PHP-General - Problrm with loop when use sleep function

[mojtabaesf]

when i run this script in local my PC is OK . but when run the same script on server is strange and my loop run more than 32 .
PHP Code:
<?php
for ( $i = 0 ; $i < 32 ; $i++ )
{
$b = $i * 80 ;
$l = $b + 80 ;
for ( $c = $b ; $c < $l ; $c++ )
{
$s = $c + 1 ;
$array [] = $s ;
}
sleep (13);
$f = fopen("db.txt" , 'a+') ;
$z = $i + 1 ;
fwrite ($f , '(('.$z.'))-->>[[' );
foreach ( $array as $val )
{
fwrite ($f , $val.' ' );
}
fwrite ($f,"]]\n\n" );
$array = array();
}
?>


help me please