Note: This is NOT original sudobash.net code. This has been copied over from ElectricToolBox.com, full credit goes to him/her (I couldn’t find a name anywhere).

The PHP function below gets passed in a tablename and an optional database name. If the database name is not passed in then it retrieves it using the MySQL function SELECT DATABASE(). It then queries the MySQL information schema to see if the table exists and then returns either true or false.

function table_exists($tablename, $database = false) {
if(!$database) {
$res = mysql_query("SELECT DATABASE()");
$database = mysql_result($res, 0);
}
$res = mysql_query("
SELECT COUNT(*) AS count
FROM information_schema.tables
WHERE table_schema = '$database'
AND table_name = '$tablename'
");
return mysql_result($res, 0) == 1;
}

The PHP MySQL functions are used in the above example. A database connection is assumed and there is no error checking, but you can modify it to utilise whatever database library / abstraction layer you are using in your project and improve how you see fit.

To use the function you’d do something like this:

if(table_exists('my_table_name')) {
// do something
}
else {
// do something else
}

and if you wanted to specify the database name as well (perhaps you are needing to query if the table exists in multiple databases other than the one you are currently connected to), you’d do this:

if(table_exists('my_table_name', 'my_database_name')) {
// do something
}
else {
// do something else
}

The following can be used to clear a value. I regularly use this for website search bars.

<script>
function blank(a) { if(a.value == a.defaultValue) a.value = ""; }
function unblank(a) { if(a.value == "") a.value = a.defaultValue; }
</script>
<input type="text" value="email goes here" onfocus="blank(this)" onblur="unblank(this)" />

This post was updated using code found here, which I think works a little nicer.

<?php
// The letter l (lowercase L) and the number 1
// have been removed, as they can be mistaken
// for each other.
function RandomPass() {
// Comment the first line to exclude special characters
$chars = "!@#$%^&*";
$chars .= "abcdefghijkmnopqrstuvwxyz023456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
srand((double)microtime()*1000000);
$i = 1;
$pass = '' ;
// Number of digits we'd like to have our password be
$n = 8;
while ($i < $n) {
$num = rand() % strlen($chars);
$tmp = substr($chars, $num, 1);
$pass = $pass . $tmp;
$i++;
}
return $pass;
}
// Usage
$password = RandomPass();
echo "Random password is: $password";
?>