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<?php
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function tag($tag, $content = null, array $attributes = null) {
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   $out = '<' . $tag;
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   if ($attributes !== null) {
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     foreach($attributes AS $key => $val) {
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       $out .= ' ' . $key . '="' . $val . '"';
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     }
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   }
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   if ($content === null) {
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      return $out . ' />';
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   }
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   return $out . '>' . $content . '</' . $tag . '>';
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}
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}
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tag('h1', 'Header', array('class' => 'h1', 'id' => 'h1', 'style' => 'text-align:center;'));