whats the different from include and require?

i know the include can return value and the require cant.is any other different between them??

 

www.php.net/require

 

Files are included based on the file path given or, if none is given, the include_path specified. If the file isn't found in the include_path, include() will finally check in the calling script's own directory and the current working directory before failing.

vars.php
<?php

$color = 'green';
$fruit = 'apple';

?>

test.php
<?php

echo "A $color $fruit"; // A

include 'vars.php';

echo "A $color $fruit"; // A green apple

?>


The require() function is identical to include(), except that it handles errors differently.

If an error occurs, the include() function generates a warning, but the script will continue execution. The require() generates a fatal error, and the script will stop.


<?php
// file and get, if you need to include a file.php?query_string.

function pinclude($file, $type, $get = null) {
$p = explode('/', $file);
$file = end($p);
$dir = '';
$n = count($p) - 1;

for($i = 0; $i < $n; $i++)
$dir .= $p[$i] . '/';

if($get !== null) {
$tmp = $_GET; // back up
$_GET = array();
$get = explode('&', $get);
$n = count($get);

for($i = 0; $i < $n; $i++) {
if(strpos($get[$i], '=') === false)
$_GET[$get[$i]] = 1;
else {
list($name, $val) = explode('=', $get[$i], 2);
$_GET[$name] = $val;
}
}
}

ob_start();
chdir($dir);
require $file;
$out = ob_get_clean();

if($tmp)
$_GET = $tmp;

return $out;
}

$out = pinclude('./dir/yourfile.php', 'a=b&c=d&e');
echo $out;
// i'm sorry but i forgot post requests...
?>

 

FWIW, I always use require_once(). This checks to be sure the file is not already included.

 

if the included/required file does not exist, require returns a fatal error while include returns a notice only.

fatal error will stop the whole script while notices will still continue to execute the script.