row[name]
";

/* id and name can change positions */

?>

< ?

@mysql_close($dbh);

/* Close the connection to the mysql database */

?>