PHP json_encode encoding numbers as strings

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Note that since PHP 5.3.3, there’s a flag for auto-converting numbers (the options parameter was added in PHP 5.3.0):

$arr = array( 'row_id' => '1', 'name' => 'George' );
echo json_encode( $arr, JSON_NUMERIC_CHECK ); // {"row_id":1,"name":"George"}

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