PHP Tips_PHP Tutorial

Get checkbox values ​​in batches with PHP

1. Naming



2. Use

When the plan is used as part of the sql instruction: if the fields participating in the control are numerical, then

if(!empty(_POST[’checkbox’])) {
expr = join(",", _POST[’checkbox’]);
sql = "select * from tbl_name where field in (expr)";
}

If the field participating in the control is numeric, then

if(!empty(_POST[’checkbox’])) {
expr = "’".join("',’", _POST[’checkbox’]).".";
sql = "select * from tbl_name where field in (expr)";
}

PHP determines whether the Form form is submitted

action=HTTP_POST_VARS["Button1"];
if(action=="submit")
{
//Perform form operations
}
else
{
//Read default value
}

PHP Get string length

strlen(myrow[1])

PHP Url redirect

Header("Location: "._SERVER["HTTP_REFERER"]);

PHP superglobal object

a = 1;
b = 2;
function Sum()
{
GLOBALS["b"] = GLOBALS["a"] + GLOBALS["b"];
}
Sum();
echo b;
?>

PHP form value

If method="get", use _GET["test"] instead of test
If method="post" use _POST["test"] instead of test

PHP gets current IP



PHP Get current time

echo date("Y-m-d G:i:s");
?>
date("Y year m month d day")
Date ("Y-n-j")