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$split = preg_split('/[\s]+/',$datarow);


What does '/[\s]+/' mean? [\s] represents any whitespace character, '+' represents the whitespace character should be followed by something. But what do the two '\' mean?

Edited by dw_user because: grammatical correction
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AFAIK, it means

at least one whitespace character.
the / at the start and end are your pattern delimiters. They have to be present for every pattern.

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