If I understand your question correctly, you can try the following:
add_filter( 'the_content', 'incrementparagraphs', 10, 1 );
function incrementparagraphs( $content )
{
return preg_replace_callback(
'|<p>|',
function ( $matches )
{
static $i = 0;
return sprintf( '<p data-section-id="%d">', $i++ );
},
$content
);
}
to replace every <p> tags with <p data-section-id="1">, where the data-section-id attribute contains the incremental count of the current p tag.
Example:
Before:
<p>aaa</p>
<p>bbb</p>
<p>ccc</p>
After:
<p data-section-id="0">aaa</p>
<p data-section-id="1">bbb</p>
<p data-section-id="2">ccc</p>
More on preg_replace_callback here.
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