recursive substr()

[vronsky]

Hi community,
this time I have to split a file in substrings, then insert them into a database.
Supposing I have a 40 bytes file (can be 50,60 etc... always a multiple of 10), I would like to correcly divide it into substrings of
10 bytes, that is my record trace. Then I'll split that string again
obtaining the records to insert in mysql.

The code :

$filename = "my_file.txt";
$filesize = filesize($filename);
$fd = fopen ($filename, "rb");
$contents = fread ($fd, $filesize);
$str_len= strlen($contents);
$record_length = 10 ;
$my_records = $str_len/$record_length ;
for($u=0; $u < $my_records ; $u++){
     $init_sub = $u * ($record_length + 1);
     if ($u > 1) { $init_sub = ($u * $record_length) + 1;}
     $end_sub = ($u +1) * $record_length ;
     $my_record_string = substr($contents, $init_sub, $end_sub);
     $my_record_string_length = strlen($my_record_string);//must be = $record_length,but it is not so....
} 

where are the mistakes?
thanks again....

[drew010]

for debugging i changed the code slightly and mode only one or two modifications to the substr code. it seems to be working now for me.

<?php

$contents = "abdigekddd,,gkdjeigndjeighwuqkdngeuslgntrrlshngie[64512684637745235489";


//$filename = "my_file.txt";
//$filesize = filesize($filename);
//$fd = fopen ($filename, "rb");
//$contents = fread ($fd, $filesize);
$str_len= strlen($contents);
$record_length = 10 ;
$my_records = $str_len/$record_length ;
for($u=0; $u < $my_records ; $u++){
     $init_sub = $u * ($record_length);
     if ($u > 1) { $init_sub = ($u * $record_length);}
     $end_sub = $record_length ;
     $my_record_string = substr($contents, $init_sub, $end_sub);
     $my_record_string_length = strlen($my_record_string);//must be = $record_length,but it is not so....
     echo $my_record_string . "\n";
}

?>

given the contents in that variable, the output was:
abdigekddd
,,gkdjeign
djeighwuqk
dngeuslgnt
rrlshngie[
6451268463
7745235489

ech line 10 chars, from start of the string to the end

[vronsky]

Uhmm... it look like it do work.....

thank you very much drew.....