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12 years ago
As I intended to create for my own purpose a clean PHP class to act on XML files, combining the use of DOM and simplexml functions, I had that small problem, but very annoying, that the offsets in a path is not numbered the same in both. 



That is to say, for example, if i get a DOM xpath object it appears like:

/ANODE/ANOTHERNODE/SOMENODE[9]/NODE[2]

and as a simplexml object would be equivalent to:

ANODE->ANOTHERNODE->SOMENODE[8]->NODE[1]



So u see what I mean? I used preg_match_all to solve that problem, and finally I got this after some hours of headlock (as I'm french the names of variables are in French sorry), hoping it could be useful to some of you:



<?php

function decrease_string($string)

    {

        /* retrieve all occurrences AND offsets of numbers in the original string: */



        preg_match_all("/[0-9]+/",$chaine,$out,PREG_OFFSET_CAPTURE);

            for($i=0;$i<sizeof($out[0]);$i++)

            {

                $longueurnombre = strlen((string)$out[0][$i][0]);

                $taillechaine = strlen($chaine);

                // cut the string in 3 pieces

                $debut = substr($chaine,0,$out[0][$i][1]);

                $milieu = ($out[0][$i][0])-1;

                $fin = substr($chaine,$out[0][$i][1]+$longueurnombre,$taillechaine);

                 /* if it's 10,100,1000, the problem is that the string gets shorter and it shifts all the offsets, so we have to decrease them of 1 */

                 if(preg_match('#[1][0]+$#', $out[0][$i][0]))

                 {

                    for($j = $i+1;$j<sizeof($out[0]);$j++)

                    {

                        $out[0][$j][1] = $out[0][$j][1] -1;

                    }

                 }

                $chaine = $debut.$milieu.$fin;

            }

        return $chaine;

    }

?>
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