PHP

php set global variables from function

<?php 
function setGlobalVariable() {
    $GLOBALS['variable_name'] = "Some Value";
}
setGlobalVariable();
echo $variable_name;
// Outputs: Some Value

php global variable function

<?php
  $myVariable = "a";
  function changeVar($newVar) {
    global $myVariable
    $myVariable = "b";
  }
  echo $myVariable; // Should echo b
?>

how make a variable global php

$a = 1;
$b = 2;
function Sum(){
    global $a, $b; // allows access to vars outside of function
    $b = $a + $b;
} 

Sum();
echo $b; // output is 3

How to not use directly global variables in PHP

<?php
$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "Vous avez recherché $search_html.
";
echo "<a href='?search=$search_url'>Nouvelle recherche.</a>";
?>