Four PHP application small function _php Tutorial

How to view the contents of a variable

There is a var_dump ($var) function in PhP4 that dumps the contents of a variable (variables of various types), except that the output of this function is not suitable for display in an HTML page. You can write a function like this:
function Dump ($var) {
echo "
";
Var_dump ($var);
echo "
";
}

Great for commissioning!

In PhP3, you can only use recursive method to dump the contents of an array, there is nothing for object. As if the Dump_array function of the previous article is such a function. :)

Second, static variables
function test ()
{
Static $s _val;
$s _val+=2;
return $s _val;
}

echo Test ();//2
echo Test ();//4
?>

Iii. a method of avoiding multiple occurrences with celebrities
#----------------Avoid the same name-------------

for ($checkname =0; $checkname < $num; $checkname + +)
{
if ($name [$checkname]== $name [$num])
{
$num--;
Break
}
}

Iv. Obtaining an extension of a file
With this small function you can:

function Fileextname ($filename)
{
$retval = "";
$pt =strrpos ($filename, ".");
if ($pt) $retval =substr ($filename, $pt +1, strlen ($filename)-$pt);
return ($retval);

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