<?php
    show_source(__FILE__);
    /*PHP program to:
        1. Read text content from a text file with simple pseudo tags marking the content type
           PG: paragraph
           Hn: heading at level n
        2. Content is read into an array with each line an element in the array from 0..lastLine
        3. HTML page template is saved in a html sub-folder with a placeholder [+content+]
        4. HTML page template read and assigned to a string variable $html
        5. The content array is iterated over, reading the pseudo content codes to produce associated HTML coding
        6. The created HTML coding replaces the [+content+] placeholder in the HTML template string.
        7. The completed HTML template string is echo'd to the browser.
    */
    $html = '';
    #read the text content from file into an array
    $contentFile = 'content/content.txt';
    if (file_exists($contentFile)) {
        $contentLinesArray = file($contentFile);
    } else {
        echo "ERROR - file not found: $contentFile";
    }
    #Display how the content read from file looks in the array
    echo '<pre>File Contents read into a PHP array:';
    print_r($contentLinesArray);
    echo '</pre>';
    
    $HTMLtemplate = 'html/home.html';
    if (file_exists($HTMLtemplate)) { #get the HTML page template
        $html .= file_get_contents($HTMLtemplate);
        $content = ''; #intitalise a content variable to hold HTMl content as it is being created
        #iterate over the $contentLinesArray reading the pseudo content codes producing matching HTML element markup
        foreach($contentLinesArray as $line) {
            $lineContentType = substr($line,0,3); #get the content code in first 3 chars of line
            $lineContent = substr($line,3);       #get the content matching the code in rest of the line
            switch ($lineContentType) {
                case 'H1:' : #match 3 possible heading content codes
                case 'H2:' :
                case 'H3:' :
                    $headingLevel = substr($lineContentType,1,1); #get the heading level
                    $htmlTag = "h$headingLevel"; #create HTML heading element code
                    break;
                case 'PG:' : #match the paragraph content code
                    $htmlTag = 'p'; #create HTML paragraph element code
            }
            #add the created HTML line element coding to content
            $content .= "<$htmlTag>$lineContent</$htmlTag>"; 
        }
    } else {
        echo "ERROR - file not found: $HTMLtemplate";
    }
    #replace the placeholder in the HTML template file with the created HTML elements from the content file
    echo str_replace('[+content+]',$content,$html); 
?>

File Contents read into a PHP array: