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How does one enable error logging in PHP ?

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You can do this at runtime with the ini_set() command at the top of your PHP script, or you can change the setting permanently from within the php.ini file. Via runtime, you would do it as so:

ini_set('log_errors', 1);

Then, as copied from https://www.php.net/manual/en/function.error-reporting.php

<?php

// Turn off all error reporting
error_reporting(0);

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);

// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);

// Report all errors except E_NOTICE
error_reporting(E_ALL & ~E_NOTICE);

// Report all PHP errors
error_reporting(E_ALL);

// Report all PHP errors
error_reporting(-1);

// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);

?>
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