PHP Manual: Provide a return value for an existing function

Description

bool uopz_set_return(string $function, mixed $value, bool $execute = false)

bool uopz_set_return(
    string $class,
    string $function,
    mixed $value,
    bool $execute = false
)

Sets the return value of the function to value. If value is a Closure and execute is set, the Closure will be executed in place of the original function. It is possible to call the original function from the Closure.

Note:
This function replaces uopz_rename.

Parameters

class: The name of the class containing the function
function: The name of an existing function
value: The value the function should return. If a Closure is provided and the execute flag is set, the Closure will be executed in place of the original function.
execute: If true, and a Closure was provided as the value, the Closure will be executed in place of the original function.

Return Values

True if succeeded, false otherwise.

Examples

Example #1 uopz_set_return example

<?php
uopz_set_return("strlen", 42);
echo strlen("Banana");
?>

The above example will output:

Example #2 uopz_set_return example

<?php
uopz_set_return("strlen", function($str) { return strlen($str) * 2; }, true );
echo strlen("Banana");
?>

The above example will output:

Example #3 uopz_set_return class example

<?php
class My {
    public static function strlen($arg) {
        return strlen($arg);
    }
}
uopz_set_return(My::class, "strlen", function($str) { return strlen($str) * 2; }, true );
echo My::strlen("Banana");
?>

The above example will output: