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 ")
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