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<?php
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$str = 'abcdefgh';
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$n = 2;
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$m = 3;
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echo substr($str, $n, $m), "\n"; //cde
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echo substr($str, $n), "\n"; //cdefgh
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echo substr($str, 0, -1), "\n"; //abcdefg
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echo substr($str, strpos($str, 'd'), $m), "\n"; //def
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echo substr($str, strpos($str, 'de'), $m), "\n"; //def
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?>
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