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Using rename_function () in PHP (not working)

Perhaps I do not understand the rename_function () function ; or uses it correctly.

Here are my first experiments with this feature:

<?php

rename_function('count', 'contar');

$var = array(
    "one",
    "two",
    "three"
    );

$number = contar($var);
echo $number;

?>

As you can see here , it does not work

When I use it in MAMP Chrome gives me this error:

Server error.

An error occurred while receiving the website http://localhost:8888/translate.php. It may be unavailable for maintenance or incorrectly configured.

Any ideas why this could be?

Thanks in advance!

By the way: sorry if this is an absolute basic question, but I can't figure it out!

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2 answers

APD PHP.

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