Eight tips commonly used in PHP Development _ PHP-php Tutorial

8 tips commonly used in daily PHP development. Simple and practical PHP batch obtains the checkbox value

1. name


2. use

When the plan is considered as part of an SQL command: If the field involved in the control is numeric

If (! Empty ($ _ POST ['checkbox']) {
$ Expr = join (",", $ _ POST ['checkbox']);
$ SQL = "select * from tbl_name where field in ($ expr )";
}
If the field involved in the control is numeric

If (! Empty ($ _ POST ['checkbox']) {
$ Expr = "'". join ("', '", $ _ POST ['checkbox']). ".";
$ SQL = "select * from tbl_name where field in ($ expr )";
}

PHP checks whether the Form is submitted

$ Action = $ HTTP_POST_VARS ["Button1"];
If ($ action = "submit ")
{
// Execute the form operation
}
Else
{
// Read the default value
}

PHP obtains the string length

Strlen ($ myrow [1])

PHP Url redirection

Header ("Location:". $ _ SERVER ["HTTP_REFERER"]);

PHP Super global object

$ A = 1;
$ B = 2;
Function Sum ()
{
$ GLOBALS ["B"] = $ GLOBALS ["a"] + $ GLOBALS ["B"];
}
Sum ();
Echo $ B;
?>

PHP form value

If mothod = "get", replace $ _ GET ["test"] with $ test.
If mothod = "post", replace $ _ POST ["test"] with $ test.

PHP obtains the current IP address



PHP gets the current time

Echo date ("Y-m-d G: I: s ");
?>
Date ("Y, m, d ")
Date ("Y-n-j ")