How a deprecated function can crash WordPress site while upgrading

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It is said that deprecated functions used in plugins & themes can crash a wordress website while upgrading to newer version, I want to see an example of deprecated function that can cause a crash.

Can someone show me an example?

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Many Thanks!

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  1. Where…

    The following files hold the deprecated functions:

    • ~/wp-includes/deprectated.php
    • ~/wp-includes/pluggable-deprectated.php
    • …

    Take a look at them and then through their replacement functions, where the calls to _deprecated_function() happen.

    Why…

    Normally a crash shouldn’t happen. In the “real” PHP world, you’d get an E_DEPRECATED Warning. In WordPress you’ll get a trigger_error() return caused by _deprecated_function() calls. The second trigger_error() argument isn’t used, so it defaults to E_USER_NOTICE and won’t stop your application from running.

    How to turn it off…

    You can turn this off either by using define( 'WP_DEBUG', false ); or by using a MU-Plugin that sets the filter to false:

    <?php
defined('ABSPATH') or exit;
/** Plugin Name: (#105686) Turn off deprecated Warnings */
add_filter( 'deprecated_function_trigger_error', '__return_false' );

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