convert dita general task to strict task

convertTask.php

<? php
/**
* Convert a DITA General Task to a Strict Task
* Backup your files
* Carefully review what this script is doing
* Expect manual post processing cleanup
* Be aware that it does change some IDs
*/

// Directory to read files from
$dir_read = "./user"; 
// Directory to write files to
$dir_write = "./new";
// Create the output directory if it doesn't exist
if( ! is_dir( $dir_write ) ) { 
	if( ! mkdir( $out, 0775 ) ) { 
		echo 'Cannot create '.$dir_write; 
		exit; 
	} 
}
// Read every file from $dir_read
foreach( glob( $dir_read.'/{*.xml,*.dita}', GLOB_BRACE ) as $dita ) { 
	// Read contents into string
	$contents = file_get_contents( $dita );
	// Is the file a generalTask?
	if( preg_match( '/generalTask.dtd/', $contents ) ) { 
		// Is the file valid XML?
		if( isXML( $contents ) ) { 
		    echo $dita."\n"; 
		    $contents = str_replace( '<!DOCTYPE task PUBLIC "-//OASIS//DTD DITA General Task//EN" "generalTask.dtd">', '<!DOCTYPE task PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">', $contents ); 
		    $contents = str_replace( 'steps-informal', 'steps-unordered', $contents ); 
		    $contents = preg_replace( '/<li(.*?)>/', '<step ${1}><cmd>', $contents ); 
		    $contents = str_replace( '</li>', '</cmd></step>', $contents ); 
		    $contents = preg_replace( '/<ul(.*?)>/', '', $contents ); 
		    $contents = preg_replace( '/<\/ul(.*?)>/', '', $contents );
		    if( preg_match( '/<ol(.*?)>/', $contents ) ) { 
		        $contents = str_replace( 'steps-unordered', 'steps', $contents ); 
		        $contents = preg_replace( '/<ol(.*?)>/', '', $contents ); 
		        $contents = preg_replace( '/<\/ol(.*?)>/', '', $contents ); 
		    }
		    // Pull non-steps out and stick them in context before the first step
		    $contents = preg_replace( '/\<steps(.*?)\>(.*?)\<step/s', '<context>${2}</context><steps ${1}><step', $contents );
		    // Pull figures out of cmd, then stick them after cmd inside stepxmp
		    $contents = preg_replace( '/\<cmd(.*?)\<fig(.*?)\<\/cmd\>/s', '<cmd ${1}</cmd><stepxmp><fig ${2}</stepxmp>', $contents );
		    // Pull notes out of cmd, then stick them after step inside info which is inside the step
		    $contents = preg_replace( '/\<cmd(.*?)\<note(.*?)\<\/cmd>(.*?)\<\/step\>/s', '<cmd ${1}</cmd><info><note${2}</info></step>', $contents );
		    $fp = fopen( $dir_write.DIRECTORY_SEPARATOR.basename( $dita ), 'w' ); 
		    fwrite( $fp, $contents ); 
		    fclose( $fp );
		} 
	} 
}
function isXML( $xml ) { 
    libxml_use_internal_errors( true );
    $doc = new DOMDocument( '1.0', 'utf-8' ); 
    $doc -> loadXML( $xml );
    $errors = libxml_get_errors( );
    if( empty( $errors ) ) { 
        return true; 
    }
    $error = $errors [ 0 ]; 
    if( $error -> level < 3 ) { 
        return true; 
    }
    $explodedxml = explode( "r", $xml ); 
    $badxml = $explodedxml [( $error -> line )- 1 ];
    $message = $error -> message.' at line '.$error -> line.'. Bad XML: '.htmlentities( $badxml ); 
    return $message; 
}