How to display PHP errors at runtime with a simple code

Many servers do not display PHP errors by default, so many times when not getting the expected result or performance we don´t know which line of code is giving error.

With the following functions placed at the beginning of our PHP files we will show the PHP errors:

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
?>

Additionally I put more example code to show or not to display the errors of PHP:

<?php
// Show all PHP errors
error_reporting(-1);

// Do not show PHP errors
error_reporting(0);

// Show all PHP errors
error_reporting(E_ALL);

// Show all PHP errors
ini_set('error_reporting', E_ALL);
?>