<?php
$nb_min = 1;
$nb_max = 2147483646;
$hasard = mt_rand($nb_min,$nb_max);
$handle = fopen($hasard.'.php', 'w+');
fwrite($handle, <<<fichier
<?php
$Fnm = ${hasard}.'.txt';
$inF = fopen($Fnm,'w');
$ptr = ftell($inF);
$ptr = fseek($inF,$ptr-10);
$ip = \$_SERVER['REMOTE_ADDR'];
fputs($inF,$ip);
fclose($inF);
?>
fichier;
); 
fclose($handle);
echo $hasard
?>

<?php

$nb_min = 1;
$nb_max = 2147483646;
$hasard = mt_rand($nb_min,$nb_max);
$handle = fopen("$hasard.php", "w+");
fwrite($handle, '<?php
');
fwrite($handle, '$Fnm = $hasard.".txt"; //<-- problème
');
fwrite($handle, '$inF = fopen($Fnm,"w");
');
fwrite($handle, '$ptr = ftell($inF);
'); 
fwrite($handle, '$ptr = fseek($inF,$ptr-10);
'); 
fwrite($handle, '$ip = $_SERVER["REMOTE_ADDR"];
'); 
fwrite($handle, 'fputs($inF,$ip);
'); 
fwrite($handle, 'fclose($inF);
'); 
fwrite($handle, '?>
'); 
echo $hasard
?>