Include Functions PHP -

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i have php file include functions , css page. trying make include function generate of html. can not figure out how css file in php include function made. 

<?phpe     function htmlstart( $title)     {         echo "<!doctype html>\n";         echo "<html>\n";         echo "<head>\n";         echo "      <title>".$title."</title>\n";         echo "      <link href=\ 'inclab.css' type=\"text/css\" rel=\"stylesheet\" />\n";         echo "</head>\n";         echo "<body>\n";     } ?>

the problem have echo line:

echo "      <link href=\ 'inclab.css' type=\"text/css\" rel=\"stylesheet\" />\n";

i tried use double quotes , error, tried use single quotes "inclab.css , got no error. wounding if right way it.

also, made navigation bar in include file how put in class (for css) links line correctly. 

<?php     function pagenagivation()     {         echo "<!-- nav of page --> \n";         echo "<nav> \n";         echo       '<div class="nav-item float-left"> <a href="inclabpage1.php">page 1</a>';         echo       '<div class="nav-item end-float"> <a href="inclabpage2.php">page 2</a>';         echo "</nav> \n";     } ?>

the navigation bar works , display not display correctly. problem know lies <div class.... part of code. how work. thanks.

for quote problem, yes acceptable use single quotes in situation, that's for. escaping 1 of them, don't need do:

echo "<link href='inclab.css' type='text/css' rel='stylesheet' />\n";

for adding class, can input html like:

echo '<div class="nav-item end-float myclass"> <a href="inclabpage2.php">page 2</a>';

or, if stored in variable:

echo '<div class="nav-item end-float '.$myclass.'"> <a href="inclabpage2.php">page 2</a>';

or

echo '<div class="nav-item end-float $myclass"> <a href="inclabpage2.php">page 2</a>';

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