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(PHP 4, PHP 5, PHP 7, PHP 8)

require is identical to include except upon failure it will also produce a fatal E_COMPILE_ERROR level error. In other words, it will halt the script whereas include only emits a warning (E_WARNING) which allows the script to continue.

See the include documentation for how this works.

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User Contributed Notes 3 notes

chris at chrisstockton dot org
17 years ago
Remember, when using require that it is a statement, not a function. It's not necessary to write:

The following:
require 'somefile.php';

Is preferred, it will prevent your peers from giving you a hard time and a trivial conversation about what require really is.
Marcel Baur
2 years ago
If your included file returns a value, you can get it as a result from require(), i.e.

return "foo";

$bar = require("foo.php");
echo $bar; // equals to "foo"
jave dot web at seznam dot cz
6 months ago
Always use __DIR__ to define path relative to your current __FILE__.
(Or another setting that is originally based on __DIR__/__FILE__)

try & catch - don't get confused by the words "fatal E_COMPILE_ERROR" - it's still just an internal Error that implements Throwable - it can be caught:

try {
__DIR__ . '/something_that_does_not_exist');
} catch (
\Throwable $e) {
"This was caught: " . $e->getMessage();
" End of script.";

Note that this will still emit a warning "Failed to open stream: No such file or directory..." ...unless you prefix the require with "@" - which I strongly don't recommend as it would ignore/supress any diagnostic error (unless you have specified set_error_handler()). But even if you'd prefix the require with "@" it would still be caught.
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