render.php
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	<?php

	/*
	* Copyright 2011 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @group markup
	*/
	function phutil_render_tag($tag, array $attributes = array(), $content = null) {
	foreach ($attributes as $k => $v) {
	if ($v === null) {
	continue;
	}
	$v = phutil_escape_html($v);
	$attributes[$k] = ' '.$k.'="'.$v.'"';
	}

	$attributes = implode('', $attributes);

	if ($content === null) {
	return '<'.$tag.$attributes.' />';
	} else {
	return '<'.$tag.$attributes.'>'.$content.'</'.$tag.'>';
	}
	}

	/**
	* @group markup
	*/
	function phutil_escape_html($string) {
	return htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
	}

	function phutil_escape_uri($string) {
	return rawurlencode($string);
	}