Aplicativos em PHP/Trabalhando em PHP com/URLs

Passando Parâmetros pela URL

Primeiro (âncora)

<a href="arquivo.php?parametro1=valor1&parametro2=valor2&parametro3=valor3">Link</a>

arquivo.php
$par1=$_GET['parametro1'];
$par2=$_GET['parametro2'];
$par3=$_GET['parametro3'];

Segundo (action de form)

<form name=frm method=post action="arquivo2.php?parametro1=valor1&parametro2=valor2">
...

arquivo2.php

$par1=$_POST['parametro1'];
$par2=$_POST['parametro1'];

Terceiro (URL)

http://localhost/teste.php?parametro1=valor1

teste.php

$par1=$_GET['parametro1'];

Quarto (location no javascript)

<?php
// Já vindo de outro script, chamado via POST
$a = $_POST['a'];

?>
<script>
if(confirm("Confirma?")){
	location="vai.php?a='<?=$a?>' ";
}else{	
	location='volta.php';
}
</script>

Reconstruct URL string in PHP

 // find out the domain:
 $domain = $_SERVER['HTTP_HOST'];
 // find out the path to the current file:
 $path = $_SERVER['SCRIPT_NAME'];
 // find out the QueryString:
 $queryString = $_SERVER['QUERY_STRING'];
 // put it all together:
 $url = "http://" . $domain . $path . "?" . $queryString;
 echo "The current URL is: " . $url . "
";
 
 // An alternative way is to use REQUEST_URI instead of both
 // SCRIPT_NAME and QUERY_STRING, if you don't need them seperate:
 $url2 = "http://" . $domain . $_SERVER['REQUEST_URI'];
 echo "The alternative way: " . $url2;

Do site - http://snippets.dzone.com/posts/show/4054