Custom PHP string intercept function

Custom PHP string intercept function <> function Get_substr ($string, $start = ' 0 ', $length = ') { $start = (int) $start; $length = (int) $length; $i = 0; if (! $string) { Return } if ($start >=0) { while ($i < $start) { if (Ord ($string [$i]) >127) { $i = $i +2; } Else { $i + +; } } $start = $i; if ($length = = ") { Return substr ($string, $start); } ElseIf ($length >0) { $end = $start + $length; while ($i < $end) { if (Ord ($string [$i]) >127) { $i = $i +2; } Else { $i + +; } } if ($end! = $i-1) { $end = $i; } Else { $end--; } $length = $end-$start; Return substr ($string, $start, $length); } ElseIf ($length ==0) { Return } Else { $length = strlen ($string)-abs ($length)-$start; Return Get_substr ($string, $start, $length); } } Else { $start = strlen ($string)-abs ($start); Return Get_substr ($string, $start, $length); } } ?> Copy Code

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