Sample Code

class GuitarTabs

Purpose: A class that produces a menu of guitar tabs contained within a specified directory, and outputs the guitar tab based on user selections.

This class is an example of the division of component operation into a control phase where input is gathered and processed, and a view phase and a view phase where output is produced based on the state of the class

<?php class GuitarTabs { var $arrTabs; var $sDir; var $sCurrTab; var $sCurrID; function GuitarTabs($tab_path) { $this->sDir = $tab_path; $this->sCurrID = -1; $this->sCurrTab = ""; $this->arrTabs = array(); } function Control() { $this->LoadTabList(); if(array_key_exists(intval($_REQUEST['tab_id']), $this->arrTabs)) { $this->sCurrID = intval($_REQUEST['tab_id']); $this->LoadTab($this->sCurrID); } } function ViewMenu() { echo $this->ListTabs(); } function ViewTabName() { if( array_key_exists($this->sCurrID, $this->arrTabs) ) { echo $this->FormatFilename($this->arrTabs[$this->sCurrID]); } else { echo "None Selected"; } } function ViewTab() { echo "<pre>"; echo $this->sCurrTab; echo "</pre>"; } function LoadTab($tab_id = 0) { $dataFile = fopen( $this->arrTabs[$tab_id], "r" ) ; if ( $dataFile ) { $this->sCurrTab = ""; while (!feof($dataFile)) { $buffer = fgets($dataFile, 4096); $this->sCurrTab .= $buffer; } fclose($dataFile); } else { die( "fopen failed for $filename" ) ; } } function LoadTabList() { $files = $this->searchdir($this->sDir, -1, "FILES", 0); foreach($files as $tab) { //filter out bad files if($tab != $this->sDir) { $this->arrTabs[] = $tab; } } } //return a block of html with an unordered list of links function ListTabs() { $html = "<ul>"; foreach($this->arrTabs as $key => $tab) { $query_string = "?display=" . urlencode($filename); $html .= '<li>'; // $html .= '<form name="frm' . $key . '" method="post" action="' . $_SERVER['PHP_SELF'] . '">'; // $html .= '<input type="hidden" name="tab_id" value="' . $key . '">'; if( $key == $this->sCurrID ) { $html .= '<strong>' . $this->FormatFilename($tab) . '</strong>'; } else { $html .= '<a href="' . $_SERVER['PHP_SELF'] . "?tab_id=" . $key . '">' . $this->FormatFilename($tab) . '</a>'; } $html .= '</li>'; } $html .= "</ul>"; return $html; } function FormatFilename($filename) { return str_replace($this->sDir, "", $filename); $filename; } //return an array of the files contained int the directory function searchdir ( $path , $maxdepth = -1 , $mode = "FULL" , $d = 0 ) { if ( substr ( $path , strlen ( $path ) - 1 ) != '/' ) { $path .= '/' ; } $dirlist = array () ; if ( $mode != "FILES" ) { $dirlist[] = $path ; } if ( $handle = opendir ( $path ) ) { while ( false !== ( $file = readdir ( $handle ) ) ) { if ( $file != '.' && $file != '..' ) { $file = $path . $file ; if ( ! is_dir ( $file ) ) { if ( $mode != "DIRS" ) { $dirlist[] = $file ; } } elseif ( $d >=0 && ($d < $maxdepth || $maxdepth < 0) ) { $result = searchdir ( $file . '/' , $maxdepth , $mode , $d + 1 ) ; $dirlist = array_merge ( $dirlist , $result ) ; } } } closedir ( $handle ) ; } if ( $d == 0 ) { natcasesort ( $dirlist ) ; } return ( $dirlist ) ; } } ?>

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