Replace ctype_digit() with is_numeric()
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@ -12,7 +12,7 @@ function getChunkCount()
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{
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if (
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!array_key_exists('ckSize', $_GET)
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|| !ctype_digit($_GET['ckSize'])
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|| !is_numeric($_GET['ckSize'])
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|| (int) $_GET['ckSize'] <= 0
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) {
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return 4;
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