photoshop cs5 official Chinese official original download PHP answers to common frustrating questions

PHP Answers to Frequently Asked Questions
Reposted from Joy Village
In PHP 4.2 and later versions, register_global defaults to off
If you want to get the variables submitted from another page:
Method 1: Find register_global in PHP.ini and change it Set to on.
Method 2: Put this extract($_POST);extract($_GET);(note that there must be Session_Start() before extract($_SESSION)) at the front of the receiving web page.
Method 3: One by one Read variables $a=$_GET["a"];$b=$_POST["b"], etc. Although this method is troublesome, it is safer.
PHP code:
Ob_Start();
Session_Start();
Echo "

"; <br>Echo "The _GET variables obtained on this page are:"; <br>Print_R($_GET); <br>Echo "The _POST variables obtained on this page are:"; <br> Print_R($_POST); <br>Echo "The _COOKIE variables obtained on this page are:"; <br>Print_R($_COOKIE); <br>Echo "The _SESSION variables obtained on this page are:"; <br>Print_R($_SESSION); <br>Echo "

";
?>
Why when I send variables to another web page, I only get the first half, and all the ones starting with spaces are lost
PHP code:----------- -------------------------------------------------- -------------------
$Var="hello php";//Change to $Var=" hello php"; Try to get the result
$post= "receive.php?Name=".$Var;
header("location:$post");
?>
------------------ -------------------------------------------------- --------------------------
receive.php content:
PHP code:-------------------------- -------------------------------------------------- ---
Echo "

"; <br>Echo $_GET["Name"]; <br>Echo "

";
?>
-------- -------------------------------------------------- ---------------------
The correct method is:
PHP code:------------------ -------------------------------------------------- ------------
$Var="hello php";
$post= "receive.php?Name=".urlencode($Var);
header("location :$post");
?>
--------------------------------------------- ----------------------------------------
You don't need to use Urldecode on the receiving page (), variables will be automatically encoded.
Standardize your SQL statements
Add "`" in front of tables and fields, so that errors will not occur due to misuse of keywords.
Of course, I do not recommend you to use keywords.
For example
$Sql="INSERT INTO `xltxlm` (`author`, `title`, `id`, `content`, `date`) VALUES ('xltxlm', 'use`', 1, 'criterion your sql string ', '2003-07-11 00:00:00')"
How do I know what functions the system supports by default?
PHP code:
------------------ -------------------------------------------------- -----------
$arr = get_defined_functions();
Function php() {
}
echo "

"; <br>Echo "Here shows the functions supported by the system All functions, and custom functions phpn"; <br>print_r($arr); <br>echo "

";
?>
How to compare the number of days between two dates
PHP code:
---- -------------------------------------------------- --------------------------
$Date_1="2003-7-15";//It can also be:$ Date_1="2003-6-25 23:29:14";
$Date_2="1982-10-1";
$Date_List_1=explode("-",$Date_1);
$Date_List_2=explode("-" ,$Date_2);
$d1=mktime(0,0,0,$Date_List_1[1],$Date_List_1[2],$Date_List_1[0]);
$d2=mktime(0,0,0,$Date_List_2 [1],$Date_List_2[2],$Date_List_2[0]);
$Days=round(($d1-$d2)/3600/24);
Echo "I have already struggled $Days days^_^" ;
?>
What should you pay attention to when putting data into the database and taking it out to display on the page?
When entering the database
$str=addslashes($str);
$sql="insert into `tab` (`content`) values( '$str')";
When leaving the library
$str=stripslashes($str);
When displaying
$str=htmlspecialchars(nl2br($str));

The above introduces the answers to common frustrating questions about photoshop cs5 official Chinese version download in PHP, including the content of photoshop cs5 official Chinese version download. I hope it will be helpful to friends who are interested in PHP tutorials.