With PHP, you can use call_user_func to call a function and use its parameters. The example below will demonstrate how it can be used with the str_replace() function. Under that, you will see how to use str_replace() to retrieve the same results.
In the first block, you will see that the function ‘str_replace’ is the first parameter, while the second, third and fourth parameters are those used by the str_replace function. So, if you use str_replace() on its own, your parameters are find, replace, from string while the call_user_func() is the function name, find, replace, from string.
$a = 'testin'; $replaced = call_user_func('str_replace', 'in', '', $a); echo $replaced . "\n"; $a = 'testin'; $replaced = str_replace("in", '', $a); echo $replaced . "\n";
Example #2
Here is a another example that uses a custom function called my_test(). Again, like the example above, it shows a tradition way to receive the desired results and the technique using call_user_func(). With this example, one variable is passed into the function and the same variable is returned with a new name. Finally, the variable is printed.
function my_test($input){ return $input; } $input = my_test('Bohemia'); echo $input . "\n"; $example = call_user_func('my_test', 'Bohemia'); echo $example . "\n";
Example #3
This example is similar to the one above, except that two parameters are into the function; one called ‘Bohemia2’ and the $example variable that was created from the previous example.
function my_test2($input, $second) { return $input . $second; } $input2 = my_test2('Bohemia2', $example); echo $input2 . "\n"; $example2 = call_user_func('my_test2', 'Bohemia2', $example); echo $example2 . "\n";
Output
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