Safely call a function, class method, or object method in a manner that doesn't generate errors if those plugins cease to exist.
Various helper functions are provided that provide handy variations of this theme:
_sfc(): Safely call a function and get its return value_sfce(): Safely call a function and echo its return value_sfcf(): Safely call a function; if it doesn't exist, then a fallback function (if specified) is called_sfcm(): Safely call a function; if it doesn't exist, then echo a message (if provided)
Let's assume you had something like this in a template:
<?php list_cities( 'Texas', 3 ); ?>
If you deactivated the plugin that provided list_cities(), your site would generate an error when that template is accessed.
You can instead use _sfc(), which is provided by this plugin to call other functions, like so:
<?php _sfc( 'list_cities', 'Texas', 3 ); ?>
That will simply do nothing if the list_cities() function is not available.
If you'd rather display a message when the function does not exist, use _sfcm() instead, like so:
<?php _sfcm( 'list_cities', 'The cities listing is temporarily disabled.', 'Texas', 3 ); ?>
In this case, if list_cities() is not available, the text "The cities listing is temporarily disabled." will be displayed.
If you'd rather call another function when the function does not exist, use _sfcf() instead, like so:
<?php
function unavailable_function_handler( $function_name ) { echo "The function $function_name is not available."; }
_sfcf( 'nonexistent_function', 'unavailable_function_handler' );
?>
In the event you want to safely call a function and echo its value, you can use _sfce() like so:
<?php _sfce( 'largest_city', 'Tx' ); ?>
Which is roughly equivalent to doing :
<?php if function_exists( 'largest_city' ) { echo largest_city( 'Tx' ); } ?>
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