PHP: How can I remove from String the last word?

Question

How can I remove, with PHP, the last word from a String?

For example the string \"Hi, I\'m Gian Marco\" would become \"Hi, I\'m Gian\".

Answer 1

The current solution is ok if you do not know the last word and the string length is short.

In case you do know it, for instance when looping a concat string for a query like this:

        foreach ($this->id as $key => $id) {
            $sql.=' id =' . $id . ' OR ';
        }

A better solution:

        $sql_chain = chop($sql_chain," OR ");

Be aware that preg_replace with a regex is VERY slow with long strings. Chop is 100 times faster in such case and perf gain can be substantial.