note 93877 deleted from reserved.variables.get by peehaa

Note Submitter: Alberto Lepe dev at alepe dot com ---- This Function will help you to manage your GET parameters to facilitate coding and prevent duplication. This is a basic version but it can be easily extended. <?php // Author: Alberto Lepe (www.alepe.com) /* Process $_GET to preserve user custom parameters * the arguments is a list of URL parameters that should be removed/changed from URL * for example: * * URL = "index.php?s=1&fi=2&m=4&p=3 * * if called: fixGet("s"); the result has to be: ?fi=2&m=4&p=3 * if called: fixGet("s&m"); the result has to be: ?fi=2&p=3 * if called: fixGet("s=4"); the result has to be: ?s=4&fi=2&m=4&p=3 * if called: fixGet("s=2&m"); the result has to be: ?s=2&fi=2&p=3 * if called: fixGet("s=&m=3"); the result has to be: ?s=&fi=2&m=3&p=3 * if called: fixGet("s=2&m="); the result has to be: ?s=2&fi=2&m=&p=3 * Special: when it ends with a =":" its to leave it open at the end * (just first occurrence) to facilitate concatenation: * if called: fixGet("s=2&m:"); the result has to be: ?s=2&fi=2&p=3&m * if called: fixGet("s=2&m:="); the result has to be: ?s=2&fi=2&p=3&m= * * Usage with HTML (using the URL example above and $id = 99): * * <a href="index.php<?php echo fixGet('m=2&s&fi:=').$id ?>" >Link</a> * Explanation: change "m" to 2, delete "s" and "fi" gets the $id value. ("p" is kept as it is not specified) * will output: <a href='index.php?m=2&p=3&fi=99'>Link</a> */ public function fixGet($args) { if(count($_GET) > 0) { if(!empty($args)) { $lastkey = ""; $pairs = explode("&",$args); foreach($pairs as $pair) { if(strpos($pair,":") !== false) { list($key,$value) = explode(":",$pair); unset($_GET[$key]); $lastkey = "&$key$value"; } elseif(strpos($pair,"=") === false) unset($_GET[$pair]); else { list($key, $value) = explode("=",$pair); $_GET[$key] = $value; } } } return "?".((count($_GET) > 0)?http_build_query($_GET).$lastkey:""); } ?> To test, copy+paste the following code into testFixGet.php <?php /* * Unit Test for fixGet() */ $cases = array ( 0 => array("s" => 1, "fi" => 2, "m" => 4, "p" => 3), 1 => array("s" => "", "fi" => "", "m" => 4, "p" => 3), ); $test[0] = array( "s" => "fi=2&m=4&p=3", "s&m" => "fi=2&p=3", "s=4" => "s=4&fi=2&m=4&p=3", "s=2&m" => "s=2&fi=2&p=3", "s=&m=3" => "s=&fi=2&m=3&p=3", "s=2&m=" => "s=2&fi=2&m=&p=3", "s=2&m:=" => "s=2&fi=2&p=3&m=", "z=9" => "s=1&fi=2&m=4&p=3&z=9", "z:" => "s=1&fi=2&m=4&p=3&z", "s:&m=3" => "fi=2&m=3&p=3&s", "s&m=3" => "fi=2&m=3&p=3", ); $test[1] = array( "s" => "fi=&m=4&p=3", "s&m" => "fi=&p=3", "s=4" => "s=4&fi=&m=4&p=3", "s=2&m" => "s=2&fi=&p=3", "s=&m=3" => "s=&fi=&m=3&p=3", "s=2&m=" => "s=2&fi=&m=&p=3", "s=2&m:=" => "s=2&fi=&p=3&m=", "z=9" => "s=&fi=&m=4&p=3&z=9", "z:" => "s=&fi=&m=4&p=3&z", ); foreach($cases as $x => $value) { echo "<hr> CASE: $x <hr>\n"; foreach($test[$x] as $arg => $expected) { $_GET = $cases[$x]; $res = myForm::fixGet($arg); echo (($res === "?".$expected)?"OK":"NG ($res)")." [$arg]<br>\n"; } } ?>