split a string.

let's see the zend mock exam question related to splitting a string in php.

Question: Which of the following is the best way to split a string on the "-=-" pattern?

Answer:

1. They all are equally proper methods
2. str_split($string, strpos($string, "-=-"))
3. preg_split("-=-", $string);
4. explode("-=-" $string);
it doesn't have a ','.
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