Cleaner substring syntax
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@ -236,7 +236,7 @@ class Index implements RequestHandlerInterface
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$fields = explode(',', $string);
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$fields = explode(',', $string);
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foreach ($fields as $field) {
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foreach ($fields as $field) {
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if (substr($field, 0, 1) === '-') {
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if ($field[0] === '-') {
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$field = substr($field, 1);
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$field = substr($field, 1);
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$direction = 'desc';
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$direction = 'desc';
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} else {
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} else {
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