WordPress: Functions to fetch one liner content from post_content

get_singe_line.php

<?php

if ( ! function_exists( 'twr_get_progressive_line') ) {
    /**
     * Returns proper line string from given $string content by progressively matching each line of the given html blob
     * @param  string  $content    
     * @param  integer $nth_line nth line to scan of given string
     * @param  integer $scanned_chars characters scanned
     * @return mixed|null|string
     */
    function twr_get_progressive_line( $content, $nth_line=1, $scanned_chars=0 ) {
        
        $line_end_pos = twr_strpos( $content, PHP_EOL, $nth_line );
        if ( false == $line_end_pos ) {
            return NULL;
        }
        $excerpt_limit_pos = $scanned_chars + 100; // 100 is excerpt_limit_offset,
        // if currently scanned line is greater than excerpt limit then return
        if ( $line_end_pos > $excerpt_limit_pos ) {
            return strip_tags( substr( $content, 0, $line_end_pos ) );
        } else {
            $nth_line++;
            return twr_get_progressive_line( $content, $nth_line, $line_end_pos );
        }
    }
}
if ( ! function_exists( 'twr_strpos' ) ) {
    /**
     *
     * finds position of nth occurance of search string
     *
     * @param string $needle string being searched
     * @param string $haystack 
     * @param int $offset nth occurance of needle
     *
     * @return int or false if not found
     *
     */
    function twr_strpos( $haystack, $needle, $offset ) {
        
        $arr = explode( $needle, $haystack );
        switch( $offset ) {
            case $offset == 0:
                return false;
            break;
        
            case $offset > max( array_keys( $arr ) ):
                return false;
            break;
            default:
            return strlen( implode( $needle, array_slice( $arr, 0, $offset ) ) );
        }
    }
}