Error generating PHP barcode

Question

Well, my problem is this::

I have the digit line and I want to turn it into barcode.

You must be thinking: "our this is quite simple using some ready classes you have on the web!".

Yes, I have tested several models and when reading the generated barcode is interpreted with other numbers. At first it looks the same, but in certain parts of the code it changes, but I have no idea why.

Anyone who can help me, I would be very grateful. I really need to solve this problem.

EXAMPLE:

Digitable line for conversion:

846100000005919402962014711150030007003147180834

What is generating:

846100000005591940296203147111500301007003147183

<?php
function geraCodigoBarra($numero){
    $fino = 1;
    $largo = 3;
    $altura = 50;

    $barcodes[0] = '00110';
    $barcodes[1] = '10001';
    $barcodes[2] = '01001';
    $barcodes[3] = '11000';
    $barcodes[4] = '00101';
    $barcodes[5] = '10100';
    $barcodes[6] = '01100';
    $barcodes[7] = '00011';
    $barcodes[8] = '10010';
    $barcodes[9] = '01010';

    for($f1 = 9; $f1 >= 0; $f1--){
        for($f2 = 9; $f2 >= 0; $f2--){
            $f = ($f1*10)+$f2;
            $texto = '';
            for($i = 1; $i < 6; $i++){
                $texto .= substr($barcodes[$f1], ($i-1), 1).substr($barcodes[$f2] ,($i-1), 1);
            }
            $barcodes[$f] = $texto;
        }
    }

    echo '<img src="imagens/p.gif" width="'.$fino.'" height="'.$altura.'" border="0" />';
    echo '<img src="imagens/b.gif" width="'.$fino.'" height="'.$altura.'" border="0" />';
    echo '<img src="imagens/p.gif" width="'.$fino.'" height="'.$altura.'" border="0" />';
    echo '<img src="imagens/b.gif" width="'.$fino.'" height="'.$altura.'" border="0" />';

    echo '<img ';

    $texto = $numero;

    if((strlen($texto) % 2) <> 0){
        $texto = '0'.$texto;
    }

    while(strlen($texto) > 0){
        $i = round(substr($texto, 0, 2));
        $texto = substr($texto, strlen($texto)-(strlen($texto)-2), (strlen($texto)-2));

        if(isset($barcodes[$i])){
            $f = $barcodes[$i];
        }

        for($i = 1; $i < 11; $i+=2){
            if(substr($f, ($i-1), 1) == '0'){
                $f1 = $fino ;
            }else{
                $f1 = $largo ;
            }

            echo 'src="imagens/p.gif" width="'.$f1.'" height="'.$altura.'" border="0">';
            echo '<img ';

            if(substr($f, $i, 1) == '0'){
                $f2 = $fino ;
            }else{
                $f2 = $largo ;
            }

            echo 'src="imagens/b.gif" width="'.$f2.'" height="'.$altura.'" border="0">';
            echo '<img ';
        }
    }
    echo 'src="imagens/p.gif" width="'.$largo.'" height="'.$altura.'" border="0" />';
    echo '<img src="imagens/b.gif" width="'.$fino.'" height="'.$altura.'" border="0" />';
    echo '<img src="imagens/p.gif" width="1" height="'.$altura.'" border="0" />';
}

geraCodigoBarra('846100000005919402962014711150030007003147180834');
?>