String Parsing?

[renneh]

Can anybody give me a link to a article on string parsing or quicky show me here?
bascially the parsing I'm after is...
posting a form, code will look up the string posted and find a value which it will then look on the right hand side for that value...
i.e.
Hello this is PHP 4.0 this is a test.

The code will look up PHP and take the value 4.0

but I want this so it will look up more then one value.

Thanks in advance.

[modify]

Since it appears that you want to only search for numbers (integers & doubles), you could do

$ray = explode(" ",$string);
$x=-1;
while($x++ != count($ray))
{
if (is_integer($ray[$x]) || is_double($ray[$x])
{
//actions go here
}
}

note: you could also do this cleaner with regular expressions.