__return_zero()
Simply returns 0. Helper function of WordPress. Useful for use in filters.
All such helper functions:
__return_false() — returns false.
__return_true() — returns true.
__return_empty_array() — returns an empty: array().
__return_zero() — returns the number 0.
__return_null() — returns NULL.
__return_empty_string() — returns an empty string: ''.
This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.
1 time — 0.000001 sec (speed of light) | 50000 times — 0.00 sec (speed of light) | PHP 7.1.11, WP 4.9.7
No Hooks.
Return
Int. 0.
Usage
__return_zero() // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore;
Examples
#1 Example of how to use function
Suppose we need return 0 in filter example_filter. Use this code:
add_filter( 'my_filter', '__return_zero' );
The same can be written in a different way:
// anonymous function (php 5.3+)
add_filter( 'my_filter', function(){ return 0; } );
// or so, with function registration
add_filter( 'my_filter', 'my_return_function' );
function my_return_function(){
return 0;
}
Changelog
| Since 3.0.0 | Introduced. |
Code of __return_zero() return zero WP 5.9.3
function __return_zero() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
return 0;
}