Why is this preg_split not working as I want it to?

I have a preg_split pattern as below:

$pattern = '/[, ;:-_.|+#\/]/';

I use

$pcs = preg_split($pattern, $string);

if string is " Hello how are you", then count($pcs) == 5.

if string is "Hello how are you", then count($pcs) == 4.

if string is " Hello how are you ", then count($pcs) == 6.

Does anybody know what the problem is? (I want it to return 4 i开发者_如何学JAVAn all above cases).

My plan is to split a user-inputted string into words simply. The string entered may contain the characters in the pattern above.

Thanks

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Try

$pcs = preg_split($pattern, $string, -1, PREG_SPLIT_NO_EMPTY);

Read more in the manual: http://php.net/manual/en/function.preg-split.php

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Look at your whitespace. I am going to assume the following:

• "Hello how are you" split results has $pcs[0] == ''
• "Hello how are you " split results has $pcs[0] == '' and $pcs[5] == ''

Since there is white space at the beginning and/or end (depending on the case) your preg_split is going to still create the split between nothing and the first and/or last word. If you want to avoid this you should run a trim() first before your split.