Separate space-delimited words in a string [duplicate]

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The easiest would be to use explode:

$words = explode(' ', $str);

But that does only accept fixed separators. split an preg_split do accept regular expressions so that your words can be separated by multiple spaces:

$words = split('\s+', $str);
// or
$words = preg_split('/\s+/', $str);

Now you can additionally remove leading and trailing spaces with trim:

$words = preg_split('/\s+/', trim($str));

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