Code Duplication    Length = 11-11 lines in 2 locations

src/Datium.php 2 locations

@@ 333-343 (lines=11) @@
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   *
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   * @return object
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   */
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    public function add($value)
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    {
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        $this->date_interval_expression = str_replace(
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            $this->config[ 'date_simple' ],
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            $this->config[ 'date_interval' ],
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            $value
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        );
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        $this->date_interval_expression = str_replace(
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            ' ',
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            '',
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            'P' . $this->date_interval_expression
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        );
@@ 363-373 (lines=11) @@
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   *
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   * @return obejct
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   */
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    public function sub($value)
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    {
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        $this->date_interval_expression = str_replace(
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            $this->config[ 'date_simple' ],
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            $this->config[ 'date_interval' ],
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            $value
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        );
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        $this->date_interval_expression = str_replace(
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            ' ',
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            '',
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            'P' . $this->date_interval_expression
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        );